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node_modules/webpack/lib/dependencies/SystemPlugin.js

@@ -3,7 +3,9 @@
 	Author Tobias Koppers @sokra
 */
 "use strict";
+
 const ParserHelpers = require("../ParserHelpers");
+const WebpackError = require("../WebpackError");
 
 class SystemPlugin {
 	constructor(options) {
@@ -11,34 +13,110 @@ class SystemPlugin {
 	}
 
 	apply(compiler) {
-		compiler.plugin("compilation", (compilation, params) => {
-			params.normalModuleFactory.plugin("parser", (parser, parserOptions) => {
+		compiler.hooks.compilation.tap(
+			"SystemPlugin",
+			(compilation, { normalModuleFactory }) => {
+				const handler = (parser, parserOptions) => {
+					if (parserOptions.system !== undefined && !parserOptions.system)
+						return;
 
-				if(typeof parserOptions.system !== "undefined" && !parserOptions.system)
-					return;
+					const shouldWarn = parserOptions.system === undefined;
 
-				function setNotSupported(name) {
-					parser.plugin("evaluate typeof " + name, ParserHelpers.evaluateToString("undefined"));
-					parser.plugin("expression " + name,
-						ParserHelpers.expressionIsUnsupported(name + " is not supported by webpack.")
-					);
-				}
+					const setNotSupported = name => {
+						parser.hooks.evaluateTypeof
+							.for(name)
+							.tap("SystemPlugin", ParserHelpers.evaluateToString("undefined"));
+						parser.hooks.expression
+							.for(name)
+							.tap(
+								"SystemPlugin",
+								ParserHelpers.expressionIsUnsupported(
+									parser,
+									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"));
+					parser.hooks.typeof
+						.for("System.import")
+						.tap(
+							"SystemPlugin",
+							ParserHelpers.toConstantDependency(
+								parser,
+								JSON.stringify("function")
+							)
+						);
+					parser.hooks.evaluateTypeof
+						.for("System.import")
+						.tap("SystemPlugin", ParserHelpers.evaluateToString("function"));
+					parser.hooks.typeof
+						.for("System")
+						.tap(
+							"SystemPlugin",
+							ParserHelpers.toConstantDependency(
+								parser,
+								JSON.stringify("object")
+							)
+						);
+					parser.hooks.evaluateTypeof
+						.for("System")
+						.tap("SystemPlugin", 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);
-				});
-			});
-		});
+					setNotSupported("System.set");
+					setNotSupported("System.get");
+					setNotSupported("System.register");
+
+					parser.hooks.expression.for("System").tap("SystemPlugin", () => {
+						const systemPolyfillRequire = ParserHelpers.requireFileAsExpression(
+							parser.state.module.context,
+							require.resolve("../../buildin/system")
+						);
+						return ParserHelpers.addParsedVariableToModule(
+							parser,
+							"System",
+							systemPolyfillRequire
+						);
+					});
+
+					parser.hooks.call.for("System.import").tap("SystemPlugin", expr => {
+						if (shouldWarn) {
+							parser.state.module.warnings.push(
+								new SystemImportDeprecationWarning(
+									parser.state.module,
+									expr.loc
+								)
+							);
+						}
+
+						return parser.hooks.importCall.call(expr);
+					});
+				};
+
+				normalModuleFactory.hooks.parser
+					.for("javascript/auto")
+					.tap("SystemPlugin", handler);
+				normalModuleFactory.hooks.parser
+					.for("javascript/dynamic")
+					.tap("SystemPlugin", handler);
+			}
+		);
 	}
 }
+
+class SystemImportDeprecationWarning extends WebpackError {
+	constructor(module, loc) {
+		super(
+			"System.import() is deprecated and will be removed soon. Use import() instead.\n" +
+				"For more info visit https://webpack.js.org/guides/code-splitting/"
+		);
+
+		this.name = "SystemImportDeprecationWarning";
+
+		this.module = module;
+		this.loc = loc;
+
+		Error.captureStackTrace(this, this.constructor);
+	}
+}
+
 module.exports = SystemPlugin;