57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const ConstDependency = require("./dependencies/ConstDependency");
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/** @typedef {import("./Compiler")} Compiler */
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class UseStrictPlugin {
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/**
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* Apply the plugin
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.compilation.tap(
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"UseStrictPlugin",
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(compilation, { normalModuleFactory }) => {
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const handler = parser => {
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parser.hooks.program.tap("UseStrictPlugin", ast => {
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const firstNode = ast.body[0];
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if (
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firstNode &&
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firstNode.type === "ExpressionStatement" &&
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firstNode.expression.type === "Literal" &&
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firstNode.expression.value === "use strict"
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) {
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// Remove "use strict" expression. It will be added later by the renderer again.
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// This is necessary in order to not break the strict mode when webpack prepends code.
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// @see https://github.com/webpack/webpack/issues/1970
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const dep = new ConstDependency("", firstNode.range);
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dep.loc = firstNode.loc;
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parser.state.module.addPresentationalDependency(dep);
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parser.state.module.buildInfo.strict = true;
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}
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});
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};
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normalModuleFactory.hooks.parser
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.for("javascript/auto")
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.tap("UseStrictPlugin", handler);
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normalModuleFactory.hooks.parser
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.for("javascript/dynamic")
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.tap("UseStrictPlugin", handler);
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normalModuleFactory.hooks.parser
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.for("javascript/esm")
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.tap("UseStrictPlugin", handler);
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}
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);
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}
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}
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module.exports = UseStrictPlugin;
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