35 lines
1.1 KiB
JavaScript
35 lines
1.1 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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class UseStrictPlugin {
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apply(compiler) {
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compiler.plugin("compilation", (compilation, params) => {
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params.normalModuleFactory.plugin("parser", (parser) => {
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const parserInstance = parser;
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parser.plugin("program", (ast) => {
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const firstNode = ast.body[0];
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if(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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// 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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parserInstance.state.current.addDependency(dep);
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parserInstance.state.module.strict = true;
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}
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});
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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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