webpack/lib/web/JsonpChunkTemplatePlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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 Tobias Koppers @sokra
*/
"use strict";

const { ConcatSource } = require("webpack-sources");

/** @typedef {import("../ChunkTemplate")} ChunkTemplate */

const getEntryInfo = chunk => {
	return [chunk.entryModule].filter(Boolean).map(m =>
		[m.id].concat(
			Array.from(chunk.groupsIterable)[0]
				.chunks.filter(c => c !== chunk)
				.map(c => c.id)
		)
	);
};

class JsonpChunkTemplatePlugin {
	/**
	 * @param {ChunkTemplate} chunkTemplate the chunk template
	 * @returns {void}
	 */
	apply(chunkTemplate) {
		chunkTemplate.hooks.render.tap(
			"JsonpChunkTemplatePlugin",
			(modules, chunk) => {
				const jsonpFunction = chunkTemplate.outputOptions.jsonpFunction;
				const globalObject = chunkTemplate.outputOptions.globalObject;
				const source = new ConcatSource();
				const prefetchChunks = chunk.getChildIdsByOrders().prefetch;
				source.add(
					`(${globalObject}[${JSON.stringify(
						jsonpFunction
					)}] = ${globalObject}[${JSON.stringify(
						jsonpFunction
					)}] || []).push([${JSON.stringify(chunk.ids)},`
				);
				source.add(modules);
				const entries = getEntryInfo(chunk);
				if (entries.length > 0) {
					source.add(`,${JSON.stringify(entries)}`);
				} else if (prefetchChunks && prefetchChunks.length) {
					source.add(`,0`);
				}

				if (prefetchChunks && prefetchChunks.length) {
					source.add(`,${JSON.stringify(prefetchChunks)}`);
				}
				source.add("])");
				return source;
			}
		);
		chunkTemplate.hooks.hash.tap("JsonpChunkTemplatePlugin", hash => {
			hash.update("JsonpChunkTemplatePlugin");
			hash.update("4");
			hash.update(`${chunkTemplate.outputOptions.jsonpFunction}`);
			hash.update(`${chunkTemplate.outputOptions.globalObject}`);
		});
		chunkTemplate.hooks.hashForChunk.tap(
			"JsonpChunkTemplatePlugin",
			(hash, chunk) => {
				hash.update(JSON.stringify(getEntryInfo(chunk)));
				hash.update(JSON.stringify(chunk.getChildIdsByOrders().prefetch) || "");
			}
		);
	}
}
module.exports = JsonpChunkTemplatePlugin;