init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Sergey Melyukov @smelukov
*/
 
"use strict";
 
const {
    JAVASCRIPT_MODULE_TYPE_AUTO,
    JAVASCRIPT_MODULE_TYPE_DYNAMIC,
    JAVASCRIPT_MODULE_TYPE_ESM
} = require("./ModuleTypeConstants");
const InnerGraph = require("./optimize/InnerGraph");
 
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
 
const PLUGIN_NAME = "JavascriptMetaInfoPlugin";
 
class JavascriptMetaInfoPlugin {
    /**
     * 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
                 * @returns {void}
                 */
                const handler = parser => {
                    parser.hooks.call.for("eval").tap(PLUGIN_NAME, () => {
                        parser.state.module.buildInfo.moduleConcatenationBailout = "eval()";
                        parser.state.module.buildInfo.usingEval = true;
                        const currentSymbol = InnerGraph.getTopLevelSymbol(parser.state);
                        if (currentSymbol) {
                            InnerGraph.addUsage(parser.state, null, currentSymbol);
                        } else {
                            InnerGraph.bailout(parser.state);
                        }
                    });
                    parser.hooks.finish.tap(PLUGIN_NAME, () => {
                        let topLevelDeclarations =
                            parser.state.module.buildInfo.topLevelDeclarations;
                        if (topLevelDeclarations === undefined) {
                            topLevelDeclarations =
                                parser.state.module.buildInfo.topLevelDeclarations = new Set();
                        }
                        for (const name of parser.scope.definitions.asSet()) {
                            const freeInfo = parser.getFreeInfoFromVariable(name);
                            if (freeInfo === undefined) {
                                topLevelDeclarations.add(name);
                            }
                        }
                    });
                };
 
                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 = JavascriptMetaInfoPlugin;