diff --git a/global.d.ts b/global.d.ts
new file mode 100644
index 00000000..9e6c1dbd
--- /dev/null
+++ b/global.d.ts
@@ -0,0 +1 @@
+import 'jest-extended';
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 00000000..ae1c852d
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,26 @@
+module.exports = {
+  preset: 'ts-jest',
+
+  testEnvironment: 'node',
+  testRegex: 'test\\/.*\\.ts$',
+  testMatch: null,
+  testURL: 'http://localhost/',
+  testTimeout: 15000,
+
+  coverageDirectory: 'coverage',
+  collectCoverage: true,
+
+  setupFilesAfterEnv: ['jest-extended'],
+
+  moduleNameMapper: {
+    '^ky$': require.resolve('ky').replace('index.js', 'umd.js'),
+  },
+
+  globals: {
+    'ts-jest': {
+      diagnostics: {
+        ignoreCodes: [2339],
+      },
+    },
+  },
+};
diff --git a/jest.config.json b/jest.config.json
deleted file mode 100644
index 0fedac97..00000000
--- a/jest.config.json
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-  "preset": "ts-jest",
-
-  "testEnvironment": "node",
-  "testRegex": "test\\/.*\\.ts$",
-  "testMatch": null,
-  "testURL": "http://localhost/",
-
-  "coverageDirectory": "./coverage/",
-
-  "setupFilesAfterEnv": ["jest-extended"],
-
-  "globals": {
-    "ts-jest": {
-      "diagnostics": {
-        "ignoreCodes": [2339]
-      }
-    }
-  }
-}