chore: bump to prettier 3

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: actionsx/prettier@v2
+      - uses: actionsx/prettier@v3
         with:
           args: --check "{src,test}/**/*.ts"
 

jest.config.cjs

@@ -0,0 +1,22 @@
+/** @type {import('jest').Config} */
+const config = {
+  preset: 'ts-jest/presets/default-esm',
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
+  transform: {
+    '^.+\\.tsx?$': [
+      'ts-jest',
+      {
+        useESM: true,
+        tsconfig: './tsconfig.jest.json',
+      },
+    ],
+  },
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+  // Jest snapshots are incompatible with prettier 3
+  prettierPath: require.resolve('prettier-2'),
+}
+
+module.exports = config