Use Solution Style tsconfig.json Files

[xiaoxiangmoe]

🚀 Feature request

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Description

Current, we can use describe, it, test, expect in app. Because we use "types": ["jasmine","node"] in tsconfig.json. And this is for tsconfig.spec.json, not for tsconfig.app.json.

In order to get a better IDE experience, we can use “Solution Style” tsconfig.json Files in TypeScript 3.9

// tsconfig.json
{
  "files": [],
  "references": [
    { "path": "./tsconfig.app.json" },
    { "path": "./tsconfig.spec.json" },
  ]
}

{
  // tsconfig.app.json
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "module": "es2020",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2015",
    "lib": [
      "es2018",
      "dom"
    ],
    "types": []
  },
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ]
}

{
  //tsconfig.spec.json
  "extends": "./tsconfig.app.json",
  "compilerOptions": {
    "outDir": "./out-tsc/spec",
    "types": [
      "jasmine",
      "node"
    ]
  },
  "files": [
    "src/test.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.spec.ts",
    "src/**/*.d.ts"
  ]
}

[alan-agius4]

Hi @xiaoxiangmoe,

Kindly search for open issues and PRs, before opening a new one.

There is already a PR for this #17586 and is very close to get landed.

Thanks.

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