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import { copyFileSync, existsSync } from 'fs';import { join } from 'path';import { IApi } from 'umi';
export default (api: IApi) => {  api.onBuildComplete(({ err }) => {    //@ts-ignore    if (!err && !existsSync(join(api.paths.absOutputPath!, '404.html'))) {      // 如果没有 404 则复制一下 index      setTimeout(() => {        copyFileSync(          join(api.paths.absOutputPath!, 'index.html'),          join(api.paths.absOutputPath!, '404.html'),        );      }, 500);    }  });};