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angular8 编译报错 Error: Call retries were exceeded  at ChildProcessWorker.initialize，具体如下：
Angular CLI版本: 8.3.21
```js
[error] Error: Call retries were exceeded
    at ChildProcessWorker.initialize (/data/html/boboJavaBlog/toolsWeb/node_modules/jest-worker/build/workers/ChildProcessWorker.js:193:21)
    at ChildProcessWorker.onExit (/data/html/boboJavaBlog/toolsWeb/node_modules/jest-worker/build/workers/ChildProcessWorker.js:263:12)
    at ChildProcess.emit (events.js:189:13)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12)
```
解决办法

tsconfig.json中的target从es2015改为es5
```
{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "module": "esnext",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2018",
      "dom"
    ]
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true
  }
}

```