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56 lines
1.6 KiB
56 lines
1.6 KiB
/* |
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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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