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feat: chainWebpack config support async (umijs#4344)
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‎docs/config/README.md‎

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@@ -103,6 +103,17 @@ export default {
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}
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```
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支持异步，
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```js
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export default {
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async chainWebpack(memo) {
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await delay(100);
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memo.resolve.alias.set('foo', '/tmp/a/b/foo');
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}
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}
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```
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参数有，
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* memo，当前 webpack-chain对象

‎docs/config/README.zh-CN.md‎

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}
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```
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支持异步，
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```js
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export default {
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async chainWebpack(memo) {
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await delay(100);
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memo.resolve.alias.set('foo', '/tmp/a/b/foo');
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}
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}
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```
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参数有，
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* memo，当前 webpack-chain对象

‎packages/bundler-webpack/src/fixtures/chainWebpack-delay/config.ts‎

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import { delay } from '@umijs/utils';
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export default {
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async chainWebpack(webpackConfig: any) {
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await delay(200);
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webpackConfig.resolve.alias.set('react', './react.ts');
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return webpackConfig;
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},
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}

‎packages/bundler-webpack/src/fixtures/chainWebpack-delay/expect.ts‎

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import { IExpectOpts } from '../types';
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export default ({ indexJS }: IExpectOpts) => {
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expect(indexJS).toContain(`var a = 'react';`);
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}

‎packages/bundler-webpack/src/fixtures/chainWebpack-delay/index.ts‎

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import react from 'react';
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console.log(react);

‎packages/bundler-webpack/src/fixtures/chainWebpack-delay/react.ts‎

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const a = 'react';
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export default a;

‎packages/bundler-webpack/src/getConfig/getConfig.ts‎

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}
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// 用户配置的 chainWebpack 优先级最高
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if (config.chainWebpack) {
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config.chainWebpack(webpackConfig, {
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await config.chainWebpack(webpackConfig, {
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env,
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webpack: bundleImplementor,
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createCSSRule: createCSSRuleFn,

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