jest: doesn't seem to work with compilerOptions.paths option

According to this article, I have the following In my tsconfig.json: projects/core/tsconfig.spec.json

{
  "extends": "../../tsconfig.json",
  "compilerOptions": {
    "outDir": "../../out-tsc/spec",
    "module": "commonjs",
    "types": [
      "jest",
      "node"
    ],
    "allowJs": true,
  },
  "files": [
    "../../test.ts"
  ],
  "include": [
    "**/*.spec.ts",
    "**/*.d.ts"
  ]
}

tsconfig.spec.json // notice the paths

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "types": ["jest"],
    "lib": [
      "es2017",
      "esnext.asynciterable",
      "dom"
    ],
    "paths": {
      "@pwa/*": ["projects/pwa/src/app/*"],
      "@mobile/*": ["projects/mobile/src/app/*"],
      "@core/*": ["projects/core/src/*"],
      "@auth/*": ["projects/auth/src/*"]
    }
  }
}

the .spec file has an import like this:

import { something } from '@core/some.service';

This results in an error:

Cannot find module ‘@core/some.service’ from ‘some.service.spec.ts’

[just-jeb]

Yep, this is actually Jest’s problem. It doesn’t read the tsconfig.json neither does ts-jest . In fact, jest uses a bit different syntax for mappings. Check out this example, you have to add your mappings to your jest config under moduleNameMapper.

[just-jeb]

Not angular-builders issue