chore(server): introduce Jest (ts-jest)

packages/server/jest.config.js

@@ -0,0 +1,21 @@
+/* eslint-disable @typescript-eslint/no-var-requires */
+// This file is generated by `npx ts-jest config:init`, see https://github.com/kulshekhar/ts-jest/blob/102c829/README.md#getting-started
+const fs = require('fs')
+const path = require('path')
+const stripJsonComments = require('strip-json-comments')
+const { pathsToModuleNameMapper } = require('ts-jest/utils')
+
+const tsconfig = JSON.parse(
+  stripJsonComments(
+    fs.readFileSync(path.join(__dirname, 'tsconfig.json'), 'utf-8'),
+  ),
+)
+
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  // Doc: https://github.com/kulshekhar/ts-jest/blob/05916b9/docs/user/config/index.md#paths-mapping
+  moduleNameMapper: pathsToModuleNameMapper(tsconfig.compilerOptions.paths, {
+    prefix: '<rootDir>/',
+  }),
+}

packages/server/package.json

@@ -8,7 +8,8 @@
     "lint:eslint": "eslint . --ext .js,.ts --quiet",
     "lint:eslint:fix": "yarn run lint:eslint --fix",
     "lint:typecheck": "tsc --noEmit",
-    "format": "prettier --write '**/*.{js,ts,json,md}'"
+    "format": "prettier --write '**/*.{js,ts,json,md}'",
+    "test": "jest"
   },
   "dependencies": {
     "@mikro-orm/core": "^4.2.2",
@@ -27,6 +28,7 @@
     "@mikro-orm/migrations": "^4.2.3",
     "@types/dotenv-safe": "^8.1.1",
     "@types/express": "^4.17.8",
+    "@types/jest": "^26.0.15",
     "@types/node": "^14.14.3",
     "@typescript-eslint/eslint-plugin": "^4.5.0",
     "@typescript-eslint/parser": "^4.5.0",
@@ -37,9 +39,12 @@
     "eslint-plugin-prettier": "^3.1.4",
     "eslint-plugin-simple-import-sort": "^5.0.3",
     "husky": "^4.3.0",
+    "jest": "^26.6.3",
     "lint-staged": "^10.4.2",
     "npm-run-all": "^4.1.5",
     "prettier": "^2.1.2",
+    "strip-json-comments": "^3.1.1",
+    "ts-jest": "^26.4.4",
     "ts-node-dev": "^1.0.0",
     "tsconfig-paths": "^3.9.0",
     "typescript": "^4.0.3"

packages/server/tsconfig.json

@@ -42,10 +42,10 @@
 
     /* Module Resolution Options */
     "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
-    "baseUrl": "src" /* Base directory to resolve non-absolute module names. */,
+    "baseUrl": "." /* Base directory to resolve non-absolute module names. */,
     "paths": {
       /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
-      "~/*": ["*"]
+      "~/*": ["./src/*"]
     },
     // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
     // "typeRoots": [],                       /* List of folders to include type definitions from. */