/*
|
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;
|
