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node_modules/webpack/lib/CompatibilityPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const ConstDependency = require("./dependencies/ConstDependency");
+
+/** @typedef {import("./Compiler")} Compiler */
+/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
+
+const nestedWebpackRequireTag = Symbol("nested __webpack_require__");
+
+class CompatibilityPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			"CompatibilityPlugin",
+			(compilation, { normalModuleFactory }) => {
+				compilation.dependencyTemplates.set(
+					ConstDependency,
+					new ConstDependency.Template()
+				);
+
+				normalModuleFactory.hooks.parser
+					.for("javascript/auto")
+					.tap("CompatibilityPlugin", (parser, parserOptions) => {
+						if (
+							parserOptions.browserify !== undefined &&
+							!parserOptions.browserify
+						)
+							return;
+
+						parser.hooks.call
+							.for("require")
+							.tap("CompatibilityPlugin", expr => {
+								// support for browserify style require delegator: "require(o, !0)"
+								if (expr.arguments.length !== 2) return;
+								const second = parser.evaluateExpression(expr.arguments[1]);
+								if (!second.isBoolean()) return;
+								if (second.asBool() !== true) return;
+								const dep = new ConstDependency("require", expr.callee.range);
+								dep.loc = expr.loc;
+								if (parser.state.current.dependencies.length > 0) {
+									const last =
+										parser.state.current.dependencies[
+											parser.state.current.dependencies.length - 1
+										];
+									if (
+										last.critical &&
+										last.options &&
+										last.options.request === "." &&
+										last.userRequest === "." &&
+										last.options.recursive
+									)
+										parser.state.current.dependencies.pop();
+								}
+								parser.state.module.addPresentationalDependency(dep);
+								return true;
+							});
+					});
+
+				/**
+				 * @param {JavascriptParser} parser the parser
+				 * @returns {void}
+				 */
+				const handler = parser => {
+					// Handle nested requires
+					parser.hooks.preStatement.tap("CompatibilityPlugin", statement => {
+						if (
+							statement.type === "FunctionDeclaration" &&
+							statement.id &&
+							statement.id.name === "__webpack_require__"
+						) {
+							const newName = `__nested_webpack_require_${statement.range[0]}__`;
+							parser.tagVariable(statement.id.name, nestedWebpackRequireTag, {
+								name: newName,
+								declaration: {
+									updated: false,
+									loc: statement.id.loc,
+									range: statement.id.range
+								}
+							});
+							return true;
+						}
+					});
+					parser.hooks.pattern
+						.for("__webpack_require__")
+						.tap("CompatibilityPlugin", pattern => {
+							const newName = `__nested_webpack_require_${pattern.range[0]}__`;
+							parser.tagVariable(pattern.name, nestedWebpackRequireTag, {
+								name: newName,
+								declaration: {
+									updated: false,
+									loc: pattern.loc,
+									range: pattern.range
+								}
+							});
+							return true;
+						});
+					parser.hooks.expression
+						.for(nestedWebpackRequireTag)
+						.tap("CompatibilityPlugin", expr => {
+							const { name, declaration } = parser.currentTagData;
+							if (!declaration.updated) {
+								const dep = new ConstDependency(name, declaration.range);
+								dep.loc = declaration.loc;
+								parser.state.module.addPresentationalDependency(dep);
+								declaration.updated = true;
+							}
+							const dep = new ConstDependency(name, expr.range);
+							dep.loc = expr.loc;
+							parser.state.module.addPresentationalDependency(dep);
+							return true;
+						});
+
+					// Handle hashbang
+					parser.hooks.program.tap(
+						"CompatibilityPlugin",
+						(program, comments) => {
+							if (comments.length === 0) return;
+							const c = comments[0];
+							if (c.type === "Line" && c.range[0] === 0) {
+								if (parser.state.source.slice(0, 2).toString() !== "#!") return;
+								// this is a hashbang comment
+								const dep = new ConstDependency("//", 0);
+								dep.loc = c.loc;
+								parser.state.module.addPresentationalDependency(dep);
+							}
+						}
+					);
+				};
+
+				normalModuleFactory.hooks.parser
+					.for("javascript/auto")
+					.tap("CompatibilityPlugin", handler);
+				normalModuleFactory.hooks.parser
+					.for("javascript/dynamic")
+					.tap("CompatibilityPlugin", handler);
+				normalModuleFactory.hooks.parser
+					.for("javascript/esm")
+					.tap("CompatibilityPlugin", handler);
+			}
+		);
+	}
+}
+module.exports = CompatibilityPlugin;