Method getAsyncWeakSource

lib/ContextModule.js:919–971

* @param {Dependency[]} dependencies dependencies * @param {ModuleId} id module id * @param {ImportPhaseType} phase import phase * @param {object} context context * @param {ChunkGraph} context.chunkGraph the chunk graph * @param {RuntimeTemplate} context.runtimeTemplate the chunk graph *

(dependencies, id, phase, { chunkGraph, runtimeTemplate })

	 * @returns {string} source code
	 */
	getAsyncWeakSource(dependencies, id, phase, { chunkGraph, runtimeTemplate }) {
		const map = this.getUserRequestMap(dependencies, chunkGraph);
		const fakeMap = this.getFakeMap(dependencies, chunkGraph);
		const asyncDepsMap =
			ImportPhaseUtils.isDefer(phase) &&
			this.getModuleDeferredAsyncDepsMap(dependencies, chunkGraph);
		const returnModuleObject = this.getReturnModuleObjectSource(
			fakeMap,
			true,
			asyncDepsMap ? "asyncDepsMap[id]" : undefined
		);
		const cst = runtimeTemplate.renderConst();

		return `${cst} map = ${JSON.stringify(map, null, "\t")};
${this.getFakeMapInitStatement(fakeMap, runtimeTemplate)}
${this.getModuleDeferredAsyncDepsMapInitStatement(asyncDepsMap, runtimeTemplate)}

function webpackAsyncContext(req) {
	return webpackAsyncContextResolve(req).then(${runtimeTemplate.basicFunction(
		"id",
		[
			`if(!${RuntimeGlobals.moduleFactories}[id]) {`,
			Template.indent([
				`${cst} e = new Error("Module '" + req + "' ('" + id + "') is not available (weak dependency)");`,
				"e.code = 'MODULE_NOT_FOUND';",
				"throw e;"
			]),
			"}",
			`return ${returnModuleObject};`
		]
	)});
}
function webpackAsyncContextResolve(req) {
	// Here Promise.resolve().then() is used instead of new Promise() to prevent
	// uncaught exception popping up in devtools
	return Promise.resolve().then(${runtimeTemplate.basicFunction("", [
		`if(!${RuntimeGlobals.hasOwnProperty}(map, req)) {`,
		Template.indent([
			`${cst} e = new Error("Cannot find module '" + req + "'");`,
			"e.code = 'MODULE_NOT_FOUND';",
			"throw e;"
		]),
		"}",
		"return map[req];"
	])});
}
webpackAsyncContext.keys = ${runtimeTemplate.returningFunction(
			"Object.keys(map)"
		)};
webpackAsyncContext.resolve = webpackAsyncContextResolve;
webpackAsyncContext.id = ${JSON.stringify(id)};
module.exports = webpackAsyncContext;`;
	}

	/**
	 * @param {Dependency[]} dependencies dependencies