Absolute Imports

TypeScript supports absolute imports. The preset (starting from v3.0.0) by default understands absolute imports referring to src, app, assets and environments directory, so instead:

import MyComponent from '../../src/app/my.component';
import MyStuff from '../../src/testing/my.stuff';

you can use:

import MyComponent from 'app/my.component';
import MyStuff from 'src/testing/my.stuff';

However, if your directory structure differ from that provided by angular-cli you can adjust moduleNameMapper in Jest config:

{
  jest: {
    moduleNameMapper: {
      'app/(.*)': '<rootDir>/src/to/app/$1', // override default, why not
      'testing/(.*)': '<rootDir>/app/testing/$1', // add new mapping
    },
  },
}

important

If you wish to use any absolute import paths which are defined in paths of your tsconfig, make sure that you create the similar mapping for moduleNameMapper in Jest config