问题：开启 sentry 配置，导致构建内存泄漏

默认构建配置 使用1个Worker，内存限制为2048MB

处理方式：

// Modifying node memory limits
export NODE_OPTIONS="--max-old-space-size=8192"

// 或者修改 SourceMap 生成方式（最低成本）
// https://v3.umijs.org/zh-CN/guide/boost-compile-speed#调整-sourcemap-生成方式

const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');

module.exports = {
  configureWebpack: config => {
    // get a reference to the existing ForkTsCheckerWebpackPlugin
    const existingForkTsChecker = config.plugins.filter(p => p instanceof ForkTsCheckerWebpackPlugin)[0];

    // remove the existing ForkTsCheckerWebpackPlugin
    // so that we can replace it with our modified version
    config.plugins = config.plugins.filter(p => !(p instanceof ForkTsCheckerWebpackPlugin));

    // copy the options from the original ForkTsCheckerWebpackPlugin
    // instance and add the memoryLimit property
    const forkTsCheckerOptions = existingForkTsChecker.options;
    // modification the workers
    forkTsCheckerOptions.workers = 2;
    // modification the memoryLimit
    forkTsCheckerOptions.memoryLimit = 12288;

    config.plugins.push(new ForkTsCheckerWebpackPlugin(forkTsCheckerOptions));
  }
};

修改后居然提升了构建速度 Before