Here's my `jest` config inside of `package.json`:

```
"jest": {
  "moduleFileExtensions": [
    "js",
    "json",
    "ts"
  ],
  "moduleDirectories":["node_modules", "src"], // tried to solve the issue like that
  "rootDir": "src",
  "testRegex": ".spec.ts$",
  "transform": {
    "^.+\\.(t|j)s$": "ts-jest"
  },
  "coverageDirectory": "../coverage",
  "testEnvironment": "node"
}

```

AFAIK Nest doesn't add jest.config file, so package.json is my best bet.

But after doing this, my code still fails:

```
yarn run v1.22.5
$ jest
 FAIL  src/auth/auth.service.spec.ts
  ● Test suite failed to run

    Cannot find module 'src/auth/auth.service' from 'auth/auth.service.spec.ts'

      3 | import * as moment from 'moment';
      4 | import { RedisService } from '@custom/redis-client'; // this is in node_modules
    > 5 | import { AuthService } from 'src/auth/auth.service';
        | ^
      6 | import { ConfigService } from 'src/config/config.service';
      7 |
      8 | describe('AuthService', () => {

      at Resolver.resolveModule (../node_modules/jest-resolve/build/index.js:306:11)
      at Object.<anonymous> (auth/auth.service.spec.ts:5:1)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        3.486 s
Ran all test suites.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

```

I also tried adding this to the `jest` config, as well as tsconfig:

```
"moduleNameMapper": {
  "src/(.*)": "<rootDir>/$1",
  "tests/(.*)": "<rootDir>/__tests__/$1"
},

```

But with this code I get:

```
yarn run v1.22.5
$ jest
 FAIL  src/auth/auth.service.spec.ts
  ● Test suite failed to run

    Configuration error:

    Could not locate module ./src/redis/redis.health.indicator mapped as:
    /home/aironside/Documents/sygnum/dev-environment/api-layer/src/$1.

    Please check your configuration for these entries:
    {
      "moduleNameMapper": {
        "/src\/(.*)/": "/home/aironside/Documents/sygnum/dev-environment/api-layer/src/$1"
      },
      "resolver": undefined
    }

      at createNoMappedModuleFoundError (../node_modules/jest-resolve/build/index.js:551:17)
      at Object.<anonymous> (../node_modules/@sygnum/redis-client/index.ts:1:1)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        3.183 s
Ran all test suites.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

```

What am I missing?

My full tsconfig:

```
{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowSyntheticDefaultImports": true,
    "target": "es2017",
    "sourceMap": true,
    "outDir": "./dist",
    "baseUrl": "./",
    "incremental": true,
    "rootDir": "./",
  }
}

```