webpack/lib/dependencies/DynamicExports.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 Tobias Koppers @sokra
*/

"use strict";

/** @typedef {import("../Module").BuildMeta} BuildMeta */
/** @typedef {import("../Parser").ParserState} ParserState */

/** @type {WeakMap<ParserState, boolean>} */
const parserStateExportsState = new WeakMap();

/**
 * @param {ParserState} parserState parser state
 * @returns {void}
 */
exports.bailout = parserState => {
	const value = parserStateExportsState.get(parserState);
	parserStateExportsState.set(parserState, false);
	if (value === true) {
		const buildMeta = /** @type {BuildMeta} */ (parserState.module.buildMeta);
		buildMeta.exportsType = undefined;
		buildMeta.defaultObject = false;
	}
};

/**
 * @param {ParserState} parserState parser state
 * @returns {void}
 */
exports.enable = parserState => {
	const value = parserStateExportsState.get(parserState);
	if (value === false) return;
	parserStateExportsState.set(parserState, true);
	if (value !== true) {
		const buildMeta = /** @type {BuildMeta} */ (parserState.module.buildMeta);
		buildMeta.exportsType = "default";
		buildMeta.defaultObject = "redirect";
	}
};

/**
 * @param {ParserState} parserState parser state
 * @returns {void}
 */
exports.setFlagged = parserState => {
	const value = parserStateExportsState.get(parserState);
	if (value !== true) return;
	const buildMeta = /** @type {BuildMeta} */ (parserState.module.buildMeta);
	if (buildMeta.exportsType === "dynamic") return;
	buildMeta.exportsType = "flagged";
};

/**
 * @param {ParserState} parserState parser state
 * @returns {void}
 */
exports.setDynamic = parserState => {
	const value = parserStateExportsState.get(parserState);
	if (value !== true) return;
	/** @type {BuildMeta} */
	(parserState.module.buildMeta).exportsType = "dynamic";
};

/**
 * @param {ParserState} parserState parser state
 * @returns {boolean} true, when enabled
 */
exports.isEnabled = parserState => {
	const value = parserStateExportsState.get(parserState);
	return value === true;
};