webpack/lib/dependencies/HarmonyExportExpressionDependency.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 NullDependency = require("./NullDependency");

class HarmonyExportExpressionDependency extends NullDependency {
	constructor(originModule, range, rangeStatement, prefix) {
		super();
		this.originModule = originModule;
		this.range = range;
		this.rangeStatement = rangeStatement;
		this.prefix = prefix;
	}

	get type() {
		return "harmony export expression";
	}

	getExports() {
		return {
			exports: ["default"],
			dependencies: undefined
		};
	}
}

HarmonyExportExpressionDependency.Template = class HarmonyExportDependencyTemplate {
	apply(dep, source) {
		const used = dep.originModule.isUsed("default");
		const content = this.getContent(dep.originModule, used);

		if (dep.range) {
			source.replace(
				dep.rangeStatement[0],
				dep.range[0] - 1,
				content + "(" + dep.prefix
			);
			source.replace(dep.range[1], dep.rangeStatement[1] - 1, ");");
			return;
		}

		source.replace(dep.rangeStatement[0], dep.rangeStatement[1] - 1, content);
	}

	getContent(module, used) {
		const exportsName = module.exportsArgument;
		if (used) {
			return `/* harmony default export */ ${exportsName}[${JSON.stringify(
				used
			)}] = `;
		}
		return "/* unused harmony default export */ var _unused_webpack_default_export = ";
	}
};

module.exports = HarmonyExportExpressionDependency;