fineui是帆软报表和BI产品线所使用的前端框架。
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/*
* fui-worker worker-loader
*/
const webpack = require('webpack');
const loaderUtils = require('loader-utils');
const SingleEntryPlugin = require('webpack/lib/SingleEntryPlugin');
const { WorkerLoaderName, FileNamePrefix } = require('./constants');
const { resolve } = require('path');
// 正常 loader 处理逻辑
function loader() {
const callback = this.async();
this.cacheable(false);
// 过滤掉当前的 worker-loader, 保留 worker 侧构建需要的其他 loader(babel-loader/ts-loader 等)
const otherLoaders = this.loaders.filter((loader, index) => {
if (index === this.loaderIndex) {
return false;
}
return true;
});
/**
* 拼接构建需要的 loader 字符串, 用于指定 childCompiler 的构建 loader
* 比如: /path/to/babel-loader/lib/index.js!/path/to/ts-loader/index.js!
*/
const loaderPath = otherLoaders.reduce((pre, loader) => `${pre}${loader.path}!`, '');
/**
* worker 独立构建的 entry
* 构建 loader + worker 源码入口文件路径
*
* https://webpack.js.org/concepts/loaders/#inline
* `!!` 实现在 childCompiler 中忽略其他所有 loader, 只保留主构建的 loader
* 不然 worker 入口在 childCompiler 中会继续由 worker-loader 处理, 造成死循环
*/
const workerEntry = `!!${loaderPath}${this.resourcePath}`;
// 把资源纳入构建流程的依赖, 实现 dev 模式下的 watch
this.addDependency(workerEntry);
// 生成的 service 独立 bundle 名称
const entryFileName = `${FileNamePrefix}index`;
// 获取传递给 loader 的 options
const options = Object.assign(loaderUtils.getOptions(this) || {}, this.options);
// 创建 childCompiler, 用于实现 worker 构建为独立 js 资源
const childCompiler = this._compilation.createChildCompiler(WorkerLoaderName, {
globalObject: 'this',
});
childCompiler.context = this._compiler.context;
// 指定独立构建的 entry 和生成 js 资源名称
new SingleEntryPlugin(this.context, workerEntry, entryFileName).apply(childCompiler);
// 设置 worker 侧的环境变量
new webpack.DefinePlugin({
__WORKER__: true,
}).apply(childCompiler);
// 添加 window 全局对象, 映射为 worker 线程全局对象 self
// 如果在 worker 源码中添加, 可能没有前置到所有引用模块前
new webpack.BannerPlugin({
banner: 'self.window = self;',
raw: true,
entryOnly: true,
}).apply(childCompiler);
// 去除源码中的less css引用
const regExp = /\.(css|less)$/;
new webpack.NormalModuleReplacementPlugin(
regExp,
result => {
if (regExp.test(result.request)) {
result.request = resolve(__dirname, './empty.js');
}
if (regExp.test(result.resource)) {
result.resource = resolve(__dirname, './empty.js');
}
},
).apply(childCompiler);
const subCache = `subcache ${__dirname} ${workerEntry}`;
childCompiler.hooks.compilation.tap(WorkerLoaderName, compilation => {
if (compilation.cache) {
if (!compilation.cache[subCache]) compilation.cache[subCache] = {};
compilation.cache = compilation.cache[subCache];
}
});
childCompiler.runAsChild((error, entries, compilation) => {
if (!error && compilation.errors && compilation.errors.length) {
// eslint-disable-next-line no-param-reassign
error = compilation.errors[0];
}
// compatible with Array (v4) and Set (v5) prototypes
const entry = entries && entries[0] && entries[0].files.values().next().value;
if (!error && !entry) {
// eslint-disable-next-line no-param-reassign
error = Error(`${WorkerLoaderName}, no entry for ${workerEntry}`);
}
if (error) {
return callback(error);
}
// 支持blob url形式
return options.inline
? callback(
null,
// 插入代码的转译和压缩由主构建配置的 babel/ts loader 处理, 不需要 worker-worker 来处理
// 添加 @ts-nocheck 避免 ts-check 报错
// 修复export const 下 const不会被转译的问题
`// @ts-nocheck
const blob = new Blob([${JSON.stringify(compilation.assets[entry].source())}]);
const workerUrl = window.URL.createObjectURL(blob);
export default workerUrl;
`
)
: callback(
null,
`// @ts-nocheck
const servicePath = __webpack_public_path__ + ${JSON.stringify(entry)};
export default servicePath;
`
)
});
return;
}
module.exports = loader;