init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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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("./javascript/JavascriptParser")} JavascriptParser */
 
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("", firstNode.range);
                            dep.loc = firstNode.loc;
                            parser.state.module.addPresentationalDependency(dep);
                            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;