Jest with TypeScript aliases

jest.config.js

module.exports = {
  globals: {
    'ts-jest': {
      compiler: 'ttypescript',
    },
  },
  bail: 1,
  clearMocks: true,
  collectCoverage: true,
  collectCoverageFrom: ['./src/app/**/*.(ts|js)', './src/lib/Mail.ts'],
  coverageDirectory: './__tests__/coverage',
  coverageReporters: ['json', 'lcov'],
  moduleFileExtensions: ['js', 'json', 'ts', 'node'],
  // The pattern of the aliases on the Jest config are different.
  moduleNameMapper: {
    'src/(.*)': '<rootDir>/src/$1',
  },
  preset: 'ts-jest',
  setupFilesAfterEnv: ['jest-extended'],
  testEnvironment: 'node',
  testMatch: ['**/__tests__/**/*.test.{js,ts}'],
  transform: {
    '^.+\\.(ts|js)$': 'ts-jest',
  },
};

package.json

{
  "name": "fintech",
  "version": "1.0.0",
  "main": "index.js",
  "author": "Victor Batalha <[email protected]>",
  "license": "MIT",
  "private": true,
  "scripts": {
    "dev": "ts-node-dev -r tsconfig-paths/register --respawn --transpileOnly ./src/server",
    // We use ttypescript to compile, so the aliases can be transformed with to relative paths.
    // Also, specify the tsconfig file so it won't build the tests.
    "build": "yarn ttsc -p tsconfig.build.json",
    // Workaround to put the views folder inside the build folder. Might have a better way to do this.
    "postbuild": "cp -r ./src/app/views ./build/app/views",
    "test": "jest --runInBand --forceExit",
},
  "dependencies": {
  },
  "devDependencies": {
    "@types/node": "^13.9.8",
    "@typescript-eslint/eslint-plugin": "^2.26.0",
    "@typescript-eslint/parser": "^2.26.0",
    "eslint": "^6.8.0",
    "eslint-config-airbnb-base": "^14.1.0",
    "eslint-config-prettier": "^6.10.1",
    "eslint-import-resolver-typescript": "^2.0.0",
    "eslint-plugin-import": "^2.20.2",
    "eslint-plugin-prettier": "^3.1.2",
    "jest": "^25.2.4",
    "jest-extended": "^0.11.5",
    "prettier": "^2.0.2",
    "supertest": "^4.0.2",
    "ts-jest": "^25.3.0",
    "ts-node": "^8.8.1",
    "ts-node-dev": "^1.0.0-pre.44",
    "ttypescript": "^1.5.10",
    // Allow custom transforms when compiling TypeScript files.
    "typescript": "^3.8.3",
    "typescript-eslint-parser": "^22.0.0",
    // Used to transform the absolute paths to relative paths together with ttypescript.
    "typescript-transform-paths": "^1.1.14"
  }
}

tsconfig.build.json

// Used for build the project without the tests.
{
  "extends": "./tsconfig.json",
  "include": ["src/**/*"],
  "exclude": ["node_modules"]
}

tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "esModuleInterop": true,
    "moduleResolution": "node",
    "module": "commonjs",
    "lib": ["ES6"],

    "baseUrl": "src",

    "outDir": "./build",
    "paths": {
      "src/*": ["*"],
    },
    // Transform the absolute imports into relative imports on compile.
    "plugins": [
      { "transform": "typescript-transform-paths" },
      { "transform": "typescript-transform-paths", "afterDeclarations": true }
    ],

    "typeRoots": ["./node_modules/@types", "./typings"],

    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "types": ["jest"]
  },
  // Needed to put the tests folder so the TypeScript can recognize the path aliases within the tests.
  "include": ["src/**/*", "__tests__/**/*"],
  "exclude": ["node_modules"]
}