| /* |
| 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 */ |
| |
| class UseStrictPlugin { |
| /** |
| * @param {Compiler} compiler Webpack Compiler |
| * @returns {void} |
| */ |
| apply(compiler) { |
| compiler.hooks.compilation.tap( |
| "UseStrictPlugin", |
| (compilation, { normalModuleFactory }) => { |
| const handler = parser => { |
| parser.hooks.program.tap("UseStrictPlugin", ast => { |
| const firstNode = ast.body[0]; |
| if ( |
| firstNode && |
| firstNode.type === "ExpressionStatement" && |
| firstNode.expression.type === "Literal" && |
| firstNode.expression.value === "use strict" |
| ) { |
| // Remove "use strict" expression. It will be added later by the renderer again. |
| // This is necessary in order to not break the strict mode when webpack prepends code. |
| // @see https://github.com/webpack/webpack/issues/1970 |
| const dep = new ConstDependency("", firstNode.range); |
| dep.loc = firstNode.loc; |
| parser.state.current.addDependency(dep); |
| parser.state.module.buildInfo.strict = true; |
| } |
| }); |
| }; |
| |
| normalModuleFactory.hooks.parser |
| .for("javascript/auto") |
| .tap("UseStrictPlugin", handler); |
| normalModuleFactory.hooks.parser |
| .for("javascript/dynamic") |
| .tap("UseStrictPlugin", handler); |
| normalModuleFactory.hooks.parser |
| .for("javascript/esm") |
| .tap("UseStrictPlugin", handler); |
| } |
| ); |
| } |
| } |
| |
| module.exports = UseStrictPlugin; |