webpack/lib/asset/AssetGenerator.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Sergey Melyukov @smelukov
*/

"use strict";

const path = require("path");
const { RawSource } = require("webpack-sources");
const ConcatenationScope = require("../ConcatenationScope");
const Generator = require("../Generator");
const {
	ASSET_AND_ASSET_URL_TYPES,
	ASSET_AND_JAVASCRIPT_AND_ASSET_URL_TYPES,
	ASSET_AND_JAVASCRIPT_TYPES,
	ASSET_TYPES,
	ASSET_URL_TYPE,
	ASSET_URL_TYPES,
	CSS_TYPE,
	HTML_TYPE,
	JAVASCRIPT_AND_ASSET_URL_TYPES,
	JAVASCRIPT_TYPE,
	JAVASCRIPT_TYPES,
	NO_TYPES
} = require("../ModuleSourceTypeConstants");
const {
	ASSET_MODULE_TYPE,
	ASSET_MODULE_TYPE_WEBMANIFEST
} = require("../ModuleTypeConstants");
const RuntimeGlobals = require("../RuntimeGlobals");
const createHash = require("../util/createHash");
const { makePathsRelative } = require("../util/identifier");
const memoize = require("../util/memoize");
const nonNumericOnlyHash = require("../util/nonNumericOnlyHash");
const {
	PUBLIC_PATH_AUTO,
	PUBLIC_PATH_FULL_HASH
} = require("../util/publicPathPlaceholder");
const { updateHashFromSource } = require("../util/source");

const getMimeTypes = memoize(() => require("../util/mimeTypes"));

/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../../declarations/WebpackOptions").AssetGeneratorDataUrlOptions} AssetGeneratorDataUrlOptions */
/** @typedef {import("../../declarations/WebpackOptions").AssetGeneratorOptions} AssetGeneratorOptions */
/** @typedef {import("../../declarations/WebpackOptions").AssetModuleFilename} AssetModuleFilename */
/** @typedef {import("../../declarations/WebpackOptions").AssetModuleOutputPath} AssetModuleOutputPath */
/** @typedef {import("../../declarations/WebpackOptions").AssetResourceGeneratorOptions} AssetResourceGeneratorOptions */
/** @typedef {import("../../declarations/WebpackOptions").RawPublicPath} RawPublicPath */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Compilation").AssetInfo} AssetInfo */
/** @typedef {import("../Generator").GenerateContext} GenerateContext */
/** @typedef {import("../Generator").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../Module").NameForCondition} NameForCondition */
/** @typedef {import("./AssetModule").AssetModuleBuildInfo} AssetModuleBuildInfo */
/** @typedef {import("../Module").ConcatenationBailoutReasonContext} ConcatenationBailoutReasonContext */
/** @typedef {import("../Module").SourceType} SourceType */
/** @typedef {import("../Module").SourceTypes} SourceTypes */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../NormalModule")} NormalModule */
/** @typedef {import("../dependencies/URLDependency")} URLDependency */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */

/** @typedef {(source: string | Buffer, context: { filename: string, module: Module }) => string} DataUrlFunction */

// slash separating a module type from its subtype (`css/auto` -> `css`)
const TYPE_SEPARATOR_CHAR_CODE = 47;

/**
 * Whether a module type's prefix (the part before `/`) equals `prefix`, without
 * allocating the substring `type.split("/")[0]` would produce.
 * @param {string} type module type (e.g. `javascript/auto`)
 * @param {string} prefix expected prefix (e.g. `javascript`)
 * @returns {boolean} whether the type's prefix equals `prefix`
 */
const typePrefixEquals = (type, prefix) =>
	type.startsWith(prefix) &&
	(type.length === prefix.length ||
		type.charCodeAt(prefix.length) === TYPE_SEPARATOR_CHAR_CODE);

/**
 * Merges maybe arrays.
 * @template T
 * @template U
 * @param {null | string | T[] | Set<T> | undefined} a a
 * @param {null | string | U[] | Set<U> | undefined} b b
 * @returns {T[] & U[]} array
 */
const mergeMaybeArrays = (a, b) => {
	/** @type {Set<T | U | null | undefined | string | Set<T> | Set<U>>} */
	const set = new Set();
	if (Array.isArray(a)) for (const item of a) set.add(item);
	else set.add(a);
	if (Array.isArray(b)) for (const item of b) set.add(item);
	else set.add(b);
	return /** @type {T[] & U[]} */ ([.../** @type {Set<T | U>} */ (set)]);
};

/**
 * Merges the provided values into a single result.
 * @param {AssetInfo} a a
 * @param {AssetInfo} b b
 * @returns {AssetInfo} object
 */
const mergeAssetInfo = (a, b) => {
	/** @type {AssetInfo} */
	const result = { ...a, ...b };
	for (const key of Object.keys(a)) {
		if (key in b) {
			if (a[key] === b[key]) continue;
			switch (key) {
				case "fullhash":
				case "chunkhash":
				case "modulehash":
				case "contenthash":
					result[key] = mergeMaybeArrays(a[key], b[key]);
					break;
				case "immutable":
				case "development":
				case "hotModuleReplacement":
				case "javascriptModule":
					result[key] = a[key] || b[key];
					break;
				case "related":
					result[key] = mergeRelatedInfo(
						/** @type {NonNullable<AssetInfo["related"]>} */
						(a[key]),
						/** @type {NonNullable<AssetInfo["related"]>} */
						(b[key])
					);
					break;
				default:
					throw new Error(`Can't handle conflicting asset info for ${key}`);
			}
		}
	}
	return result;
};

/**
 * Merges related info.
 * @param {NonNullable<AssetInfo["related"]>} a a
 * @param {NonNullable<AssetInfo["related"]>} b b
 * @returns {NonNullable<AssetInfo["related"]>} object
 */
const mergeRelatedInfo = (a, b) => {
	const result = { ...a, ...b };
	for (const key of Object.keys(a)) {
		if (key in b) {
			if (a[key] === b[key]) continue;
			result[key] = mergeMaybeArrays(a[key], b[key]);
		}
	}
	return result;
};

/**
 * Encodes the provided encoding.
 * @param {"base64" | false} encoding encoding
 * @param {Source} source source
 * @returns {string} encoded data
 */
const encodeDataUri = (encoding, source) => {
	/** @type {string | undefined} */
	let encodedContent;

	switch (encoding) {
		case "base64": {
			encodedContent = source.buffer().toString("base64");
			break;
		}
		case false: {
			const content = source.source();

			encodedContent =
				typeof content === "string" ? content : content.toString("utf8");

			encodedContent = encodeURIComponent(encodedContent).replace(
				/[!'()*]/g,
				(character) =>
					`%${/** @type {number} */ (character.codePointAt(0)).toString(16)}`
			);
			break;
		}
		default:
			throw new Error(`Unsupported encoding '${encoding}'`);
	}

	return encodedContent;
};

/**
 * Decodes data uri content.
 * @param {"base64" | false} encoding encoding
 * @param {string} content content
 * @returns {Buffer} decoded content
 */
const decodeDataUriContent = (encoding, content) => {
	const isBase64 = encoding === "base64";

	if (isBase64) {
		return Buffer.from(content, "base64");
	}

	// If we can't decode return the original body
	try {
		return Buffer.from(decodeURIComponent(content), "utf8");
	} catch (_) {
		return Buffer.from(content, "utf8");
	}
};

const DEFAULT_ENCODING = "base64";

class AssetGenerator extends Generator {
	/**
	 * Creates an instance of AssetGenerator.
	 * @param {ModuleGraph} moduleGraph the module graph
	 * @param {AssetGeneratorOptions["dataUrl"]=} dataUrlOptions the options for the data url
	 * @param {AssetModuleFilename=} filename override for output.assetModuleFilename
	 * @param {RawPublicPath=} publicPath override for output.assetModulePublicPath
	 * @param {AssetModuleOutputPath=} outputPath the output path for the emitted file which is not included in the runtime import
	 * @param {boolean=} emit generate output asset
	 * @param {Compilation=} compilation the compilation (`getTypes` has no generate context, so the analyzable-output decision reads `output.module`/`output.publicPath` from here)
	 */
	constructor(
		moduleGraph,
		dataUrlOptions,
		filename,
		publicPath,
		outputPath,
		emit,
		compilation
	) {
		super();
		/** @type {AssetGeneratorOptions["dataUrl"] | undefined} */
		this.dataUrlOptions = dataUrlOptions;
		/** @type {AssetModuleFilename | undefined} */
		this.filename = filename;
		/** @type {RawPublicPath | undefined} */
		this.publicPath = publicPath;
		/** @type {AssetModuleOutputPath | undefined} */
		this.outputPath = outputPath;
		/** @type {boolean | undefined} */
		this.emit = emit;
		/** @type {Compilation | undefined} */
		this._compilation = compilation;
		/** @type {ModuleGraph} */
		this._moduleGraph = moduleGraph;
	}

	/**
	 * Gets source file name.
	 * @param {NormalModule} module module
	 * @param {RuntimeTemplate} runtimeTemplate runtime template
	 * @returns {string} source file name
	 */
	static getSourceFileName(module, runtimeTemplate) {
		return makePathsRelative(
			runtimeTemplate.compilation.compiler.context,
			/** @type {string} */
			(module.getResource()),
			runtimeTemplate.compilation.compiler.root
		).replace(/^\.\//, "");
	}

	/**
	 * Gets full content hash.
	 * @param {NormalModule} module module
	 * @param {RuntimeTemplate} runtimeTemplate runtime template
	 * @returns {[string, string]} return full hash and non-numeric full hash
	 */
	static getFullContentHash(module, runtimeTemplate) {
		const hash = createHash(runtimeTemplate.outputOptions.hashFunction);

		if (runtimeTemplate.outputOptions.hashSalt) {
			hash.update(runtimeTemplate.outputOptions.hashSalt);
		}

		const source = module.originalSource();

		if (source) {
			updateHashFromSource(hash, source);
		}

		if (module.error) {
			hash.update(module.error.toString());
		}

		const fullContentHash = hash.digest(
			runtimeTemplate.outputOptions.hashDigest
		);

		const contentHash = nonNumericOnlyHash(
			fullContentHash,
			runtimeTemplate.outputOptions.hashDigestLength
		);

		return [fullContentHash, contentHash];
	}

	/**
	 * Gets filename with info.
	 * @param {NormalModule} module module for which the code should be generated
	 * @param {Pick<AssetResourceGeneratorOptions, "filename" | "outputPath">} generatorOptions generator options
	 * @param {{ runtime: RuntimeSpec, runtimeTemplate: RuntimeTemplate, chunkGraph: ChunkGraph }} generateContext context for generate
	 * @param {string} contentHash the content hash
	 * @param {string=} fullContentHash untruncated content hash, so `[contenthash:<digest>]` re-encodes from full entropy
	 * @returns {{ filename: string, originalFilename: string, assetInfo: AssetInfo }} info
	 */
	static getFilenameWithInfo(
		module,
		generatorOptions,
		{ runtime, runtimeTemplate, chunkGraph },
		contentHash,
		fullContentHash
	) {
		const assetModuleFilename =
			generatorOptions.filename ||
			runtimeTemplate.outputOptions.assetModuleFilename;

		const sourceFilename = AssetGenerator.getSourceFileName(
			module,
			runtimeTemplate
		);
		let { path: filename, info: assetInfo } =
			runtimeTemplate.compilation.getAssetPathWithInfo(assetModuleFilename, {
				module,
				runtime,
				filename: sourceFilename,
				chunkGraph,
				contentHash,
				contentHashFull: fullContentHash
			});

		const originalFilename = filename;

		if (generatorOptions.outputPath) {
			const { path: outputPath, info } =
				runtimeTemplate.compilation.getAssetPathWithInfo(
					generatorOptions.outputPath,
					{
						module,
						runtime,
						filename: sourceFilename,
						chunkGraph,
						contentHash,
						contentHashFull: fullContentHash
					}
				);
			filename = path.posix.join(outputPath, filename);
			assetInfo = mergeAssetInfo(assetInfo, info);
		}

		return { originalFilename, filename, assetInfo };
	}

	/**
	 * Gets asset path with info.
	 * @param {NormalModule} module module for which the code should be generated
	 * @param {Pick<AssetResourceGeneratorOptions, "publicPath">} generatorOptions generator options
	 * @param {GenerateContext} generateContext context for generate
	 * @param {string} filename the filename
	 * @param {AssetInfo} assetInfo the asset info
	 * @param {string} contentHash the content hash
	 * @param {string=} fullContentHash untruncated content hash, so `[contenthash:<digest>]` re-encodes from full entropy
	 * @returns {{ assetPath: string, assetInfo: AssetInfo }} asset path and info
	 */
	static getAssetPathWithInfo(
		module,
		generatorOptions,
		{ runtime, runtimeTemplate, type, chunkGraph, runtimeRequirements },
		filename,
		assetInfo,
		contentHash,
		fullContentHash
	) {
		const sourceFilename = AssetGenerator.getSourceFileName(
			module,
			runtimeTemplate
		);

		/** @type {undefined | string} */
		let assetPath;

		if (generatorOptions.publicPath !== undefined && type === JAVASCRIPT_TYPE) {
			const { path, info } = runtimeTemplate.compilation.getAssetPathWithInfo(
				generatorOptions.publicPath,
				{
					module,
					runtime,
					filename: sourceFilename,
					chunkGraph,
					contentHash,
					contentHashFull: fullContentHash
				}
			);
			assetInfo = mergeAssetInfo(assetInfo, info);
			assetPath = JSON.stringify(path + filename);
		} else if (
			generatorOptions.publicPath !== undefined &&
			type === ASSET_URL_TYPE
		) {
			const { path, info } = runtimeTemplate.compilation.getAssetPathWithInfo(
				generatorOptions.publicPath,
				{
					module,
					runtime,
					filename: sourceFilename,
					chunkGraph,
					contentHash,
					contentHashFull: fullContentHash
				}
			);
			assetInfo = mergeAssetInfo(assetInfo, info);
			assetPath = path + filename;
		} else if (type === JAVASCRIPT_TYPE) {
			// add __webpack_require__.p
			runtimeRequirements.add(RuntimeGlobals.publicPath);
			assetPath = runtimeTemplate.concatenation(
				{ expr: RuntimeGlobals.publicPath },
				filename
			);
		} else if (type === ASSET_URL_TYPE) {
			const compilation = runtimeTemplate.compilation;
			const path =
				compilation.outputOptions.publicPath === "auto"
					? PUBLIC_PATH_AUTO
					: compilation.getAssetPath(compilation.outputOptions.publicPath, {
							hash: compilation.hash || `${PUBLIC_PATH_FULL_HASH}0__`,
							hashWithLength: (length) =>
								compilation.hash
									? compilation.hash.slice(0, length)
									: `${PUBLIC_PATH_FULL_HASH}${length}__`
						});

			assetPath = path + filename;
		}

		return {
			assetPath: /** @type {string} */ (assetPath),
			assetInfo: { sourceFilename, ...assetInfo }
		};
	}

	/**
	 * Returns the reason this module cannot be concatenated, when one exists.
	 * @param {NormalModule} module module for which the bailout reason should be determined
	 * @param {ConcatenationBailoutReasonContext} context context
	 * @returns {string | undefined} reason why this module can't be concatenated, undefined when it can be concatenated
	 */
	getConcatenationBailoutReason(module, context) {
		return undefined;
	}

	/**
	 * Returns mime type.
	 * @param {NormalModule} module module
	 * @returns {string} mime type
	 */
	getMimeType(module) {
		if (typeof this.dataUrlOptions === "function") {
			throw new Error(
				"This method must not be called when dataUrlOptions is a function"
			);
		}

		/** @type {string | undefined} */
		let mimeType =
			/** @type {AssetGeneratorDataUrlOptions} */
			(this.dataUrlOptions).mimetype;
		if (mimeType === undefined) {
			const ext = path.extname(
				/** @type {NameForCondition} */
				(module.nameForCondition())
			);
			if (
				module.resourceResolveData &&
				module.resourceResolveData.mimetype !== undefined
			) {
				mimeType =
					module.resourceResolveData.mimetype +
					module.resourceResolveData.parameters;
			} else if (ext) {
				mimeType = getMimeTypes().lookup(ext);

				if (typeof mimeType !== "string") {
					throw new Error(
						"DataUrl can't be generated automatically, " +
							`because there is no mimetype for "${ext}" in mimetype database. ` +
							'Either pass a mimetype via "generator.mimetype" or ' +
							'use type: "asset/resource" to create a resource file instead of a DataUrl'
					);
				}
			}
		}

		if (typeof mimeType !== "string") {
			throw new Error(
				"DataUrl can't be generated automatically. " +
					'Either pass a mimetype via "generator.mimetype" or ' +
					'use type: "asset/resource" to create a resource file instead of a DataUrl'
			);
		}

		return /** @type {string} */ (mimeType);
	}

	/**
	 * Generates data uri.
	 * @param {NormalModule} module module for which the code should be generated
	 * @returns {string} DataURI
	 */
	generateDataUri(module) {
		const source = /** @type {Source} */ (module.originalSource());

		/** @type {string} */
		let encodedSource;

		if (typeof this.dataUrlOptions === "function") {
			encodedSource = this.dataUrlOptions.call(null, source.source(), {
				filename: /** @type {string} */ (module.getResource()),
				module
			});
		} else {
			let encoding =
				/** @type {AssetGeneratorDataUrlOptions} */
				(this.dataUrlOptions).encoding;
			if (
				encoding === undefined &&
				module.resourceResolveData &&
				module.resourceResolveData.encoding !== undefined
			) {
				encoding = module.resourceResolveData.encoding;
			}
			if (encoding === undefined) {
				encoding = DEFAULT_ENCODING;
			}
			const mimeType = this.getMimeType(module);

			/** @type {string} */
			let encodedContent;

			if (
				module.resourceResolveData &&
				module.resourceResolveData.encoding === encoding &&
				decodeDataUriContent(
					module.resourceResolveData.encoding,
					/** @type {string} */ (module.resourceResolveData.encodedContent)
				).equals(source.buffer())
			) {
				encodedContent =
					/** @type {string} */
					(module.resourceResolveData.encodedContent);
			} else {
				encodedContent = encodeDataUri(
					/** @type {"base64" | false} */ (encoding),
					source
				);
			}

			encodedSource = `data:${mimeType}${
				encoding ? `;${encoding}` : ""
			},${encodedContent}`;
		}

		return encodedSource;
	}

	/**
	 * Generates generated code for this runtime module.
	 * @param {NormalModule} module module for which the code should be generated
	 * @param {GenerateContext} generateContext context for generate
	 * @returns {Source | null} generated code
	 */
	generate(module, generateContext) {
		const {
			type,
			getData,
			runtimeTemplate,
			runtimeRequirements,
			concatenationScope
		} = generateContext;

		/** @type {string} */
		let content;

		const needContent = type === JAVASCRIPT_TYPE || type === ASSET_URL_TYPE;
		const data = getData ? getData() : undefined;

		if (
			/** @type {AssetModuleBuildInfo} */
			(module.buildInfo).dataUrl &&
			needContent
		) {
			const encodedSource = this.generateDataUri(module);
			content =
				type === JAVASCRIPT_TYPE
					? JSON.stringify(encodedSource)
					: encodedSource;

			if (data) {
				data.set("url", { ...data.get("url"), [type]: content });
			}
		} else {
			const [fullContentHash, contentHash] = AssetGenerator.getFullContentHash(
				module,
				runtimeTemplate
			);

			if (data) {
				data.set("fullContentHash", fullContentHash);
				data.set("contentHash", contentHash);
			}

			/** @type {AssetModuleBuildInfo} */
			(module.buildInfo).fullContentHash = fullContentHash;

			const { originalFilename, filename, assetInfo } =
				AssetGenerator.getFilenameWithInfo(
					module,
					{ filename: this.filename, outputPath: this.outputPath },
					generateContext,
					contentHash,
					fullContentHash
				);

			if (data) {
				data.set("filename", filename);
			}

			let { assetPath, assetInfo: newAssetInfo } =
				AssetGenerator.getAssetPathWithInfo(
					module,
					{ publicPath: this.publicPath },
					generateContext,
					originalFilename,
					assetInfo,
					contentHash,
					fullContentHash
				);

			if (data && (type === JAVASCRIPT_TYPE || type === ASSET_URL_TYPE)) {
				data.set("url", { ...data.get("url"), [type]: assetPath });
			}

			if (data) {
				const oldAssetInfo = data.get("assetInfo");

				if (oldAssetInfo) {
					newAssetInfo = mergeAssetInfo(oldAssetInfo, newAssetInfo);
				}
			}

			if (data) {
				data.set("assetInfo", newAssetInfo);
			}

			// Due to code generation caching module.buildInfo.XXX can't used to store such information
			// It need to be stored in the code generation results instead, where it's cached too
			// TODO webpack 6 For back-compat reasons we also store in on module.buildInfo
			/** @type {AssetModuleBuildInfo} */
			(module.buildInfo).filename = filename;

			/** @type {AssetModuleBuildInfo} */
			(module.buildInfo).assetInfo = newAssetInfo;

			content = assetPath;
		}

		if (type === JAVASCRIPT_TYPE) {
			if (concatenationScope) {
				concatenationScope.registerNamespaceExport(
					ConcatenationScope.NAMESPACE_OBJECT_EXPORT
				);

				return new RawSource(
					`${runtimeTemplate.renderConst()} ${
						ConcatenationScope.NAMESPACE_OBJECT_EXPORT
					} = ${content};`
				);
			}

			runtimeRequirements.add(RuntimeGlobals.module);

			return new RawSource(`${module.moduleArgument}.exports = ${content};`);
		} else if (type === ASSET_URL_TYPE) {
			return null;
		}

		return /** @type {Source} */ (module.originalSource());
	}

	/**
	 * Generates fallback output for the provided error condition.
	 * @param {Error} error the error
	 * @param {NormalModule} module module for which the code should be generated
	 * @param {GenerateContext} generateContext context for generate
	 * @returns {Source | null} generated code
	 */
	generateError(error, module, generateContext) {
		switch (generateContext.type) {
			case "asset": {
				return new RawSource(error.message);
			}
			case JAVASCRIPT_TYPE: {
				return new RawSource(
					`throw new Error(${JSON.stringify(error.message)});`
				);
			}
			default:
				return null;
		}
	}

	/**
	 * Returns whether the effective publicPath yields a chunk-independent absolute
	 * url (scheme-relative, protocol-absolute, or root-absolute) with no hash tokens.
	 * Only then is a `new URL` literal correct for every chunk the asset is shared by,
	 * so the `module.exports` wrapper can be dropped in favor of the `asset-url` type.
	 * @returns {boolean} true when the publicPath is a token-free absolute string
	 */
	_hasAbsolutePublicPath() {
		const publicPath =
			this.publicPath !== undefined
				? this.publicPath
				: this._compilation && this._compilation.outputOptions.publicPath;
		return (
			typeof publicPath === "string" &&
			!publicPath.includes("[") &&
			(publicPath.startsWith("/") ||
				/^[a-z][a-z\d+\-.]*:\/\//i.test(publicPath))
		);
	}

	/**
	 * Returns the source types available for this module.
	 * @param {NormalModule} module fresh module
	 * @returns {SourceTypes} available types (do not mutate)
	 */
	getTypes(module) {
		const connections = this._moduleGraph.getIncomingConnections(module);

		// Only ESM output can drop a bare `new URL()` to an analyzable asset-url; without
		// it every JS consumer needs the wrapper, so skip the per-connection dependency
		// probe entirely and keep the pre-existing cheap path.
		const isModule = Boolean(
			this._compilation && this._compilation.outputOptions.module
		);

		// Collapse the incoming origin types into flags instead of a Set of prefixes:
		// on assets shared by many modules this loop runs millions of times, so avoid
		// the per-connection `split("/")` allocation and stop early when the result is fixed.
		let hasOrigin = false;
		// JS origin that needs the `module.exports = …` wrapper (not a `new URL` ref).
		let hasOtherJs = false;
		// JS origin via `new URL(…, import.meta.url)` — droppable to `asset-url` in ESM.
		let hasUrlJs = false;
		// A manifest embeds a bare URL string (like css/html), so its icons must
		// resolve to `ASSET_URL_TYPE` rather than the JS runtime form.
		let hasUrl = false;
		for (const connection of connections) {
			const originModule = connection.originModule;
			if (!originModule) {
				continue;
			}
			hasOrigin = true;
			const originType = originModule.type;
			if (originType === ASSET_MODULE_TYPE_WEBMANIFEST) {
				hasUrl = true;
			} else if (typePrefixEquals(originType, JAVASCRIPT_TYPE)) {
				// Only a bare `new URL()` becomes the analyzable literal; relative and
				// prefetch/preload refs keep the runtime form and still need the wrapper.
				const dependency = isModule && connection.dependency;
				if (
					dependency &&
					dependency.type === "new URL()" &&
					!(/** @type {URLDependency} */ (dependency).relative) &&
					!(/** @type {URLDependency} */ (dependency).prefetch) &&
					!(/** @type {URLDependency} */ (dependency).preload)
				) {
					hasUrlJs = true;
				} else {
					hasOtherJs = true;
				}
			} else if (
				typePrefixEquals(originType, CSS_TYPE) ||
				typePrefixEquals(originType, HTML_TYPE)
			) {
				hasUrl = true;
			}
			// Once a non-URL JS consumer and a url consumer coexist the result is fixed.
			if (hasOtherJs && hasUrl) break;
		}

		const jsAsAssetUrl =
			isModule && hasUrlJs && !hasOtherJs && this._hasAbsolutePublicPath();
		// JS wrapper is needed for non-URL JS consumers, or URL consumers not dropped to asset-url.
		const wantJs = hasOtherJs || (hasUrlJs && !jsAsAssetUrl);
		const wantUrl = hasUrl || jsAsAssetUrl;

		if (
			(module.buildInfo &&
				/** @type {AssetModuleBuildInfo} */ (module.buildInfo).dataUrl) ||
			this.emit === false
		) {
			if (hasOrigin) {
				if (wantJs && wantUrl) {
					return JAVASCRIPT_AND_ASSET_URL_TYPES;
				} else if (wantUrl) {
					return ASSET_URL_TYPES;
				}
				return JAVASCRIPT_TYPES;
			}

			return NO_TYPES;
		}

		if (hasOrigin) {
			if (wantJs && wantUrl) {
				return ASSET_AND_JAVASCRIPT_AND_ASSET_URL_TYPES;
			} else if (wantUrl) {
				return ASSET_AND_ASSET_URL_TYPES;
			}
			return ASSET_AND_JAVASCRIPT_TYPES;
		}

		return ASSET_TYPES;
	}

	/**
	 * @returns {boolean} whether getTypes() depends on the module's incoming connections
	 */
	getTypesDependOnIncomingConnections() {
		return true;
	}

	/**
	 * Returns the estimated size for the requested source type.
	 * @param {NormalModule} module the module
	 * @param {SourceType=} type source type
	 * @returns {number} estimate size of the module
	 */
	getSize(module, type) {
		switch (type) {
			case ASSET_MODULE_TYPE: {
				const originalSource = module.originalSource();

				if (!originalSource) {
					return 0;
				}

				return originalSource.size();
			}
			default:
				if (
					module.buildInfo &&
					/** @type {AssetModuleBuildInfo} */ (module.buildInfo).dataUrl
				) {
					const originalSource = module.originalSource();

					if (!originalSource) {
						return 0;
					}

					// roughly for data url
					// Example: m.exports="data:image/png;base64,ag82/f+2=="
					// 4/3 = base64 encoding
					// 34 = ~ data url header + footer + rounding
					return originalSource.size() * 1.34 + 36;
				}
				// it's only estimated so this number is probably fine
				// Example: m.exports=r.p+"0123456789012345678901.ext"
				return 42;
		}
	}

	/**
	 * Updates the hash with the data contributed by this instance.
	 * @param {Hash} hash hash that will be modified
	 * @param {UpdateHashContext} updateHashContext context for updating hash
	 */
	updateHash(hash, updateHashContext) {
		const { module } = updateHashContext;

		if (
			/** @type {AssetModuleBuildInfo} */
			(module.buildInfo).dataUrl
		) {
			hash.update("data-url");
			// this.dataUrlOptions as function should be pure and only depend on input source and filename
			// therefore it doesn't need to be hashed
			if (typeof this.dataUrlOptions === "function") {
				const ident = /** @type {{ ident?: string }} */ (this.dataUrlOptions)
					.ident;
				if (ident) hash.update(ident);
			} else {
				const dataUrlOptions =
					/** @type {AssetGeneratorDataUrlOptions} */
					(this.dataUrlOptions);
				if (
					dataUrlOptions.encoding &&
					dataUrlOptions.encoding !== DEFAULT_ENCODING
				) {
					hash.update(dataUrlOptions.encoding);
				}
				if (dataUrlOptions.mimetype) hash.update(dataUrlOptions.mimetype);
				// computed mimetype depends only on module filename which is already part of the hash
			}
		} else {
			hash.update("resource");

			const { module, chunkGraph, runtime } = updateHashContext;
			const runtimeTemplate =
				/** @type {NonNullable<UpdateHashContext["runtimeTemplate"]>} */
				(updateHashContext.runtimeTemplate);

			const pathData = {
				module,
				runtime,
				filename: AssetGenerator.getSourceFileName(module, runtimeTemplate),
				chunkGraph,
				contentHash: runtimeTemplate.contentHashReplacement
			};

			if (typeof this.publicPath === "function") {
				hash.update("path");
				const assetInfo = {};
				hash.update(this.publicPath(pathData, assetInfo));
				hash.update(JSON.stringify(assetInfo));
			} else if (this.publicPath) {
				hash.update("path");
				hash.update(this.publicPath);
			} else {
				hash.update("no-path");
			}

			const assetModuleFilename =
				this.filename || runtimeTemplate.outputOptions.assetModuleFilename;
			const { path: filename, info } =
				runtimeTemplate.compilation.getAssetPathWithInfo(
					assetModuleFilename,
					pathData
				);
			hash.update(filename);
			hash.update(JSON.stringify(info));
		}
	}
}

module.exports = AssetGenerator;