webpack/lib/asset/AssetParser.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 Yuta Hiroto @hiroppy
*/

"use strict";

const Parser = require("../Parser");

/** @typedef {import("../../declarations/WebpackOptions").AssetParserDataUrlOptions} AssetParserDataUrlOptions */
/** @typedef {import("../../declarations/WebpackOptions").AssetParserOptions} AssetParserOptions */
/** @typedef {import("../Module").BuildInfo} BuildInfo */
/** @typedef {import("../Module").BuildMeta} BuildMeta */
/** @typedef {import("../Parser").ParserState} ParserState */
/** @typedef {import("../Parser").PreparsedAst} PreparsedAst */

class AssetParser extends Parser {
	/**
	 * @param {AssetParserOptions["dataUrlCondition"] | boolean} dataUrlCondition condition for inlining as DataUrl
	 */
	constructor(dataUrlCondition) {
		super();
		this.dataUrlCondition = dataUrlCondition;
	}

	/**
	 * @param {string | Buffer | PreparsedAst} source the source to parse
	 * @param {ParserState} state the parser state
	 * @returns {ParserState} the parser state
	 */
	parse(source, state) {
		if (typeof source === "object" && !Buffer.isBuffer(source)) {
			throw new Error("AssetParser doesn't accept preparsed AST");
		}

		const buildInfo = /** @type {BuildInfo} */ (state.module.buildInfo);
		buildInfo.strict = true;
		const buildMeta = /** @type {BuildMeta} */ (state.module.buildMeta);
		buildMeta.exportsType = "default";
		buildMeta.defaultObject = false;

		if (typeof this.dataUrlCondition === "function") {
			buildInfo.dataUrl = this.dataUrlCondition(source, {
				filename: state.module.matchResource || state.module.resource,
				module: state.module
			});
		} else if (typeof this.dataUrlCondition === "boolean") {
			buildInfo.dataUrl = this.dataUrlCondition;
		} else if (
			this.dataUrlCondition &&
			typeof this.dataUrlCondition === "object"
		) {
			buildInfo.dataUrl =
				Buffer.byteLength(source) <=
				/** @type {NonNullable<AssetParserDataUrlOptions["maxSize"]>} */
				(this.dataUrlCondition.maxSize);
		} else {
			throw new Error("Unexpected dataUrlCondition type");
		}

		return state;
	}
}

module.exports = AssetParser;