webpack/lib/FunctionModuleTemplatePlugin.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");
const Template = require("./Template");

class FunctionModuleTemplatePlugin {
	apply(moduleTemplate) {
		moduleTemplate.hooks.render.tap(
			"FunctionModuleTemplatePlugin",
			(moduleSource, module) => {
				const source = new ConcatSource();
				const args = [module.moduleArgument];
				// TODO remove HACK checking type for javascript
				if (module.type && module.type.startsWith("javascript")) {
					args.push(module.exportsArgument);
					if (module.hasDependencies(d => d.requireWebpackRequire !== false)) {
						args.push("__webpack_require__");
					}
				} else if (module.type && module.type.startsWith("json")) {
					// no additional arguments needed
				} else {
					args.push(module.exportsArgument, "__webpack_require__");
				}
				source.add("/***/ (function(" + args.join(", ") + ") {\n\n");
				if (module.buildInfo.strict) source.add('"use strict";\n');
				source.add(moduleSource);
				source.add("\n\n/***/ })");
				return source;
			}
		);

		moduleTemplate.hooks.package.tap(
			"FunctionModuleTemplatePlugin",
			(moduleSource, module) => {
				if (moduleTemplate.runtimeTemplate.outputOptions.pathinfo) {
					const source = new ConcatSource();
					const req = module.readableIdentifier(
						moduleTemplate.runtimeTemplate.requestShortener
					);
					const reqStr = req.replace(/\*\//g, "*_/");
					const reqStrStar = "*".repeat(reqStr.length);
					source.add("/*!****" + reqStrStar + "****!*\\\n");
					source.add("  !*** " + reqStr + " ***!\n");
					source.add("  \\****" + reqStrStar + "****/\n");
					if (
						Array.isArray(module.buildMeta.providedExports) &&
						module.buildMeta.providedExports.length === 0
					) {
						source.add(Template.toComment("no exports provided") + "\n");
					} else if (Array.isArray(module.buildMeta.providedExports)) {
						source.add(
							Template.toComment(
								"exports provided: " +
									module.buildMeta.providedExports.join(", ")
							) + "\n"
						);
					} else if (module.buildMeta.providedExports) {
						source.add(Template.toComment("no static exports found") + "\n");
					}
					if (
						Array.isArray(module.usedExports) &&
						module.usedExports.length === 0
					) {
						source.add(Template.toComment("no exports used") + "\n");
					} else if (Array.isArray(module.usedExports)) {
						source.add(
							Template.toComment(
								"exports used: " + module.usedExports.join(", ")
							) + "\n"
						);
					} else if (module.usedExports) {
						source.add(Template.toComment("all exports used") + "\n");
					}
					if (module.optimizationBailout) {
						for (const text of module.optimizationBailout) {
							let code;
							if (typeof text === "function") {
								code = text(moduleTemplate.runtimeTemplate.requestShortener);
							} else {
								code = text;
							}
							source.add(Template.toComment(`${code}`) + "\n");
						}
					}
					source.add(moduleSource);
					return source;
				}
				return moduleSource;
			}
		);

		moduleTemplate.hooks.hash.tap("FunctionModuleTemplatePlugin", hash => {
			hash.update("FunctionModuleTemplatePlugin");
			hash.update("2");
		});
	}
}
module.exports = FunctionModuleTemplatePlugin;