Added Typescript support in Jest

Luciano Nooijen · Luciano Nooijen · commit 3865bc82e885 · 2018-11-20T16:17:28.000+01:00
diff --git a/jest.config.js b/jest.config.js
@@ -63,13 +63,14 @@ module.exports = {
   // ],
 
   // An array of file extensions your modules use
-  // moduleFileExtensions: [
-  //   "js",
-  //   "json",
-  //   "jsx",
-  //   "node"
-  // ],
-
+  moduleFileExtensions: [
+    "ts",
+    "tsx",
+    "js",
+    "jsx",
+    "json",
+    "node"
+  ],
   // A map from regular expressions to module names that allow to stub out resources with a single module
   // moduleNameMapper: {},
 
@@ -144,7 +145,7 @@ module.exports = {
   // ],
 
   // The regexp pattern Jest uses to detect test files
-  // testRegex: "",
+  testRegex: "tests\/(.*).(test|spec).ts?",
 
   // This option allows the use of a custom results processor
   // testResultsProcessor: null,
@@ -159,7 +160,9 @@ module.exports = {
   // timers: "real",
 
   // A map from regular expressions to paths to transformers
-  // transform: null,
+  transform: {
+    "^.+\\.tsx?$": "ts-jest"
+  },
 
   // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
   // transformIgnorePatterns: [
diff --git a/package.json b/package.json
@@ -25,7 +25,7 @@
     "node": ">=8.0.0"
   },
   "scripts": {
-    "dev": "nodemon server/server.js",
+    "dev": "ts-node server/server.ts",
     "start": "node server/server.js",
     "lint": "eslint --ext .jsx,.js,.ts .",
     "test": "NODE_ENV=test jest -i",
@@ -44,9 +44,16 @@
     "morgan": "^1.9.1",
     "pg": "^7.6.0",
     "sqreen": "^1.26.2",
+    "ts-node": "^7.0.1",
+    "typescript": "^3.1.6",
     "yarn": "^1.12.1"
   },
   "devDependencies": {
+    "@types/eslint": "^4.16.4",
+    "@types/express": "^4.16.0",
+    "@types/jest": "^23.3.9",
+    "@types/knex": "^0.15.1",
+    "@types/node": "^10.12.9",
     "babel-eslint": "^10.0.1",
     "eslint": "^4.19.1",
     "eslint-config-airbnb": "^16.1.0",
@@ -64,7 +71,9 @@
     "prettierrc": "^0.0.0-5",
     "response-time": "^2.3.2",
     "sqlite3": "^4.0.3",
-    "supertest": "^3.3.0"
+    "supertest": "^3.3.0",
+    "ts-jest": "^23.10.4",
+    "typescript-eslint-parser": "^21.0.1"
   },
   "env": {
     "params": {
diff --git a/server/server.ts b/server/server.ts
diff --git a/tests/app.test.ts b/tests/app.test.ts
@@ -1,5 +1,5 @@
+import useTestDatabase from './config/database-config';
 const { knex } = require('../helpers');
-const { useTestDatabase } = require('./config');
 
 useTestDatabase();
 
diff --git a/tests/config/database-config.ts b/tests/config/database-config.ts
@@ -14,4 +14,4 @@ const useTestDatabase = () => {
     afterAll(() => knex.destroy());
 };
 
-module.exports = useTestDatabase;
+export default useTestDatabase;
diff --git a/tests/config/index.js b/tests/config/index.js
diff --git a/tests/config/index.ts b/tests/config/index.ts
@@ -0,0 +1,8 @@
+import useTestDatabase from './database-config';
+import useEnvVars from './database-config';
+
+export default {
+    useTestDatabase,
+    useEnvVars,
+};
+
diff --git a/tests/config/load-env-file.ts b/tests/config/load-env-file.ts
@@ -29,4 +29,4 @@ const useEnvVars = () => {
         }));
 };
 
-module.exports = useEnvVars;
+export default useEnvVars;
diff --git a/tests/database/authors.test.ts b/tests/database/authors.test.ts
@@ -1,4 +1,4 @@
-const { useTestDatabase } = require('../config');
+import useTestDatabase from "../config/database-config";
 const {
     listAuthors,
     getAuthor,
diff --git a/tests/database/users.test.ts b/tests/database/users.test.ts
@@ -1,4 +1,4 @@
-const { useTestDatabase } = require('../config');
+import useTestDatabase from '../config/database-config';
 const {
     listUsers,
     getUser,
diff --git a/tests/knexfile-generator.test.ts b/tests/knexfile-generator.test.ts
@@ -1,6 +1,7 @@
 /* eslint-disable function-paren-newline */
 
-const { useEnvVars } = require('./config');
+import useEnvVars from './config/load-env-file';
+
 const generateKnexConfig = require('../database/generate-knexfile');
 const {
     getNodeEnvSpecificDefaults,
diff --git a/yarn.lock b/yarn.lock

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-const { useTestDatabase } = require('../config');`
	`1`	`+import useTestDatabase from "../config/database-config";`
`2`	`2`	`const {`
`3`	`3`	`listAuthors,`
`4`	`4`	`getAuthor,`
Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-const { useTestDatabase } = require('../config');`
	`1`	`+import useTestDatabase from '../config/database-config';`
`2`	`2`	`const {`
`3`	`3`	`listUsers,`
`4`	`4`	`getUser,`