/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Directive, ElementRef, inject, InjectionToken, Injector, Input, NgZone, PLATFORM_ID, Renderer2, ɵformatRuntimeError as formatRuntimeError, ɵRuntimeError as RuntimeError } from '@angular/core';
import { isPlatformServer } from '../../platform_id';
import { imgDirectiveDetails } from './error_helper';
import { cloudinaryLoaderInfo } from './image_loaders/cloudinary_loader';
import { IMAGE_LOADER, noopImageLoader } from './image_loaders/image_loader';
import { imageKitLoaderInfo } from './image_loaders/imagekit_loader';
import { imgixLoaderInfo } from './image_loaders/imgix_loader';
import { LCPImageObserver } from './lcp_image_observer';
import { PreconnectLinkChecker } from './preconnect_link_checker';
import { PreloadLinkCreator } from './preload-link-creator';
import * as i0 from "@angular/core";
/**
 * When a Base64-encoded image is passed as an input to the `NgOptimizedImage` directive,
 * an error is thrown. The image content (as a string) might be very long, thus making
 * it hard to read an error message if the entire string is included. This const defines
 * the number of characters that should be included into the error message. The rest
 * of the content is truncated.
 */
const BASE64_IMG_MAX_LENGTH_IN_ERROR = 50;
/**
 * RegExpr to determine whether a src in a srcset is using width descriptors.
 * Should match something like: "100w, 200w".
 */
const VALID_WIDTH_DESCRIPTOR_SRCSET = /^((\s*\d+w\s*(,|$)){1,})$/;
/**
 * RegExpr to determine whether a src in a srcset is using density descriptors.
 * Should match something like: "1x, 2x, 50x". Also supports decimals like "1.5x, 1.50x".
 */
const VALID_DENSITY_DESCRIPTOR_SRCSET = /^((\s*\d+(\.\d+)?x\s*(,|$)){1,})$/;
/**
 * Srcset values with a density descriptor higher than this value will actively
 * throw an error. Such densities are not permitted as they cause image sizes
 * to be unreasonably large and slow down LCP.
 */
export const ABSOLUTE_SRCSET_DENSITY_CAP = 3;
/**
 * Used only in error message text to communicate best practices, as we will
 * only throw based on the slightly more conservative ABSOLUTE_SRCSET_DENSITY_CAP.
 */
export const RECOMMENDED_SRCSET_DENSITY_CAP = 2;
/**
 * Used in generating automatic density-based srcsets
 */
const DENSITY_SRCSET_MULTIPLIERS = [1, 2];
/**
 * Used to determine which breakpoints to use on full-width images
 */
const VIEWPORT_BREAKPOINT_CUTOFF = 640;
/**
 * Used to determine whether two aspect ratios are similar in value.
 */
const ASPECT_RATIO_TOLERANCE = .1;
/**
 * Used to determine whether the image has been requested at an overly
 * large size compared to the actual rendered image size (after taking
 * into account a typical device pixel ratio). In pixels.
 */
const OVERSIZED_IMAGE_TOLERANCE = 1000;
/**
 * Used to limit automatic srcset generation of very large sources for
 * fixed-size images. In pixels.
 */
const FIXED_SRCSET_WIDTH_LIMIT = 1920;
const FIXED_SRCSET_HEIGHT_LIMIT = 1080;
/** Info about built-in loaders we can test for. */
export const BUILT_IN_LOADERS = [imgixLoaderInfo, imageKitLoaderInfo, cloudinaryLoaderInfo];
const defaultConfig = {
    breakpoints: [16, 32, 48, 64, 96, 128, 256, 384, 640, 750, 828, 1080, 1200, 1920, 2048, 3840],
};
/**
 * Injection token that configures the image optimized image functionality.
 *
 * @see `NgOptimizedImage`
 * @publicApi
 * @developerPreview
 */
export const IMAGE_CONFIG = new InjectionToken('ImageConfig', { providedIn: 'root', factory: () => defaultConfig });
/**
 * Directive that improves image loading performance by enforcing best practices.
 *
 * `NgOptimizedImage` ensures that the loading of the Largest Contentful Paint (LCP) image is
 * prioritized by:
 * - Automatically setting the `fetchpriority` attribute on the `<img>` tag
 * - Lazy loading non-priority images by default
 * - Asserting that there is a corresponding preconnect link tag in the document head
 *
 * In addition, the directive:
 * - Generates appropriate asset URLs if a corresponding `ImageLoader` function is provided
 * - Automatically generates a srcset
 * - Requires that `width` and `height` are set
 * - Warns if `width` or `height` have been set incorrectly
 * - Warns if the image will be visually distorted when rendered
 *
 * @usageNotes
 * The `NgOptimizedImage` directive is marked as [standalone](guide/standalone-components) and can
 * be imported directly.
 *
 * Follow the steps below to enable and use the directive:
 * 1. Import it into the necessary NgModule or a standalone Component.
 * 2. Optionally provide an `ImageLoader` if you use an image hosting service.
 * 3. Update the necessary `<img>` tags in templates and replace `src` attributes with `ngSrc`.
 * Using a `ngSrc` allows the directive to control when the `src` gets set, which triggers an image
 * download.
 *
 * Step 1: import the `NgOptimizedImage` directive.
 *
 * ```typescript
 * import { NgOptimizedImage } from '@angular/common';
 *
 * // Include it into the necessary NgModule
 * @NgModule({
 *   imports: [NgOptimizedImage],
 * })
 * class AppModule {}
 *
 * // ... or a standalone Component
 * @Component({
 *   standalone: true
 *   imports: [NgOptimizedImage],
 * })
 * class MyStandaloneComponent {}
 * ```
 *
 * Step 2: configure a loader.
 *
 * To use the **default loader**: no additional code changes are necessary. The URL returned by the
 * generic loader will always match the value of "src". In other words, this loader applies no
 * transformations to the resource URL and the value of the `ngSrc` attribute will be used as is.
 *
 * To use an existing loader for a **third-party image service**: add the provider factory for your
 * chosen service to the `providers` array. In the example below, the Imgix loader is used:
 *
 * ```typescript
 * import {provideImgixLoader} from '@angular/common';
 *
 * // Call the function and add the result to the `providers` array:
 * providers: [
 *   provideImgixLoader("https://my.base.url/"),
 * ],
 * ```
 *
 * The `NgOptimizedImage` directive provides the following functions:
 * - `provideCloudflareLoader`
 * - `provideCloudinaryLoader`
 * - `provideImageKitLoader`
 * - `provideImgixLoader`
 *
 * If you use a different image provider, you can create a custom loader function as described
 * below.
 *
 * To use a **custom loader**: provide your loader function as a value for the `IMAGE_LOADER` DI
 * token.
 *
 * ```typescript
 * import {IMAGE_LOADER, ImageLoaderConfig} from '@angular/common';
 *
 * // Configure the loader using the `IMAGE_LOADER` token.
 * providers: [
 *   {
 *      provide: IMAGE_LOADER,
 *      useValue: (config: ImageLoaderConfig) => {
 *        return `https://example.com/${config.src}-${config.width}.jpg}`;
 *      }
 *   },
 * ],
 * ```
 *
 * Step 3: update `<img>` tags in templates to use `ngSrc` instead of `src`.
 *
 * ```
 * <img ngSrc="logo.png" width="200" height="100">
 * ```
 *
 * @publicApi
 */
export class NgOptimizedImage {
    constructor() {
        this.imageLoader = inject(IMAGE_LOADER);
        this.config = processConfig(inject(IMAGE_CONFIG));
        this.renderer = inject(Renderer2);
        this.imgElement = inject(ElementRef).nativeElement;
        this.injector = inject(Injector);
        this.isServer = isPlatformServer(inject(PLATFORM_ID));
        this.preloadLinkChecker = inject(PreloadLinkCreator);
        // a LCP image observer - should be injected only in the dev mode
        this.lcpObserver = ngDevMode ? this.injector.get(LCPImageObserver) : null;
        /**
         * Calculate the rewritten `src` once and store it.
         * This is needed to avoid repetitive calculations and make sure the directive cleanup in the
         * `ngOnDestroy` does not rely on the `IMAGE_LOADER` logic (which in turn can rely on some other
         * instance that might be already destroyed).
         */
        this._renderedSrc = null;
        this._priority = false;
        this._disableOptimizedSrcset = false;
        this._fill = false;
    }
    /**
     * For responsive images: the intrinsic width of the image in pixels.
     * For fixed size images: the desired rendered width of the image in pixels.
     */
    set width(value) {
        ngDevMode && assertGreaterThanZero(this, value, 'width');
        this._width = inputToInteger(value);
    }
    get width() {
        return this._width;
    }
    /**
     * For responsive images: the intrinsic height of the image in pixels.
     * For fixed size images: the desired rendered height of the image in pixels.* The intrinsic
     * height of the image in pixels.
     */
    set height(value) {
        ngDevMode && assertGreaterThanZero(this, value, 'height');
        this._height = inputToInteger(value);
    }
    get height() {
        return this._height;
    }
    /**
     * Indicates whether this image should have a high priority.
     */
    set priority(value) {
        this._priority = inputToBoolean(value);
    }
    get priority() {
        return this._priority;
    }
    /**
     * Disables automatic srcset generation for this image.
     */
    set disableOptimizedSrcset(value) {
        this._disableOptimizedSrcset = inputToBoolean(value);
    }
    get disableOptimizedSrcset() {
        return this._disableOptimizedSrcset;
    }
    /**
     * Sets the image to "fill mode", which eliminates the height/width requirement and adds
     * styles such that the image fills its containing element.
     *
     * @developerPreview
     */
    set fill(value) {
        this._fill = inputToBoolean(value);
    }
    get fill() {
        return this._fill;
    }
    /** @nodoc */
    ngOnInit() {
        if (ngDevMode) {
            assertNonEmptyInput(this, 'ngSrc', this.ngSrc);
            assertValidNgSrcset(this, this.ngSrcset);
            assertNoConflictingSrc(this);
            if (this.ngSrcset) {
                assertNoConflictingSrcset(this);
            }
            assertNotBase64Image(this);
            assertNotBlobUrl(this);
            if (this.fill) {
                assertEmptyWidthAndHeight(this);
                assertNonZeroRenderedHeight(this, this.imgElement, this.renderer);
            }
            else {
                assertNonEmptyWidthAndHeight(this);
                // Only check for distorted images when not in fill mode, where
                // images may be intentionally stretched, cropped or letterboxed.
                assertNoImageDistortion(this, this.imgElement, this.renderer);
            }
            assertValidLoadingInput(this);
            if (!this.ngSrcset) {
                assertNoComplexSizes(this);
            }
            assertNotMissingBuiltInLoader(this.ngSrc, this.imageLoader);
            assertNoNgSrcsetWithoutLoader(this, this.imageLoader);
            assertNoLoaderParamsWithoutLoader(this, this.imageLoader);
            if (this.priority) {
                const checker = this.injector.get(PreconnectLinkChecker);
                checker.assertPreconnect(this.getRewrittenSrc(), this.ngSrc);
            }
            else {
                // Monitor whether an image is an LCP element only in case
                // the `priority` attribute is missing. Otherwise, an image
                // has the necessary settings and no extra checks are required.
                if (this.lcpObserver !== null) {
                    const ngZone = this.injector.get(NgZone);
                    ngZone.runOutsideAngular(() => {
                        this.lcpObserver.registerImage(this.getRewrittenSrc(), this.ngSrc);
                    });
                }
            }
        }
        this.setHostAttributes();
    }
    setHostAttributes() {
        // Must set width/height explicitly in case they are bound (in which case they will
        // only be reflected and not found by the browser)
        if (this.fill) {
            if (!this.sizes) {
                this.sizes = '100vw';
            }
        }
        else {
            this.setHostAttribute('width', this.width.toString());
            this.setHostAttribute('height', this.height.toString());
        }
        this.setHostAttribute('loading', this.getLoadingBehavior());
        this.setHostAttribute('fetchpriority', this.getFetchPriority());
        // The `data-ng-img` attribute flags an image as using the directive, to allow
        // for analysis of the directive's performance.
        this.setHostAttribute('ng-img', 'true');
        // The `src` and `srcset` attributes should be set last since other attributes
        // could affect the image's loading behavior.
        const rewrittenSrc = this.getRewrittenSrc();
        this.setHostAttribute('src', rewrittenSrc);
        let rewrittenSrcset = undefined;
        if (this.sizes) {
            this.setHostAttribute('sizes', this.sizes);
        }
        if (this.ngSrcset) {
            rewrittenSrcset = this.getRewrittenSrcset();
        }
        else if (this.shouldGenerateAutomaticSrcset()) {
            rewrittenSrcset = this.getAutomaticSrcset();
        }
        if (rewrittenSrcset) {
            this.setHostAttribute('srcset', rewrittenSrcset);
        }
        if (this.isServer && this.priority) {
            this.preloadLinkChecker.createPreloadLinkTag(this.renderer, rewrittenSrc, rewrittenSrcset, this.sizes);
        }
    }
    /** @nodoc */
    ngOnChanges(changes) {
        if (ngDevMode) {
            assertNoPostInitInputChange(this, changes, [
                'ngSrc',
                'ngSrcset',
                'width',
                'height',
                'priority',
                'fill',
                'loading',
                'sizes',
                'loaderParams',
                'disableOptimizedSrcset',
            ]);
        }
    }
    callImageLoader(configWithoutCustomParams) {
        let augmentedConfig = configWithoutCustomParams;
        if (this.loaderParams) {
            augmentedConfig.loaderParams = this.loaderParams;
        }
        return this.imageLoader(augmentedConfig);
    }
    getLoadingBehavior() {
        if (!this.priority && this.loading !== undefined) {
            return this.loading;
        }
        return this.priority ? 'eager' : 'lazy';
    }
    getFetchPriority() {
        return this.priority ? 'high' : 'auto';
    }
    getRewrittenSrc() {
        // ImageLoaderConfig supports setting a width property. However, we're not setting width here
        // because if the developer uses rendered width instead of intrinsic width in the HTML width
        // attribute, the image requested may be too small for 2x+ screens.
        if (!this._renderedSrc) {
            const imgConfig = { src: this.ngSrc };
            // Cache calculated image src to reuse it later in the code.
            this._renderedSrc = this.callImageLoader(imgConfig);
        }
        return this._renderedSrc;
    }
    getRewrittenSrcset() {
        const widthSrcSet = VALID_WIDTH_DESCRIPTOR_SRCSET.test(this.ngSrcset);
        const finalSrcs = this.ngSrcset.split(',').filter(src => src !== '').map(srcStr => {
            srcStr = srcStr.trim();
            const width = widthSrcSet ? parseFloat(srcStr) : parseFloat(srcStr) * this.width;
            return `${this.callImageLoader({ src: this.ngSrc, width })} ${srcStr}`;
        });
        return finalSrcs.join(', ');
    }
    getAutomaticSrcset() {
        if (this.sizes) {
            return this.getResponsiveSrcset();
        }
        else {
            return this.getFixedSrcset();
        }
    }
    getResponsiveSrcset() {
        const { breakpoints } = this.config;
        let filteredBreakpoints = breakpoints;
        if (this.sizes?.trim() === '100vw') {
            // Since this is a full-screen-width image, our srcset only needs to include
            // breakpoints with full viewport widths.
            filteredBreakpoints = breakpoints.filter(bp => bp >= VIEWPORT_BREAKPOINT_CUTOFF);
        }
        const finalSrcs = filteredBreakpoints.map(bp => `${this.callImageLoader({ src: this.ngSrc, width: bp })} ${bp}w`);
        return finalSrcs.join(', ');
    }
    getFixedSrcset() {
        const finalSrcs = DENSITY_SRCSET_MULTIPLIERS.map(multiplier => {
            const imgUrl = this.callImageLoader({ src: this.ngSrc, width: this.width * multiplier });
            return `${imgUrl} ${multiplier}x`;
        });
        return finalSrcs.join(', ');
    }
    shouldGenerateAutomaticSrcset() {
        return !this._disableOptimizedSrcset && !this.srcset && this.imageLoader !== noopImageLoader &&
            !(this.width > FIXED_SRCSET_WIDTH_LIMIT || this.height > FIXED_SRCSET_HEIGHT_LIMIT);
    }
    /** @nodoc */
    ngOnDestroy() {
        if (ngDevMode) {
            if (!this.priority && this._renderedSrc !== null && this.lcpObserver !== null) {
                this.lcpObserver.unregisterImage(this._renderedSrc);
            }
        }
    }
    setHostAttribute(name, value) {
        this.renderer.setAttribute(this.imgElement, name, value);
    }
}
NgOptimizedImage.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: NgOptimizedImage, deps: [], target: i0.ɵɵFactoryTarget.Directive });
NgOptimizedImage.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.3.0", type: NgOptimizedImage, isStandalone: true, selector: "img[ngSrc]", inputs: { ngSrc: "ngSrc", ngSrcset: "ngSrcset", sizes: "sizes", width: "width", height: "height", loading: "loading", priority: "priority", loaderParams: "loaderParams", disableOptimizedSrcset: "disableOptimizedSrcset", fill: "fill", src: "src", srcset: "srcset" }, host: { properties: { "style.position": "fill ? \"absolute\" : null", "style.width": "fill ? \"100%\" : null", "style.height": "fill ? \"100%\" : null", "style.inset": "fill ? \"0px\" : null" } }, usesOnChanges: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: NgOptimizedImage, decorators: [{
            type: Directive,
            args: [{
                    standalone: true,
                    selector: 'img[ngSrc]',
                    host: {
                        '[style.position]': 'fill ? "absolute" : null',
                        '[style.width]': 'fill ? "100%" : null',
                        '[style.height]': 'fill ? "100%" : null',
                        '[style.inset]': 'fill ? "0px" : null'
                    }
                }]
        }], propDecorators: { ngSrc: [{
                type: Input
            }], ngSrcset: [{
                type: Input
            }], sizes: [{
                type: Input
            }], width: [{
                type: Input
            }], height: [{
                type: Input
            }], loading: [{
                type: Input
            }], priority: [{
                type: Input
            }], loaderParams: [{
                type: Input
            }], disableOptimizedSrcset: [{
                type: Input
            }], fill: [{
                type: Input
            }], src: [{
                type: Input
            }], srcset: [{
                type: Input
            }] } });
/***** Helpers *****/
/**
 * Convert input value to integer.
 */
function inputToInteger(value) {
    return typeof value === 'string' ? parseInt(value, 10) : value;
}
/**
 * Convert input value to boolean.
 */
function inputToBoolean(value) {
    return value != null && `${value}` !== 'false';
}
/**
 * Sorts provided config breakpoints and uses defaults.
 */
function processConfig(config) {
    let sortedBreakpoints = {};
    if (config.breakpoints) {
        sortedBreakpoints.breakpoints = config.breakpoints.sort((a, b) => a - b);
    }
    return Object.assign({}, defaultConfig, config, sortedBreakpoints);
}
/***** Assert functions *****/
/**
 * Verifies that there is no `src` set on a host element.
 */
function assertNoConflictingSrc(dir) {
    if (dir.src) {
        throw new RuntimeError(2950 /* RuntimeErrorCode.UNEXPECTED_SRC_ATTR */, `${imgDirectiveDetails(dir.ngSrc)} both \`src\` and \`ngSrc\` have been set. ` +
            `Supplying both of these attributes breaks lazy loading. ` +
            `The NgOptimizedImage directive sets \`src\` itself based on the value of \`ngSrc\`. ` +
            `To fix this, please remove the \`src\` attribute.`);
    }
}
/**
 * Verifies that there is no `srcset` set on a host element.
 */
function assertNoConflictingSrcset(dir) {
    if (dir.srcset) {
        throw new RuntimeError(2951 /* RuntimeErrorCode.UNEXPECTED_SRCSET_ATTR */, `${imgDirectiveDetails(dir.ngSrc)} both \`srcset\` and \`ngSrcset\` have been set. ` +
            `Supplying both of these attributes breaks lazy loading. ` +
            `The NgOptimizedImage directive sets \`srcset\` itself based on the value of ` +
            `\`ngSrcset\`. To fix this, please remove the \`srcset\` attribute.`);
    }
}
/**
 * Verifies that the `ngSrc` is not a Base64-encoded image.
 */
function assertNotBase64Image(dir) {
    let ngSrc = dir.ngSrc.trim();
    if (ngSrc.startsWith('data:')) {
        if (ngSrc.length > BASE64_IMG_MAX_LENGTH_IN_ERROR) {
            ngSrc = ngSrc.substring(0, BASE64_IMG_MAX_LENGTH_IN_ERROR) + '...';
        }
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc, false)} \`ngSrc\` is a Base64-encoded string ` +
            `(${ngSrc}). NgOptimizedImage does not support Base64-encoded strings. ` +
            `To fix this, disable the NgOptimizedImage directive for this element ` +
            `by removing \`ngSrc\` and using a standard \`src\` attribute instead.`);
    }
}
/**
 * Verifies that the 'sizes' only includes responsive values.
 */
function assertNoComplexSizes(dir) {
    let sizes = dir.sizes;
    if (sizes?.match(/((\)|,)\s|^)\d+px/)) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc, false)} \`sizes\` was set to a string including ` +
            `pixel values. For automatic \`srcset\` generation, \`sizes\` must only include responsive ` +
            `values, such as \`sizes="50vw"\` or \`sizes="(min-width: 768px) 50vw, 100vw"\`. ` +
            `To fix this, modify the \`sizes\` attribute, or provide your own \`ngSrcset\` value directly.`);
    }
}
/**
 * Verifies that the `ngSrc` is not a Blob URL.
 */
function assertNotBlobUrl(dir) {
    const ngSrc = dir.ngSrc.trim();
    if (ngSrc.startsWith('blob:')) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} \`ngSrc\` was set to a blob URL (${ngSrc}). ` +
            `Blob URLs are not supported by the NgOptimizedImage directive. ` +
            `To fix this, disable the NgOptimizedImage directive for this element ` +
            `by removing \`ngSrc\` and using a regular \`src\` attribute instead.`);
    }
}
/**
 * Verifies that the input is set to a non-empty string.
 */
function assertNonEmptyInput(dir, name, value) {
    const isString = typeof value === 'string';
    const isEmptyString = isString && value.trim() === '';
    if (!isString || isEmptyString) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} \`${name}\` has an invalid value ` +
            `(\`${value}\`). To fix this, change the value to a non-empty string.`);
    }
}
/**
 * Verifies that the `ngSrcset` is in a valid format, e.g. "100w, 200w" or "1x, 2x".
 */
export function assertValidNgSrcset(dir, value) {
    if (value == null)
        return;
    assertNonEmptyInput(dir, 'ngSrcset', value);
    const stringVal = value;
    const isValidWidthDescriptor = VALID_WIDTH_DESCRIPTOR_SRCSET.test(stringVal);
    const isValidDensityDescriptor = VALID_DENSITY_DESCRIPTOR_SRCSET.test(stringVal);
    if (isValidDensityDescriptor) {
        assertUnderDensityCap(dir, stringVal);
    }
    const isValidSrcset = isValidWidthDescriptor || isValidDensityDescriptor;
    if (!isValidSrcset) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} \`ngSrcset\` has an invalid value (\`${value}\`). ` +
            `To fix this, supply \`ngSrcset\` using a comma-separated list of one or more width ` +
            `descriptors (e.g. "100w, 200w") or density descriptors (e.g. "1x, 2x").`);
    }
}
function assertUnderDensityCap(dir, value) {
    const underDensityCap = value.split(',').every(num => num === '' || parseFloat(num) <= ABSOLUTE_SRCSET_DENSITY_CAP);
    if (!underDensityCap) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} the \`ngSrcset\` contains an unsupported image density:` +
            `\`${value}\`. NgOptimizedImage generally recommends a max image density of ` +
            `${RECOMMENDED_SRCSET_DENSITY_CAP}x but supports image densities up to ` +
            `${ABSOLUTE_SRCSET_DENSITY_CAP}x. The human eye cannot distinguish between image densities ` +
            `greater than ${RECOMMENDED_SRCSET_DENSITY_CAP}x - which makes them unnecessary for ` +
            `most use cases. Images that will be pinch-zoomed are typically the primary use case for ` +
            `${ABSOLUTE_SRCSET_DENSITY_CAP}x images. Please remove the high density descriptor and try again.`);
    }
}
/**
 * Creates a `RuntimeError` instance to represent a situation when an input is set after
 * the directive has initialized.
 */
function postInitInputChangeError(dir, inputName) {
    let reason;
    if (inputName === 'width' || inputName === 'height') {
        reason = `Changing \`${inputName}\` may result in different attribute value ` +
            `applied to the underlying image element and cause layout shifts on a page.`;
    }
    else {
        reason = `Changing the \`${inputName}\` would have no effect on the underlying ` +
            `image element, because the resource loading has already occurred.`;
    }
    return new RuntimeError(2953 /* RuntimeErrorCode.UNEXPECTED_INPUT_CHANGE */, `${imgDirectiveDetails(dir.ngSrc)} \`${inputName}\` was updated after initialization. ` +
        `The NgOptimizedImage directive will not react to this input change. ${reason} ` +
        `To fix this, either switch \`${inputName}\` to a static value ` +
        `or wrap the image element in an *ngIf that is gated on the necessary value.`);
}
/**
 * Verify that none of the listed inputs has changed.
 */
function assertNoPostInitInputChange(dir, changes, inputs) {
    inputs.forEach(input => {
        const isUpdated = changes.hasOwnProperty(input);
        if (isUpdated && !changes[input].isFirstChange()) {
            if (input === 'ngSrc') {
                // When the `ngSrc` input changes, we detect that only in the
                // `ngOnChanges` hook, thus the `ngSrc` is already set. We use
                // `ngSrc` in the error message, so we use a previous value, but
                // not the updated one in it.
                dir = { ngSrc: changes[input].previousValue };
            }
            throw postInitInputChangeError(dir, input);
        }
    });
}
/**
 * Verifies that a specified input is a number greater than 0.
 */
function assertGreaterThanZero(dir, inputValue, inputName) {
    const validNumber = typeof inputValue === 'number' && inputValue > 0;
    const validString = typeof inputValue === 'string' && /^\d+$/.test(inputValue.trim()) && parseInt(inputValue) > 0;
    if (!validNumber && !validString) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} \`${inputName}\` has an invalid value ` +
            `(\`${inputValue}\`). To fix this, provide \`${inputName}\` ` +
            `as a number greater than 0.`);
    }
}
/**
 * Verifies that the rendered image is not visually distorted. Effectively this is checking:
 * - Whether the "width" and "height" attributes reflect the actual dimensions of the image.
 * - Whether image styling is "correct" (see below for a longer explanation).
 */
function assertNoImageDistortion(dir, img, renderer) {
    const removeListenerFn = renderer.listen(img, 'load', () => {
        removeListenerFn();
        const renderedWidth = img.clientWidth;
        const renderedHeight = img.clientHeight;
        const renderedAspectRatio = renderedWidth / renderedHeight;
        const nonZeroRenderedDimensions = renderedWidth !== 0 && renderedHeight !== 0;
        const intrinsicWidth = img.naturalWidth;
        const intrinsicHeight = img.naturalHeight;
        const intrinsicAspectRatio = intrinsicWidth / intrinsicHeight;
        const suppliedWidth = dir.width;
        const suppliedHeight = dir.height;
        const suppliedAspectRatio = suppliedWidth / suppliedHeight;
        // Tolerance is used to account for the impact of subpixel rendering.
        // Due to subpixel rendering, the rendered, intrinsic, and supplied
        // aspect ratios of a correctly configured image may not exactly match.
        // For example, a `width=4030 height=3020` image might have a rendered
        // size of "1062w, 796.48h". (An aspect ratio of 1.334... vs. 1.333...)
        const inaccurateDimensions = Math.abs(suppliedAspectRatio - intrinsicAspectRatio) > ASPECT_RATIO_TOLERANCE;
        const stylingDistortion = nonZeroRenderedDimensions &&
            Math.abs(intrinsicAspectRatio - renderedAspectRatio) > ASPECT_RATIO_TOLERANCE;
        if (inaccurateDimensions) {
            console.warn(formatRuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} the aspect ratio of the image does not match ` +
                `the aspect ratio indicated by the width and height attributes. ` +
                `\nIntrinsic image size: ${intrinsicWidth}w x ${intrinsicHeight}h ` +
                `(aspect-ratio: ${intrinsicAspectRatio}). \nSupplied width and height attributes: ` +
                `${suppliedWidth}w x ${suppliedHeight}h (aspect-ratio: ${suppliedAspectRatio}). ` +
                `\nTo fix this, update the width and height attributes.`));
        }
        else if (stylingDistortion) {
            console.warn(formatRuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} the aspect ratio of the rendered image ` +
                `does not match the image's intrinsic aspect ratio. ` +
                `\nIntrinsic image size: ${intrinsicWidth}w x ${intrinsicHeight}h ` +
                `(aspect-ratio: ${intrinsicAspectRatio}). \nRendered image size: ` +
                `${renderedWidth}w x ${renderedHeight}h (aspect-ratio: ` +
                `${renderedAspectRatio}). \nThis issue can occur if "width" and "height" ` +
                `attributes are added to an image without updating the corresponding ` +
                `image styling. To fix this, adjust image styling. In most cases, ` +
                `adding "height: auto" or "width: auto" to the image styling will fix ` +
                `this issue.`));
        }
        else if (!dir.ngSrcset && nonZeroRenderedDimensions) {
            // If `ngSrcset` hasn't been set, sanity check the intrinsic size.
            const recommendedWidth = RECOMMENDED_SRCSET_DENSITY_CAP * renderedWidth;
            const recommendedHeight = RECOMMENDED_SRCSET_DENSITY_CAP * renderedHeight;
            const oversizedWidth = (intrinsicWidth - recommendedWidth) >= OVERSIZED_IMAGE_TOLERANCE;
            const oversizedHeight = (intrinsicHeight - recommendedHeight) >= OVERSIZED_IMAGE_TOLERANCE;
            if (oversizedWidth || oversizedHeight) {
                console.warn(formatRuntimeError(2960 /* RuntimeErrorCode.OVERSIZED_IMAGE */, `${imgDirectiveDetails(dir.ngSrc)} the intrinsic image is significantly ` +
                    `larger than necessary. ` +
                    `\nRendered image size: ${renderedWidth}w x ${renderedHeight}h. ` +
                    `\nIntrinsic image size: ${intrinsicWidth}w x ${intrinsicHeight}h. ` +
                    `\nRecommended intrinsic image size: ${recommendedWidth}w x ${recommendedHeight}h. ` +
                    `\nNote: Recommended intrinsic image size is calculated assuming a maximum DPR of ` +
                    `${RECOMMENDED_SRCSET_DENSITY_CAP}. To improve loading time, resize the image ` +
                    `or consider using the "ngSrcset" and "sizes" attributes.`));
            }
        }
    });
}
/**
 * Verifies that a specified input is set.
 */
function assertNonEmptyWidthAndHeight(dir) {
    let missingAttributes = [];
    if (dir.width === undefined)
        missingAttributes.push('width');
    if (dir.height === undefined)
        missingAttributes.push('height');
    if (missingAttributes.length > 0) {
        throw new RuntimeError(2954 /* RuntimeErrorCode.REQUIRED_INPUT_MISSING */, `${imgDirectiveDetails(dir.ngSrc)} these required attributes ` +
            `are missing: ${missingAttributes.map(attr => `"${attr}"`).join(', ')}. ` +
            `Including "width" and "height" attributes will prevent image-related layout shifts. ` +
            `To fix this, include "width" and "height" attributes on the image tag or turn on ` +
            `"fill" mode with the \`fill\` attribute.`);
    }
}
/**
 * Verifies that width and height are not set. Used in fill mode, where those attributes don't make
 * sense.
 */
function assertEmptyWidthAndHeight(dir) {
    if (dir.width || dir.height) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} the attributes \`height\` and/or \`width\` are present ` +
            `along with the \`fill\` attribute. Because \`fill\` mode causes an image to fill its containing ` +
            `element, the size attributes have no effect and should be removed.`);
    }
}
/**
 * Verifies that the rendered image has a nonzero height. If the image is in fill mode, provides
 * guidance that this can be caused by the containing element's CSS position property.
 */
function assertNonZeroRenderedHeight(dir, img, renderer) {
    const removeListenerFn = renderer.listen(img, 'load', () => {
        removeListenerFn();
        const renderedHeight = img.clientHeight;
        if (dir.fill && renderedHeight === 0) {
            console.warn(formatRuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} the height of the fill-mode image is zero. ` +
                `This is likely because the containing element does not have the CSS 'position' ` +
                `property set to one of the following: "relative", "fixed", or "absolute". ` +
                `To fix this problem, make sure the container element has the CSS 'position' ` +
                `property defined and the height of the element is not zero.`));
        }
    });
}
/**
 * Verifies that the `loading` attribute is set to a valid input &
 * is not used on priority images.
 */
function assertValidLoadingInput(dir) {
    if (dir.loading && dir.priority) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} the \`loading\` attribute ` +
            `was used on an image that was marked "priority". ` +
            `Setting \`loading\` on priority images is not allowed ` +
            `because these images will always be eagerly loaded. ` +
            `To fix this, remove the “loading” attribute from the priority image.`);
    }
    const validInputs = ['auto', 'eager', 'lazy'];
    if (typeof dir.loading === 'string' && !validInputs.includes(dir.loading)) {
        throw new RuntimeError(2952 /* RuntimeErrorCode.INVALID_INPUT */, `${imgDirectiveDetails(dir.ngSrc)} the \`loading\` attribute ` +
            `has an invalid value (\`${dir.loading}\`). ` +
            `To fix this, provide a valid value ("lazy", "eager", or "auto").`);
    }
}
/**
 * Warns if NOT using a loader (falling back to the generic loader) and
 * the image appears to be hosted on one of the image CDNs for which
 * we do have a built-in image loader. Suggests switching to the
 * built-in loader.
 *
 * @param ngSrc Value of the ngSrc attribute
 * @param imageLoader ImageLoader provided
 */
function assertNotMissingBuiltInLoader(ngSrc, imageLoader) {
    if (imageLoader === noopImageLoader) {
        let builtInLoaderName = '';
        for (const loader of BUILT_IN_LOADERS) {
            if (loader.testUrl(ngSrc)) {
                builtInLoaderName = loader.name;
                break;
            }
        }
        if (builtInLoaderName) {
            console.warn(formatRuntimeError(2962 /* RuntimeErrorCode.MISSING_BUILTIN_LOADER */, `NgOptimizedImage: It looks like your images may be hosted on the ` +
                `${builtInLoaderName} CDN, but your app is not using Angular's ` +
                `built-in loader for that CDN. We recommend switching to use ` +
                `the built-in by calling \`provide${builtInLoaderName}Loader()\` ` +
                `in your \`providers\` and passing it your instance's base URL. ` +
                `If you don't want to use the built-in loader, define a custom ` +
                `loader function using IMAGE_LOADER to silence this warning.`));
        }
    }
}
/**
 * Warns if ngSrcset is present and no loader is configured (i.e. the default one is being used).
 */
function assertNoNgSrcsetWithoutLoader(dir, imageLoader) {
    if (dir.ngSrcset && imageLoader === noopImageLoader) {
        console.warn(formatRuntimeError(2963 /* RuntimeErrorCode.MISSING_NECESSARY_LOADER */, `${imgDirectiveDetails(dir.ngSrc)} the \`ngSrcset\` attribute is present but ` +
            `no image loader is configured (i.e. the default one is being used), ` +
            `which would result in the same image being used for all configured sizes. ` +
            `To fix this, provide a loader or remove the \`ngSrcset\` attribute from the image.`));
    }
}
/**
 * Warns if loaderParams is present and no loader is configured (i.e. the default one is being
 * used).
 */
function assertNoLoaderParamsWithoutLoader(dir, imageLoader) {
    if (dir.loaderParams && imageLoader === noopImageLoader) {
        console.warn(formatRuntimeError(2963 /* RuntimeErrorCode.MISSING_NECESSARY_LOADER */, `${imgDirectiveDetails(dir.ngSrc)} the \`loaderParams\` attribute is present but ` +
            `no image loader is configured (i.e. the default one is being used), ` +
            `which means that the loaderParams data will not be consumed and will not affect the URL. ` +
            `To fix this, provide a custom loader or remove the \`loaderParams\` attribute from the image.`));
    }
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Directive, ElementRef, inject, InjectionToken, Injector, Input, NgZone, OnChanges, OnDestroy, OnInit, PLATFORM_ID, Renderer2, SimpleChanges, ɵformatRuntimeError as formatRuntimeError, ɵRuntimeError as RuntimeError} from '@angular/core';\n\nimport {RuntimeErrorCode} from '../../errors';\nimport {isPlatformServer} from '../../platform_id';\n\nimport {imgDirectiveDetails} from './error_helper';\nimport {cloudinaryLoaderInfo} from './image_loaders/cloudinary_loader';\nimport {IMAGE_LOADER, ImageLoader, ImageLoaderConfig, noopImageLoader} from './image_loaders/image_loader';\nimport {imageKitLoaderInfo} from './image_loaders/imagekit_loader';\nimport {imgixLoaderInfo} from './image_loaders/imgix_loader';\nimport {LCPImageObserver} from './lcp_image_observer';\nimport {PreconnectLinkChecker} from './preconnect_link_checker';\nimport {PreloadLinkCreator} from './preload-link-creator';\n\n/**\n * When a Base64-encoded image is passed as an input to the `NgOptimizedImage` directive,\n * an error is thrown. The image content (as a string) might be very long, thus making\n * it hard to read an error message if the entire string is included. This const defines\n * the number of characters that should be included into the error message. The rest\n * of the content is truncated.\n */\nconst BASE64_IMG_MAX_LENGTH_IN_ERROR = 50;\n\n/**\n * RegExpr to determine whether a src in a srcset is using width descriptors.\n * Should match something like: \"100w, 200w\".\n */\nconst VALID_WIDTH_DESCRIPTOR_SRCSET = /^((\\s*\\d+w\\s*(,|$)){1,})$/;\n\n/**\n * RegExpr to determine whether a src in a srcset is using density descriptors.\n * Should match something like: \"1x, 2x, 50x\". Also supports decimals like \"1.5x, 1.50x\".\n */\nconst VALID_DENSITY_DESCRIPTOR_SRCSET = /^((\\s*\\d+(\\.\\d+)?x\\s*(,|$)){1,})$/;\n\n/**\n * Srcset values with a density descriptor higher than this value will actively\n * throw an error. Such densities are not permitted as they cause image sizes\n * to be unreasonably large and slow down LCP.\n */\nexport const ABSOLUTE_SRCSET_DENSITY_CAP = 3;\n\n/**\n * Used only in error message text to communicate best practices, as we will\n * only throw based on the slightly more conservative ABSOLUTE_SRCSET_DENSITY_CAP.\n */\nexport const RECOMMENDED_SRCSET_DENSITY_CAP = 2;\n\n/**\n * Used in generating automatic density-based srcsets\n */\nconst DENSITY_SRCSET_MULTIPLIERS = [1, 2];\n\n/**\n * Used to determine which breakpoints to use on full-width images\n */\nconst VIEWPORT_BREAKPOINT_CUTOFF = 640;\n/**\n * Used to determine whether two aspect ratios are similar in value.\n */\nconst ASPECT_RATIO_TOLERANCE = .1;\n\n/**\n * Used to determine whether the image has been requested at an overly\n * large size compared to the actual rendered image size (after taking\n * into account a typical device pixel ratio). In pixels.\n */\nconst OVERSIZED_IMAGE_TOLERANCE = 1000;\n\n/**\n * Used to limit automatic srcset generation of very large sources for\n * fixed-size images. In pixels.\n */\nconst FIXED_SRCSET_WIDTH_LIMIT = 1920;\nconst FIXED_SRCSET_HEIGHT_LIMIT = 1080;\n\n\n/** Info about built-in loaders we can test for. */\nexport const BUILT_IN_LOADERS = [imgixLoaderInfo, imageKitLoaderInfo, cloudinaryLoaderInfo];\n\n/**\n * A configuration object for the NgOptimizedImage directive. Contains:\n * - breakpoints: An array of integer breakpoints used to generate\n *      srcsets for responsive images.\n *\n * Learn more about the responsive image configuration in [the NgOptimizedImage\n * guide](guide/image-directive).\n * @publicApi\n * @developerPreview\n */\nexport type ImageConfig = {\n  breakpoints?: number[]\n};\n\nconst defaultConfig: ImageConfig = {\n  breakpoints: [16, 32, 48, 64, 96, 128, 256, 384, 640, 750, 828, 1080, 1200, 1920, 2048, 3840],\n};\n\n/**\n * Injection token that configures the image optimized image functionality.\n *\n * @see `NgOptimizedImage`\n * @publicApi\n * @developerPreview\n */\nexport const IMAGE_CONFIG = new InjectionToken<ImageConfig>(\n    'ImageConfig', {providedIn: 'root', factory: () => defaultConfig});\n\n/**\n * Directive that improves image loading performance by enforcing best practices.\n *\n * `NgOptimizedImage` ensures that the loading of the Largest Contentful Paint (LCP) image is\n * prioritized by:\n * - Automatically setting the `fetchpriority` attribute on the `<img>` tag\n * - Lazy loading non-priority images by default\n * - Asserting that there is a corresponding preconnect link tag in the document head\n *\n * In addition, the directive:\n * - Generates appropriate asset URLs if a corresponding `ImageLoader` function is provided\n * - Automatically generates a srcset\n * - Requires that `width` and `height` are set\n * - Warns if `width` or `height` have been set incorrectly\n * - Warns if the image will be visually distorted when rendered\n *\n * @usageNotes\n * The `NgOptimizedImage` directive is marked as [standalone](guide/standalone-components) and can\n * be imported directly.\n *\n * Follow the steps below to enable and use the directive:\n * 1. Import it into the necessary NgModule or a standalone Component.\n * 2. Optionally provide an `ImageLoader` if you use an image hosting service.\n * 3. Update the necessary `<img>` tags in templates and replace `src` attributes with `ngSrc`.\n * Using a `ngSrc` allows the directive to control when the `src` gets set, which triggers an image\n * download.\n *\n * Step 1: import the `NgOptimizedImage` directive.\n *\n * ```typescript\n * import { NgOptimizedImage } from '@angular/common';\n *\n * // Include it into the necessary NgModule\n * @NgModule({\n *   imports: [NgOptimizedImage],\n * })\n * class AppModule {}\n *\n * // ... or a standalone Component\n * @Component({\n *   standalone: true\n *   imports: [NgOptimizedImage],\n * })\n * class MyStandaloneComponent {}\n * ```\n *\n * Step 2: configure a loader.\n *\n * To use the **default loader**: no additional code changes are necessary. The URL returned by the\n * generic loader will always match the value of \"src\". In other words, this loader applies no\n * transformations to the resource URL and the value of the `ngSrc` attribute will be used as is.\n *\n * To use an existing loader for a **third-party image service**: add the provider factory for your\n * chosen service to the `providers` array. In the example below, the Imgix loader is used:\n *\n * ```typescript\n * import {provideImgixLoader} from '@angular/common';\n *\n * // Call the function and add the result to the `providers` array:\n * providers: [\n *   provideImgixLoader(\"https://my.base.url/\"),\n * ],\n * ```\n *\n * The `NgOptimizedImage` directive provides the following functions:\n * - `provideCloudflareLoader`\n * - `provideCloudinaryLoader`\n * - `provideImageKitLoader`\n * - `provideImgixLoader`\n *\n * If you use a different image provider, you can create a custom loader function as described\n * below.\n *\n * To use a **custom loader**: provide your loader function as a value for the `IMAGE_LOADER` DI\n * token.\n *\n * ```typescript\n * import {IMAGE_LOADER, ImageLoaderConfig} from '@angular/common';\n *\n * // Configure the loader using the `IMAGE_LOADER` token.\n * providers: [\n *   {\n *      provide: IMAGE_LOADER,\n *      useValue: (config: ImageLoaderConfig) => {\n *        return `https://example.com/${config.src}-${config.width}.jpg}`;\n *      }\n *   },\n * ],\n * ```\n *\n * Step 3: update `<img>` tags in templates to use `ngSrc` instead of `src`.\n *\n * ```\n * <img ngSrc=\"logo.png\" width=\"200\" height=\"100\">\n * ```\n *\n * @publicApi\n */\n@Directive({\n  standalone: true,\n  selector: 'img[ngSrc]',\n  host: {\n    '[style.position]': 'fill ? \"absolute\" : null',\n    '[style.width]': 'fill ? \"100%\" : null',\n    '[style.height]': 'fill ? \"100%\" : null',\n    '[style.inset]': 'fill ? \"0px\" : null'\n  }\n})\nexport class NgOptimizedImage implements OnInit, OnChanges, OnDestroy {\n  private imageLoader = inject(IMAGE_LOADER);\n  private config: ImageConfig = processConfig(inject(IMAGE_CONFIG));\n  private renderer = inject(Renderer2);\n  private imgElement: HTMLImageElement = inject(ElementRef).nativeElement;\n  private injector = inject(Injector);\n  private readonly isServer = isPlatformServer(inject(PLATFORM_ID));\n  private readonly preloadLinkChecker = inject(PreloadLinkCreator);\n\n  // a LCP image observer - should be injected only in the dev mode\n  private lcpObserver = ngDevMode ? this.injector.get(LCPImageObserver) : null;\n\n  /**\n   * Calculate the rewritten `src` once and store it.\n   * This is needed to avoid repetitive calculations and make sure the directive cleanup in the\n   * `ngOnDestroy` does not rely on the `IMAGE_LOADER` logic (which in turn can rely on some other\n   * instance that might be already destroyed).\n   */\n  private _renderedSrc: string|null = null;\n\n  /**\n   * Name of the source image.\n   * Image name will be processed by the image loader and the final URL will be applied as the `src`\n   * property of the image.\n   */\n  @Input() ngSrc!: string;\n\n  /**\n   * A comma separated list of width or density descriptors.\n   * The image name will be taken from `ngSrc` and combined with the list of width or density\n   * descriptors to generate the final `srcset` property of the image.\n   *\n   * Example:\n   * ```\n   * <img ngSrc=\"hello.jpg\" ngSrcset=\"100w, 200w\" />  =>\n   * <img src=\"path/hello.jpg\" srcset=\"path/hello.jpg?w=100 100w, path/hello.jpg?w=200 200w\" />\n   * ```\n   */\n  @Input() ngSrcset!: string;\n\n  /**\n   * The base `sizes` attribute passed through to the `<img>` element.\n   * Providing sizes causes the image to create an automatic responsive srcset.\n   */\n  @Input() sizes?: string;\n\n  /**\n   * For responsive images: the intrinsic width of the image in pixels.\n   * For fixed size images: the desired rendered width of the image in pixels.\n   */\n  @Input()\n  set width(value: string|number|undefined) {\n    ngDevMode && assertGreaterThanZero(this, value, 'width');\n    this._width = inputToInteger(value);\n  }\n  get width(): number|undefined {\n    return this._width;\n  }\n  private _width?: number;\n\n  /**\n   * For responsive images: the intrinsic height of the image in pixels.\n   * For fixed size images: the desired rendered height of the image in pixels.* The intrinsic\n   * height of the image in pixels.\n   */\n  @Input()\n  set height(value: string|number|undefined) {\n    ngDevMode && assertGreaterThanZero(this, value, 'height');\n    this._height = inputToInteger(value);\n  }\n  get height(): number|undefined {\n    return this._height;\n  }\n  private _height?: number;\n\n  /**\n   * The desired loading behavior (lazy, eager, or auto).\n   *\n   * Setting images as loading='eager' or loading='auto' marks them\n   * as non-priority images. Avoid changing this input for priority images.\n   */\n  @Input() loading?: 'lazy'|'eager'|'auto';\n\n  /**\n   * Indicates whether this image should have a high priority.\n   */\n  @Input()\n  set priority(value: string|boolean|undefined) {\n    this._priority = inputToBoolean(value);\n  }\n  get priority(): boolean {\n    return this._priority;\n  }\n  private _priority = false;\n\n  /**\n   * Data to pass through to custom loaders.\n   */\n  @Input() loaderParams?: {[key: string]: any};\n\n  /**\n   * Disables automatic srcset generation for this image.\n   */\n  @Input()\n  set disableOptimizedSrcset(value: string|boolean|undefined) {\n    this._disableOptimizedSrcset = inputToBoolean(value);\n  }\n  get disableOptimizedSrcset(): boolean {\n    return this._disableOptimizedSrcset;\n  }\n  private _disableOptimizedSrcset = false;\n\n  /**\n   * Sets the image to \"fill mode\", which eliminates the height/width requirement and adds\n   * styles such that the image fills its containing element.\n   *\n   * @developerPreview\n   */\n  @Input()\n  set fill(value: string|boolean|undefined) {\n    this._fill = inputToBoolean(value);\n  }\n  get fill(): boolean {\n    return this._fill;\n  }\n  private _fill = false;\n\n  /**\n   * Value of the `src` attribute if set on the host `<img>` element.\n   * This input is exclusively read to assert that `src` is not set in conflict\n   * with `ngSrc` and that images don't start to load until a lazy loading strategy is set.\n   * @internal\n   */\n  @Input() src?: string;\n\n  /**\n   * Value of the `srcset` attribute if set on the host `<img>` element.\n   * This input is exclusively read to assert that `srcset` is not set in conflict\n   * with `ngSrcset` and that images don't start to load until a lazy loading strategy is set.\n   * @internal\n   */\n  @Input() srcset?: string;\n\n  /** @nodoc */\n  ngOnInit() {\n    if (ngDevMode) {\n      assertNonEmptyInput(this, 'ngSrc', this.ngSrc);\n      assertValidNgSrcset(this, this.ngSrcset);\n      assertNoConflictingSrc(this);\n      if (this.ngSrcset) {\n        assertNoConflictingSrcset(this);\n      }\n      assertNotBase64Image(this);\n      assertNotBlobUrl(this);\n      if (this.fill) {\n        assertEmptyWidthAndHeight(this);\n        assertNonZeroRenderedHeight(this, this.imgElement, this.renderer);\n      } else {\n        assertNonEmptyWidthAndHeight(this);\n        // Only check for distorted images when not in fill mode, where\n        // images may be intentionally stretched, cropped or letterboxed.\n        assertNoImageDistortion(this, this.imgElement, this.renderer);\n      }\n      assertValidLoadingInput(this);\n      if (!this.ngSrcset) {\n        assertNoComplexSizes(this);\n      }\n      assertNotMissingBuiltInLoader(this.ngSrc, this.imageLoader);\n      assertNoNgSrcsetWithoutLoader(this, this.imageLoader);\n      assertNoLoaderParamsWithoutLoader(this, this.imageLoader);\n      if (this.priority) {\n        const checker = this.injector.get(PreconnectLinkChecker);\n        checker.assertPreconnect(this.getRewrittenSrc(), this.ngSrc);\n      } else {\n        // Monitor whether an image is an LCP element only in case\n        // the `priority` attribute is missing. Otherwise, an image\n        // has the necessary settings and no extra checks are required.\n        if (this.lcpObserver !== null) {\n          const ngZone = this.injector.get(NgZone);\n          ngZone.runOutsideAngular(() => {\n            this.lcpObserver!.registerImage(this.getRewrittenSrc(), this.ngSrc);\n          });\n        }\n      }\n    }\n    this.setHostAttributes();\n  }\n\n  private setHostAttributes() {\n    // Must set width/height explicitly in case they are bound (in which case they will\n    // only be reflected and not found by the browser)\n    if (this.fill) {\n      if (!this.sizes) {\n        this.sizes = '100vw';\n      }\n    } else {\n      this.setHostAttribute('width', this.width!.toString());\n      this.setHostAttribute('height', this.height!.toString());\n    }\n\n    this.setHostAttribute('loading', this.getLoadingBehavior());\n    this.setHostAttribute('fetchpriority', this.getFetchPriority());\n\n    // The `data-ng-img` attribute flags an image as using the directive, to allow\n    // for analysis of the directive's performance.\n    this.setHostAttribute('ng-img', 'true');\n\n    // The `src` and `srcset` attributes should be set last since other attributes\n    // could affect the image's loading behavior.\n    const rewrittenSrc = this.getRewrittenSrc();\n    this.setHostAttribute('src', rewrittenSrc);\n\n    let rewrittenSrcset: string|undefined = undefined;\n\n    if (this.sizes) {\n      this.setHostAttribute('sizes', this.sizes);\n    }\n\n    if (this.ngSrcset) {\n      rewrittenSrcset = this.getRewrittenSrcset();\n    } else if (this.shouldGenerateAutomaticSrcset()) {\n      rewrittenSrcset = this.getAutomaticSrcset();\n    }\n\n    if (rewrittenSrcset) {\n      this.setHostAttribute('srcset', rewrittenSrcset);\n    }\n\n    if (this.isServer && this.priority) {\n      this.preloadLinkChecker.createPreloadLinkTag(\n          this.renderer, rewrittenSrc, rewrittenSrcset, this.sizes);\n    }\n  }\n\n  /** @nodoc */\n  ngOnChanges(changes: SimpleChanges) {\n    if (ngDevMode) {\n      assertNoPostInitInputChange(this, changes, [\n        'ngSrc',\n        'ngSrcset',\n        'width',\n        'height',\n        'priority',\n        'fill',\n        'loading',\n        'sizes',\n        'loaderParams',\n        'disableOptimizedSrcset',\n      ]);\n    }\n  }\n\n  private callImageLoader(configWithoutCustomParams: Omit<ImageLoaderConfig, 'loaderParams'>):\n      string {\n    let augmentedConfig: ImageLoaderConfig = configWithoutCustomParams;\n    if (this.loaderParams) {\n      augmentedConfig.loaderParams = this.loaderParams;\n    }\n    return this.imageLoader(augmentedConfig);\n  }\n\n  private getLoadingBehavior(): string {\n    if (!this.priority && this.loading !== undefined) {\n      return this.loading;\n    }\n    return this.priority ? 'eager' : 'lazy';\n  }\n\n  private getFetchPriority(): string {\n    return this.priority ? 'high' : 'auto';\n  }\n\n  private getRewrittenSrc(): string {\n    // ImageLoaderConfig supports setting a width property. However, we're not setting width here\n    // because if the developer uses rendered width instead of intrinsic width in the HTML width\n    // attribute, the image requested may be too small for 2x+ screens.\n    if (!this._renderedSrc) {\n      const imgConfig = {src: this.ngSrc};\n      // Cache calculated image src to reuse it later in the code.\n      this._renderedSrc = this.callImageLoader(imgConfig);\n    }\n    return this._renderedSrc;\n  }\n\n  private getRewrittenSrcset(): string {\n    const widthSrcSet = VALID_WIDTH_DESCRIPTOR_SRCSET.test(this.ngSrcset);\n    const finalSrcs = this.ngSrcset.split(',').filter(src => src !== '').map(srcStr => {\n      srcStr = srcStr.trim();\n      const width = widthSrcSet ? parseFloat(srcStr) : parseFloat(srcStr) * this.width!;\n      return `${this.callImageLoader({src: this.ngSrc, width})} ${srcStr}`;\n    });\n    return finalSrcs.join(', ');\n  }\n\n  private getAutomaticSrcset(): string {\n    if (this.sizes) {\n      return this.getResponsiveSrcset();\n    } else {\n      return this.getFixedSrcset();\n    }\n  }\n\n  private getResponsiveSrcset(): string {\n    const {breakpoints} = this.config;\n\n    let filteredBreakpoints = breakpoints!;\n    if (this.sizes?.trim() === '100vw') {\n      // Since this is a full-screen-width image, our srcset only needs to include\n      // breakpoints with full viewport widths.\n      filteredBreakpoints = breakpoints!.filter(bp => bp >= VIEWPORT_BREAKPOINT_CUTOFF);\n    }\n\n    const finalSrcs = filteredBreakpoints.map(\n        bp => `${this.callImageLoader({src: this.ngSrc, width: bp})} ${bp}w`);\n    return finalSrcs.join(', ');\n  }\n\n  private getFixedSrcset(): string {\n    const finalSrcs = DENSITY_SRCSET_MULTIPLIERS.map(multiplier => {\n      const imgUrl = this.callImageLoader({src: this.ngSrc, width: this.width! * multiplier});\n      return `${imgUrl} ${multiplier}x`;\n    });\n    return finalSrcs.join(', ');\n  }\n\n  private shouldGenerateAutomaticSrcset(): boolean {\n    return !this._disableOptimizedSrcset && !this.srcset && this.imageLoader !== noopImageLoader &&\n        !(this.width! > FIXED_SRCSET_WIDTH_LIMIT || this.height! > FIXED_SRCSET_HEIGHT_LIMIT);\n  }\n\n  /** @nodoc */\n  ngOnDestroy() {\n    if (ngDevMode) {\n      if (!this.priority && this._renderedSrc !== null && this.lcpObserver !== null) {\n        this.lcpObserver.unregisterImage(this._renderedSrc);\n      }\n    }\n  }\n\n  private setHostAttribute(name: string, value: string): void {\n    this.renderer.setAttribute(this.imgElement, name, value);\n  }\n}\n\n/***** Helpers *****/\n\n/**\n * Convert input value to integer.\n */\nfunction inputToInteger(value: string|number|undefined): number|undefined {\n  return typeof value === 'string' ? parseInt(value, 10) : value;\n}\n\n/**\n * Convert input value to boolean.\n */\nfunction inputToBoolean(value: unknown): boolean {\n  return value != null && `${value}` !== 'false';\n}\n\n/**\n * Sorts provided config breakpoints and uses defaults.\n */\nfunction processConfig(config: ImageConfig): ImageConfig {\n  let sortedBreakpoints: {breakpoints?: number[]} = {};\n  if (config.breakpoints) {\n    sortedBreakpoints.breakpoints = config.breakpoints.sort((a, b) => a - b);\n  }\n  return Object.assign({}, defaultConfig, config, sortedBreakpoints);\n}\n\n/***** Assert functions *****/\n\n/**\n * Verifies that there is no `src` set on a host element.\n */\nfunction assertNoConflictingSrc(dir: NgOptimizedImage) {\n  if (dir.src) {\n    throw new RuntimeError(\n        RuntimeErrorCode.UNEXPECTED_SRC_ATTR,\n        `${imgDirectiveDetails(dir.ngSrc)} both \\`src\\` and \\`ngSrc\\` have been set. ` +\n            `Supplying both of these attributes breaks lazy loading. ` +\n            `The NgOptimizedImage directive sets \\`src\\` itself based on the value of \\`ngSrc\\`. ` +\n            `To fix this, please remove the \\`src\\` attribute.`);\n  }\n}\n\n/**\n * Verifies that there is no `srcset` set on a host element.\n */\nfunction assertNoConflictingSrcset(dir: NgOptimizedImage) {\n  if (dir.srcset) {\n    throw new RuntimeError(\n        RuntimeErrorCode.UNEXPECTED_SRCSET_ATTR,\n        `${imgDirectiveDetails(dir.ngSrc)} both \\`srcset\\` and \\`ngSrcset\\` have been set. ` +\n            `Supplying both of these attributes breaks lazy loading. ` +\n            `The NgOptimizedImage directive sets \\`srcset\\` itself based on the value of ` +\n            `\\`ngSrcset\\`. To fix this, please remove the \\`srcset\\` attribute.`);\n  }\n}\n\n/**\n * Verifies that the `ngSrc` is not a Base64-encoded image.\n */\nfunction assertNotBase64Image(dir: NgOptimizedImage) {\n  let ngSrc = dir.ngSrc.trim();\n  if (ngSrc.startsWith('data:')) {\n    if (ngSrc.length > BASE64_IMG_MAX_LENGTH_IN_ERROR) {\n      ngSrc = ngSrc.substring(0, BASE64_IMG_MAX_LENGTH_IN_ERROR) + '...';\n    }\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc, false)} \\`ngSrc\\` is a Base64-encoded string ` +\n            `(${ngSrc}). NgOptimizedImage does not support Base64-encoded strings. ` +\n            `To fix this, disable the NgOptimizedImage directive for this element ` +\n            `by removing \\`ngSrc\\` and using a standard \\`src\\` attribute instead.`);\n  }\n}\n\n/**\n * Verifies that the 'sizes' only includes responsive values.\n */\nfunction assertNoComplexSizes(dir: NgOptimizedImage) {\n  let sizes = dir.sizes;\n  if (sizes?.match(/((\\)|,)\\s|^)\\d+px/)) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc, false)} \\`sizes\\` was set to a string including ` +\n            `pixel values. For automatic \\`srcset\\` generation, \\`sizes\\` must only include responsive ` +\n            `values, such as \\`sizes=\"50vw\"\\` or \\`sizes=\"(min-width: 768px) 50vw, 100vw\"\\`. ` +\n            `To fix this, modify the \\`sizes\\` attribute, or provide your own \\`ngSrcset\\` value directly.`);\n  }\n}\n\n/**\n * Verifies that the `ngSrc` is not a Blob URL.\n */\nfunction assertNotBlobUrl(dir: NgOptimizedImage) {\n  const ngSrc = dir.ngSrc.trim();\n  if (ngSrc.startsWith('blob:')) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc)} \\`ngSrc\\` was set to a blob URL (${ngSrc}). ` +\n            `Blob URLs are not supported by the NgOptimizedImage directive. ` +\n            `To fix this, disable the NgOptimizedImage directive for this element ` +\n            `by removing \\`ngSrc\\` and using a regular \\`src\\` attribute instead.`);\n  }\n}\n\n/**\n * Verifies that the input is set to a non-empty string.\n */\nfunction assertNonEmptyInput(dir: NgOptimizedImage, name: string, value: unknown) {\n  const isString = typeof value === 'string';\n  const isEmptyString = isString && value.trim() === '';\n  if (!isString || isEmptyString) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc)} \\`${name}\\` has an invalid value ` +\n            `(\\`${value}\\`). To fix this, change the value to a non-empty string.`);\n  }\n}\n\n/**\n * Verifies that the `ngSrcset` is in a valid format, e.g. \"100w, 200w\" or \"1x, 2x\".\n */\nexport function assertValidNgSrcset(dir: NgOptimizedImage, value: unknown) {\n  if (value == null) return;\n  assertNonEmptyInput(dir, 'ngSrcset', value);\n  const stringVal = value as string;\n  const isValidWidthDescriptor = VALID_WIDTH_DESCRIPTOR_SRCSET.test(stringVal);\n  const isValidDensityDescriptor = VALID_DENSITY_DESCRIPTOR_SRCSET.test(stringVal);\n\n  if (isValidDensityDescriptor) {\n    assertUnderDensityCap(dir, stringVal);\n  }\n\n  const isValidSrcset = isValidWidthDescriptor || isValidDensityDescriptor;\n  if (!isValidSrcset) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc)} \\`ngSrcset\\` has an invalid value (\\`${value}\\`). ` +\n            `To fix this, supply \\`ngSrcset\\` using a comma-separated list of one or more width ` +\n            `descriptors (e.g. \"100w, 200w\") or density descriptors (e.g. \"1x, 2x\").`);\n  }\n}\n\nfunction assertUnderDensityCap(dir: NgOptimizedImage, value: string) {\n  const underDensityCap =\n      value.split(',').every(num => num === '' || parseFloat(num) <= ABSOLUTE_SRCSET_DENSITY_CAP);\n  if (!underDensityCap) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${\n            imgDirectiveDetails(\n                dir.ngSrc)} the \\`ngSrcset\\` contains an unsupported image density:` +\n            `\\`${value}\\`. NgOptimizedImage generally recommends a max image density of ` +\n            `${RECOMMENDED_SRCSET_DENSITY_CAP}x but supports image densities up to ` +\n            `${ABSOLUTE_SRCSET_DENSITY_CAP}x. The human eye cannot distinguish between image densities ` +\n            `greater than ${RECOMMENDED_SRCSET_DENSITY_CAP}x - which makes them unnecessary for ` +\n            `most use cases. Images that will be pinch-zoomed are typically the primary use case for ` +\n            `${ABSOLUTE_SRCSET_DENSITY_CAP}x images. Please remove the high density descriptor and try again.`);\n  }\n}\n\n/**\n * Creates a `RuntimeError` instance to represent a situation when an input is set after\n * the directive has initialized.\n */\nfunction postInitInputChangeError(dir: NgOptimizedImage, inputName: string): {} {\n  let reason!: string;\n  if (inputName === 'width' || inputName === 'height') {\n    reason = `Changing \\`${inputName}\\` may result in different attribute value ` +\n        `applied to the underlying image element and cause layout shifts on a page.`;\n  } else {\n    reason = `Changing the \\`${inputName}\\` would have no effect on the underlying ` +\n        `image element, because the resource loading has already occurred.`;\n  }\n  return new RuntimeError(\n      RuntimeErrorCode.UNEXPECTED_INPUT_CHANGE,\n      `${imgDirectiveDetails(dir.ngSrc)} \\`${inputName}\\` was updated after initialization. ` +\n          `The NgOptimizedImage directive will not react to this input change. ${reason} ` +\n          `To fix this, either switch \\`${inputName}\\` to a static value ` +\n          `or wrap the image element in an *ngIf that is gated on the necessary value.`);\n}\n\n/**\n * Verify that none of the listed inputs has changed.\n */\nfunction assertNoPostInitInputChange(\n    dir: NgOptimizedImage, changes: SimpleChanges, inputs: string[]) {\n  inputs.forEach(input => {\n    const isUpdated = changes.hasOwnProperty(input);\n    if (isUpdated && !changes[input].isFirstChange()) {\n      if (input === 'ngSrc') {\n        // When the `ngSrc` input changes, we detect that only in the\n        // `ngOnChanges` hook, thus the `ngSrc` is already set. We use\n        // `ngSrc` in the error message, so we use a previous value, but\n        // not the updated one in it.\n        dir = {ngSrc: changes[input].previousValue} as NgOptimizedImage;\n      }\n      throw postInitInputChangeError(dir, input);\n    }\n  });\n}\n\n/**\n * Verifies that a specified input is a number greater than 0.\n */\nfunction assertGreaterThanZero(dir: NgOptimizedImage, inputValue: unknown, inputName: string) {\n  const validNumber = typeof inputValue === 'number' && inputValue > 0;\n  const validString =\n      typeof inputValue === 'string' && /^\\d+$/.test(inputValue.trim()) && parseInt(inputValue) > 0;\n  if (!validNumber && !validString) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc)} \\`${inputName}\\` has an invalid value ` +\n            `(\\`${inputValue}\\`). To fix this, provide \\`${inputName}\\` ` +\n            `as a number greater than 0.`);\n  }\n}\n\n/**\n * Verifies that the rendered image is not visually distorted. Effectively this is checking:\n * - Whether the \"width\" and \"height\" attributes reflect the actual dimensions of the image.\n * - Whether image styling is \"correct\" (see below for a longer explanation).\n */\nfunction assertNoImageDistortion(\n    dir: NgOptimizedImage, img: HTMLImageElement, renderer: Renderer2) {\n  const removeListenerFn = renderer.listen(img, 'load', () => {\n    removeListenerFn();\n    const renderedWidth = img.clientWidth;\n    const renderedHeight = img.clientHeight;\n    const renderedAspectRatio = renderedWidth / renderedHeight;\n    const nonZeroRenderedDimensions = renderedWidth !== 0 && renderedHeight !== 0;\n\n    const intrinsicWidth = img.naturalWidth;\n    const intrinsicHeight = img.naturalHeight;\n    const intrinsicAspectRatio = intrinsicWidth / intrinsicHeight;\n\n    const suppliedWidth = dir.width!;\n    const suppliedHeight = dir.height!;\n    const suppliedAspectRatio = suppliedWidth / suppliedHeight;\n\n    // Tolerance is used to account for the impact of subpixel rendering.\n    // Due to subpixel rendering, the rendered, intrinsic, and supplied\n    // aspect ratios of a correctly configured image may not exactly match.\n    // For example, a `width=4030 height=3020` image might have a rendered\n    // size of \"1062w, 796.48h\". (An aspect ratio of 1.334... vs. 1.333...)\n    const inaccurateDimensions =\n        Math.abs(suppliedAspectRatio - intrinsicAspectRatio) > ASPECT_RATIO_TOLERANCE;\n    const stylingDistortion = nonZeroRenderedDimensions &&\n        Math.abs(intrinsicAspectRatio - renderedAspectRatio) > ASPECT_RATIO_TOLERANCE;\n\n    if (inaccurateDimensions) {\n      console.warn(formatRuntimeError(\n          RuntimeErrorCode.INVALID_INPUT,\n          `${imgDirectiveDetails(dir.ngSrc)} the aspect ratio of the image does not match ` +\n              `the aspect ratio indicated by the width and height attributes. ` +\n              `\\nIntrinsic image size: ${intrinsicWidth}w x ${intrinsicHeight}h ` +\n              `(aspect-ratio: ${intrinsicAspectRatio}). \\nSupplied width and height attributes: ` +\n              `${suppliedWidth}w x ${suppliedHeight}h (aspect-ratio: ${suppliedAspectRatio}). ` +\n              `\\nTo fix this, update the width and height attributes.`));\n    } else if (stylingDistortion) {\n      console.warn(formatRuntimeError(\n          RuntimeErrorCode.INVALID_INPUT,\n          `${imgDirectiveDetails(dir.ngSrc)} the aspect ratio of the rendered image ` +\n              `does not match the image's intrinsic aspect ratio. ` +\n              `\\nIntrinsic image size: ${intrinsicWidth}w x ${intrinsicHeight}h ` +\n              `(aspect-ratio: ${intrinsicAspectRatio}). \\nRendered image size: ` +\n              `${renderedWidth}w x ${renderedHeight}h (aspect-ratio: ` +\n              `${renderedAspectRatio}). \\nThis issue can occur if \"width\" and \"height\" ` +\n              `attributes are added to an image without updating the corresponding ` +\n              `image styling. To fix this, adjust image styling. In most cases, ` +\n              `adding \"height: auto\" or \"width: auto\" to the image styling will fix ` +\n              `this issue.`));\n    } else if (!dir.ngSrcset && nonZeroRenderedDimensions) {\n      // If `ngSrcset` hasn't been set, sanity check the intrinsic size.\n      const recommendedWidth = RECOMMENDED_SRCSET_DENSITY_CAP * renderedWidth;\n      const recommendedHeight = RECOMMENDED_SRCSET_DENSITY_CAP * renderedHeight;\n      const oversizedWidth = (intrinsicWidth - recommendedWidth) >= OVERSIZED_IMAGE_TOLERANCE;\n      const oversizedHeight = (intrinsicHeight - recommendedHeight) >= OVERSIZED_IMAGE_TOLERANCE;\n      if (oversizedWidth || oversizedHeight) {\n        console.warn(formatRuntimeError(\n            RuntimeErrorCode.OVERSIZED_IMAGE,\n            `${imgDirectiveDetails(dir.ngSrc)} the intrinsic image is significantly ` +\n                `larger than necessary. ` +\n                `\\nRendered image size: ${renderedWidth}w x ${renderedHeight}h. ` +\n                `\\nIntrinsic image size: ${intrinsicWidth}w x ${intrinsicHeight}h. ` +\n                `\\nRecommended intrinsic image size: ${recommendedWidth}w x ${\n                    recommendedHeight}h. ` +\n                `\\nNote: Recommended intrinsic image size is calculated assuming a maximum DPR of ` +\n                `${RECOMMENDED_SRCSET_DENSITY_CAP}. To improve loading time, resize the image ` +\n                `or consider using the \"ngSrcset\" and \"sizes\" attributes.`));\n      }\n    }\n  });\n}\n\n/**\n * Verifies that a specified input is set.\n */\nfunction assertNonEmptyWidthAndHeight(dir: NgOptimizedImage) {\n  let missingAttributes = [];\n  if (dir.width === undefined) missingAttributes.push('width');\n  if (dir.height === undefined) missingAttributes.push('height');\n  if (missingAttributes.length > 0) {\n    throw new RuntimeError(\n        RuntimeErrorCode.REQUIRED_INPUT_MISSING,\n        `${imgDirectiveDetails(dir.ngSrc)} these required attributes ` +\n            `are missing: ${missingAttributes.map(attr => `\"${attr}\"`).join(', ')}. ` +\n            `Including \"width\" and \"height\" attributes will prevent image-related layout shifts. ` +\n            `To fix this, include \"width\" and \"height\" attributes on the image tag or turn on ` +\n            `\"fill\" mode with the \\`fill\\` attribute.`);\n  }\n}\n\n/**\n * Verifies that width and height are not set. Used in fill mode, where those attributes don't make\n * sense.\n */\nfunction assertEmptyWidthAndHeight(dir: NgOptimizedImage) {\n  if (dir.width || dir.height) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${\n            imgDirectiveDetails(\n                dir.ngSrc)} the attributes \\`height\\` and/or \\`width\\` are present ` +\n            `along with the \\`fill\\` attribute. Because \\`fill\\` mode causes an image to fill its containing ` +\n            `element, the size attributes have no effect and should be removed.`);\n  }\n}\n\n/**\n * Verifies that the rendered image has a nonzero height. If the image is in fill mode, provides\n * guidance that this can be caused by the containing element's CSS position property.\n */\nfunction assertNonZeroRenderedHeight(\n    dir: NgOptimizedImage, img: HTMLImageElement, renderer: Renderer2) {\n  const removeListenerFn = renderer.listen(img, 'load', () => {\n    removeListenerFn();\n    const renderedHeight = img.clientHeight;\n    if (dir.fill && renderedHeight === 0) {\n      console.warn(formatRuntimeError(\n          RuntimeErrorCode.INVALID_INPUT,\n          `${imgDirectiveDetails(dir.ngSrc)} the height of the fill-mode image is zero. ` +\n              `This is likely because the containing element does not have the CSS 'position' ` +\n              `property set to one of the following: \"relative\", \"fixed\", or \"absolute\". ` +\n              `To fix this problem, make sure the container element has the CSS 'position' ` +\n              `property defined and the height of the element is not zero.`));\n    }\n  });\n}\n\n/**\n * Verifies that the `loading` attribute is set to a valid input &\n * is not used on priority images.\n */\nfunction assertValidLoadingInput(dir: NgOptimizedImage) {\n  if (dir.loading && dir.priority) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc)} the \\`loading\\` attribute ` +\n            `was used on an image that was marked \"priority\". ` +\n            `Setting \\`loading\\` on priority images is not allowed ` +\n            `because these images will always be eagerly loaded. ` +\n            `To fix this, remove the “loading” attribute from the priority image.`);\n  }\n  const validInputs = ['auto', 'eager', 'lazy'];\n  if (typeof dir.loading === 'string' && !validInputs.includes(dir.loading)) {\n    throw new RuntimeError(\n        RuntimeErrorCode.INVALID_INPUT,\n        `${imgDirectiveDetails(dir.ngSrc)} the \\`loading\\` attribute ` +\n            `has an invalid value (\\`${dir.loading}\\`). ` +\n            `To fix this, provide a valid value (\"lazy\", \"eager\", or \"auto\").`);\n  }\n}\n\n/**\n * Warns if NOT using a loader (falling back to the generic loader) and\n * the image appears to be hosted on one of the image CDNs for which\n * we do have a built-in image loader. Suggests switching to the\n * built-in loader.\n *\n * @param ngSrc Value of the ngSrc attribute\n * @param imageLoader ImageLoader provided\n */\nfunction assertNotMissingBuiltInLoader(ngSrc: string, imageLoader: ImageLoader) {\n  if (imageLoader === noopImageLoader) {\n    let builtInLoaderName = '';\n    for (const loader of BUILT_IN_LOADERS) {\n      if (loader.testUrl(ngSrc)) {\n        builtInLoaderName = loader.name;\n        break;\n      }\n    }\n    if (builtInLoaderName) {\n      console.warn(formatRuntimeError(\n          RuntimeErrorCode.MISSING_BUILTIN_LOADER,\n          `NgOptimizedImage: It looks like your images may be hosted on the ` +\n              `${builtInLoaderName} CDN, but your app is not using Angular's ` +\n              `built-in loader for that CDN. We recommend switching to use ` +\n              `the built-in by calling \\`provide${builtInLoaderName}Loader()\\` ` +\n              `in your \\`providers\\` and passing it your instance's base URL. ` +\n              `If you don't want to use the built-in loader, define a custom ` +\n              `loader function using IMAGE_LOADER to silence this warning.`));\n    }\n  }\n}\n\n/**\n * Warns if ngSrcset is present and no loader is configured (i.e. the default one is being used).\n */\nfunction assertNoNgSrcsetWithoutLoader(dir: NgOptimizedImage, imageLoader: ImageLoader) {\n  if (dir.ngSrcset && imageLoader === noopImageLoader) {\n    console.warn(formatRuntimeError(\n        RuntimeErrorCode.MISSING_NECESSARY_LOADER,\n        `${imgDirectiveDetails(dir.ngSrc)} the \\`ngSrcset\\` attribute is present but ` +\n            `no image loader is configured (i.e. the default one is being used), ` +\n            `which would result in the same image being used for all configured sizes. ` +\n            `To fix this, provide a loader or remove the \\`ngSrcset\\` attribute from the image.`));\n  }\n}\n\n/**\n * Warns if loaderParams is present and no loader is configured (i.e. the default one is being\n * used).\n */\nfunction assertNoLoaderParamsWithoutLoader(dir: NgOptimizedImage, imageLoader: ImageLoader) {\n  if (dir.loaderParams && imageLoader === noopImageLoader) {\n    console.warn(formatRuntimeError(\n        RuntimeErrorCode.MISSING_NECESSARY_LOADER,\n        `${imgDirectiveDetails(dir.ngSrc)} the \\`loaderParams\\` attribute is present but ` +\n            `no image loader is configured (i.e. the default one is being used), ` +\n            `which means that the loaderParams data will not be consumed and will not affect the URL. ` +\n            `To fix this, provide a custom loader or remove the \\`loaderParams\\` attribute from the image.`));\n  }\n}\n"]}