Configure jest to use tsconfig.json

Author: socsieng

jest.config.js

@@ -1,4 +1,8 @@
 module.exports = {
+  preset: "ts-jest",
+  setupFiles: [
+    'core-js'
+  ],
   roots: [
     '<rootDir>/bin',
     '<rootDir>/src',
@@ -12,4 +16,9 @@ module.exports = {
   transform: {
     '^.+\\.(ts|tsx)?$': 'ts-jest'
   },
+  globals: {
+    'ts-jest': {
+      tsConfig: 'tsconfig.json',
+    }
+  }
 }

package-lock.json

@@ -11,10 +11,10 @@
   },
   "scripts": {
     "prepublishOnly": "npm run ci",
-    "ci": "DEBUG_MODE=none jest --ci && npm run build",
+    "ci": "DEBUG_MODE=none npm run build && jest --ci",
     "build": "rimraf dist && rollup -c",
-    "test:watch": "jest --watch",
-    "test": "jest --verbose"
+    "test:watch": "npm run build && jest --watch",
+    "test": "npm run build && jest --verbose"
   },
   "files": [
     "dist",
@@ -35,6 +35,7 @@
     "@types/jest": "^24.0.25",
     "@typescript-eslint/eslint-plugin": "^2.15.0",
     "@typescript-eslint/parser": "^2.15.0",
+    "core-js": "^3.6.4",
     "eslint": "^6.8.0",
     "glob": "^7.1.6",
     "jest": "^24.9.0",

package.json

@@ -16,7 +16,7 @@ const writeOutput = process.env['DEBUG_MODE'] !== 'none';
 
 const folders = ['test-data/**/*input.ts', 'test-data/**/*input.d.ts', 'test-data/**/*exact.d.ts']
   .map(f => glob.sync(f, { cwd: __dirname }))
-  .reduce((allFiles, files) => [...allFiles, ...files], [])
+  .flat()
   .map(f => [f]);
 
 function createApplication(logOutput: string[]) {