Compiler.prototype.run = (callback) => {const startTime = Date.now();const onCompiled = (err, compilation) => { /**/ };this.applyPluginsAsync("before-run", this, err => {if (err) return callback(err);this.applyPluginsAsync("run", this, err => {if (err) return callback(err);this.readRecords(err => {if (err) return callback(err);this.compile(onCompiled);});});});
}

// NodeEnvironmentPlugin
compiler.plugin("before-run", (compiler, callback) => {if (compiler.inputFileSystem === inputFileSystem)inputFileSystem.purge();callback();
});

// tapable
Tapable.prototype.applyPluginsAsync = (name, ...args, callback) => {var plugins = this._plugins[name];if (!plugins || plugins.length === 0) return callback();var i = 0;var _this = this;// args为[args,next函数]args.push(copyProperties(callback, function next(err) {// 事件流出错或者全部执行完后调用回调函数if (err) return callback(err);i++;if (i >= plugins.length) {return callback();}// 执行下一个事件
        plugins[i].apply(_this, args);}));// 执行第一个事件plugins[0].apply(this, args);
};

// before-run
// compiler => this
// callback => next
(compiler, callback) => {if (compiler.inputFileSystem === inputFileSystem)inputFileSystem.purge();callback();
}

// NodeEnvironmentPlugin
compiler.inputFileSystem = new CachedInputFileSystem(new NodeJsInputFileSystem(), 60000);// CachedInputFileSystem
CachedInputFileSystem.prototype.purge = function(what) {this._statStorage.purge(what);this._readdirStorage.purge(what);this._readFileStorage.purge(what);this._readlinkStorage.purge(what);this._readJsonStorage.purge(what);
};// CachedInputFileSystem => Storage
Storage.prototype.purge = function(what) {if (!what) {this.count = 0;clearInterval(this.interval);this.nextTick = null;this.data.clear();this.levels.forEach(function(level) {level.clear();});} else if (typeof what === "string") { /**/ } else { /**/ }
};

Compiler.plugin("run", (compiler, callback) => {// 这个属性我暂时也不知道是啥 反正直接callback了if (!compiler._lastCompilationFileDependencies) return callback();const fs = compiler.inputFileSystem;const fileTs = compiler.fileTimestamps = {};asyncLib.forEach(compiler._lastCompilationFileDependencies, (file, callback) => {// ...}, err => {// ...
    });
});

this.readRecords(err => {if (err) return callback(err);this.compile(onCompiled);
});

Compiler.prototype.readRecords = (callback) => {// 这个属性也没有if (!this.recordsInputPath) {this.records = {};return callback();}this.inputFileSystem.stat(this.recordsInputPath, err => {// ...
    });
}

Compiler.prototype.compile = (callback) => {const params = this.newCompilationParams();// 依次触发事件流this.applyPluginsAsync("before-compile", params, err => {if (err) return callback(err);this.applyPlugins("compile", params);const compilation = this.newCompilation(params);this.applyPluginsParallel("make", compilation, err => {if (err) return callback(err);compilation.finish();compilation.seal(err => {if (err) return callback(err);this.applyPluginsAsync("after-compile", compilation, err => {if (err) return callback(err);return callback(null, compilation);});});});});
}