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node_modules/webpack/lib/dependencies/ImportMetaPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Ivan Kopeykin @vankop
+*/
+
+"use strict";
+
+const { pathToFileURL } = require("url");
+const ModuleDependencyWarning = require("../ModuleDependencyWarning");
+const Template = require("../Template");
+const BasicEvaluatedExpression = require("../javascript/BasicEvaluatedExpression");
+const {
+	evaluateToIdentifier,
+	toConstantDependency,
+	evaluateToString,
+	evaluateToNumber
+} = require("../javascript/JavascriptParserHelpers");
+const memoize = require("../util/memoize");
+const propertyAccess = require("../util/propertyAccess");
+const ConstDependency = require("./ConstDependency");
+
+/** @typedef {import("estree").MemberExpression} MemberExpression */
+/** @typedef {import("../../declarations/WebpackOptions").JavascriptParserOptions} JavascriptParserOptions */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../NormalModule")} NormalModule */
+/** @typedef {import("../javascript/JavascriptParser")} Parser */
+
+const getCriticalDependencyWarning = memoize(() =>
+	require("./CriticalDependencyWarning")
+);
+
+class ImportMetaPlugin {
+	/**
+	 * @param {Compiler} compiler compiler
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			"ImportMetaPlugin",
+			(compilation, { normalModuleFactory }) => {
+				/**
+				 * @param {NormalModule} module module
+				 * @returns {string} file url
+				 */
+				const getUrl = module => {
+					return pathToFileURL(module.resource).toString();
+				};
+				/**
+				 * @param {Parser} parser parser parser
+				 * @param {JavascriptParserOptions} parserOptions parserOptions
+				 * @returns {void}
+				 */
+				const parserHandler = (parser, { importMeta }) => {
+					if (importMeta === false) {
+						const { importMetaName } = compilation.outputOptions;
+						if (importMetaName === "import.meta") return;
+
+						parser.hooks.expression
+							.for("import.meta")
+							.tap("ImportMetaPlugin", metaProperty => {
+								const dep = new ConstDependency(
+									importMetaName,
+									metaProperty.range
+								);
+								dep.loc = metaProperty.loc;
+								parser.state.module.addPresentationalDependency(dep);
+								return true;
+							});
+						return;
+					}
+
+					/// import.meta direct ///
+					parser.hooks.typeof
+						.for("import.meta")
+						.tap(
+							"ImportMetaPlugin",
+							toConstantDependency(parser, JSON.stringify("object"))
+						);
+					parser.hooks.expression
+						.for("import.meta")
+						.tap("ImportMetaPlugin", metaProperty => {
+							const CriticalDependencyWarning = getCriticalDependencyWarning();
+							parser.state.module.addWarning(
+								new ModuleDependencyWarning(
+									parser.state.module,
+									new CriticalDependencyWarning(
+										"Accessing import.meta directly is unsupported (only property access is supported)"
+									),
+									metaProperty.loc
+								)
+							);
+							const dep = new ConstDependency(
+								`${parser.isAsiPosition(metaProperty.range[0]) ? ";" : ""}({})`,
+								metaProperty.range
+							);
+							dep.loc = metaProperty.loc;
+							parser.state.module.addPresentationalDependency(dep);
+							return true;
+						});
+					parser.hooks.evaluateTypeof
+						.for("import.meta")
+						.tap("ImportMetaPlugin", evaluateToString("object"));
+					parser.hooks.evaluateIdentifier.for("import.meta").tap(
+						"ImportMetaPlugin",
+						evaluateToIdentifier("import.meta", "import.meta", () => [], true)
+					);
+
+					/// import.meta.url ///
+					parser.hooks.typeof
+						.for("import.meta.url")
+						.tap(
+							"ImportMetaPlugin",
+							toConstantDependency(parser, JSON.stringify("string"))
+						);
+					parser.hooks.expression
+						.for("import.meta.url")
+						.tap("ImportMetaPlugin", expr => {
+							const dep = new ConstDependency(
+								JSON.stringify(getUrl(parser.state.module)),
+								expr.range
+							);
+							dep.loc = expr.loc;
+							parser.state.module.addPresentationalDependency(dep);
+							return true;
+						});
+					parser.hooks.evaluateTypeof
+						.for("import.meta.url")
+						.tap("ImportMetaPlugin", evaluateToString("string"));
+					parser.hooks.evaluateIdentifier
+						.for("import.meta.url")
+						.tap("ImportMetaPlugin", expr => {
+							return new BasicEvaluatedExpression()
+								.setString(getUrl(parser.state.module))
+								.setRange(expr.range);
+						});
+
+					/// import.meta.webpack ///
+					const webpackVersion = parseInt(
+						require("../../package.json").version,
+						10
+					);
+					parser.hooks.typeof
+						.for("import.meta.webpack")
+						.tap(
+							"ImportMetaPlugin",
+							toConstantDependency(parser, JSON.stringify("number"))
+						);
+					parser.hooks.expression
+						.for("import.meta.webpack")
+						.tap(
+							"ImportMetaPlugin",
+							toConstantDependency(parser, JSON.stringify(webpackVersion))
+						);
+					parser.hooks.evaluateTypeof
+						.for("import.meta.webpack")
+						.tap("ImportMetaPlugin", evaluateToString("number"));
+					parser.hooks.evaluateIdentifier
+						.for("import.meta.webpack")
+						.tap("ImportMetaPlugin", evaluateToNumber(webpackVersion));
+
+					/// Unknown properties ///
+					parser.hooks.unhandledExpressionMemberChain
+						.for("import.meta")
+						.tap("ImportMetaPlugin", (expr, members) => {
+							const dep = new ConstDependency(
+								`${Template.toNormalComment(
+									"unsupported import.meta." + members.join(".")
+								)} undefined${propertyAccess(members, 1)}`,
+								expr.range
+							);
+							dep.loc = expr.loc;
+							parser.state.module.addPresentationalDependency(dep);
+							return true;
+						});
+					parser.hooks.evaluate
+						.for("MemberExpression")
+						.tap("ImportMetaPlugin", expression => {
+							const expr = /** @type {MemberExpression} */ (expression);
+							if (
+								expr.object.type === "MetaProperty" &&
+								expr.object.meta.name === "import" &&
+								expr.object.property.name === "meta" &&
+								expr.property.type ===
+									(expr.computed ? "Literal" : "Identifier")
+							) {
+								return new BasicEvaluatedExpression()
+									.setUndefined()
+									.setRange(expr.range);
+							}
+						});
+				};
+
+				normalModuleFactory.hooks.parser
+					.for("javascript/auto")
+					.tap("ImportMetaPlugin", parserHandler);
+				normalModuleFactory.hooks.parser
+					.for("javascript/esm")
+					.tap("ImportMetaPlugin", parserHandler);
+			}
+		);
+	}
+}
+
+module.exports = ImportMetaPlugin;