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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const {
JAVASCRIPT_MODULE_TYPE_AUTO,
JAVASCRIPT_MODULE_TYPE_DYNAMIC,
JAVASCRIPT_MODULE_TYPE_ESM
} = require("./ModuleTypeConstants");
const ConstDependency = require("./dependencies/ConstDependency");
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./Dependency").DependencyLocation} DependencyLocation */
/** @typedef {import("./Module").BuildInfo} BuildInfo */
/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
/** @typedef {import("./javascript/JavascriptParser").Range} Range */
const PLUGIN_NAME = "UseStrictPlugin";
class UseStrictPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
PLUGIN_NAME,
(compilation, { normalModuleFactory }) => {
/**
* @param {JavascriptParser} parser the parser
*/
const handler = parser => {
parser.hooks.program.tap(PLUGIN_NAME, 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(
"",
/** @type {Range} */ (firstNode.range)
);
dep.loc = /** @type {DependencyLocation} */ (firstNode.loc);
parser.state.module.addPresentationalDependency(dep);
/** @type {BuildInfo} */
(parser.state.module.buildInfo).strict = true;
}
});
};
normalModuleFactory.hooks.parser
.for(JAVASCRIPT_MODULE_TYPE_AUTO)
.tap(PLUGIN_NAME, handler);
normalModuleFactory.hooks.parser
.for(JAVASCRIPT_MODULE_TYPE_DYNAMIC)
.tap(PLUGIN_NAME, handler);
normalModuleFactory.hooks.parser
.for(JAVASCRIPT_MODULE_TYPE_ESM)
.tap(PLUGIN_NAME, handler);
}
);
}
}
module.exports = UseStrictPlugin;
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