chushihua

node_modules/webpack/lib/dependencies/SystemPlugin.js

@@ -0,0 +1,44 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+const ParserHelpers = require("../ParserHelpers");
+
+class SystemPlugin {
+	constructor(options) {
+		this.options = options;
+	}
+
+	apply(compiler) {
+		compiler.plugin("compilation", (compilation, params) => {
+			params.normalModuleFactory.plugin("parser", (parser, parserOptions) => {
+
+				if(typeof parserOptions.system !== "undefined" && !parserOptions.system)
+					return;
+
+				function setNotSupported(name) {
+					parser.plugin("evaluate typeof " + name, ParserHelpers.evaluateToString("undefined"));
+					parser.plugin("expression " + name,
+						ParserHelpers.expressionIsUnsupported(name + " is not supported by webpack.")
+					);
+				}
+
+				parser.plugin("typeof System.import", ParserHelpers.toConstantDependency(JSON.stringify("function")));
+				parser.plugin("evaluate typeof System.import", ParserHelpers.evaluateToString("function"));
+				parser.plugin("typeof System", ParserHelpers.toConstantDependency(JSON.stringify("object")));
+				parser.plugin("evaluate typeof System", ParserHelpers.evaluateToString("object"));
+
+				setNotSupported("System.set");
+				setNotSupported("System.get");
+				setNotSupported("System.register");
+				parser.plugin("expression System", function() {
+					const systemPolyfillRequire = ParserHelpers.requireFileAsExpression(
+						this.state.module.context, require.resolve("../../buildin/system.js"));
+					return ParserHelpers.addParsedVariableToModule(this, "System", systemPolyfillRequire);
+				});
+			});
+		});
+	}
+}
+module.exports = SystemPlugin;