diff --git a/.changeset/hungry-spies-build.md b/.changeset/hungry-spies-build.md
new file mode 100644
index 00000000..68ef5e8b
--- /dev/null
+++ b/.changeset/hungry-spies-build.md
@@ -0,0 +1,6 @@
+---
+'@hypermod/validator': patch
+'@hypermod/cli': patch
+---
+
+Various configuration changes in support of ESM.
diff --git a/jest.config.js b/jest.config.js
index 239ff437..48a2e68c 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,9 +1,22 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
 module.exports = {
+  testEnvironment: 'node',
   transform: {
-    '^.+\\.ts$': [
+    '\\.[jt]sx?$': [
       'ts-jest',
       {
         tsconfig: 'tsconfig.json',
+        diagnostics: { ignoreCodes: [1343] },
+        astTransformers: {
+          before: [
+            {
+              path: 'node_modules/ts-jest-mock-import-meta',
+              options: {
+                metaObjectReplacement: { url: 'https://www.url.com' },
+              },
+            },
+          ],
+        },
       },
     ],
   },
@@ -15,6 +28,7 @@ module.exports = {
     'jest-watch-typeahead/testname',
   ],
   moduleNameMapper: {
+    '(.+)\\.js$': '$1',
     '@hypermod/(.*)$': '<rootDir>/packages/$1/src',
     '@codeshift/(.*)$': '<rootDir>/packages/$1/src',
   },
diff --git a/package.json b/package.json
index 6a81d8c0..c54fe1fc 100644
--- a/package.json
+++ b/package.json
@@ -69,6 +69,7 @@
     "semver": "^7.3.5",
     "tar": "^6.1.0",
     "ts-jest": "^29.2.5",
+    "ts-jest-mock-import-meta": "^1.2.0",
     "ts-loader": "^6.2.1",
     "ts-node": "^10.9.1",
     "tslib": "^2.2.0",
diff --git a/packages/cli/src/main.ts b/packages/cli/src/main.ts
index bfeb954e..bd076c4e 100644
--- a/packages/cli/src/main.ts
+++ b/packages/cli/src/main.ts
@@ -112,21 +112,33 @@ export default async function main(
        */
       const configFilePath = await findUp([
         'hypermod.config.js',
+        'hypermod.config.mjs',
+        'hypermod.config.cjs',
         'hypermod.config.ts',
         'hypermod.config.tsx',
         'src/hypermod.config.js',
+        'src/hypermod.config.mjs',
+        'src/hypermod.config.cjs',
         'src/hypermod.config.ts',
         'src/hypermod.config.tsx',
         'codemods/hypermod.config.js',
+        'codemods/hypermod.config.mjs',
+        'codemods/hypermod.config.cjs',
         'codemods/hypermod.config.ts',
         'codemods/hypermod.config.tsx',
         'codeshift.config.js',
+        'codeshift.config.mjs',
+        'codeshift.config.cjs',
         'codeshift.config.ts',
         'codeshift.config.tsx',
         'src/codeshift.config.js',
+        'src/codeshift.config.mjs',
+        'src/codeshift.config.cjs',
         'src/codeshift.config.ts',
         'src/codeshift.config.tsx',
         'codemods/codeshift.config.js',
+        'codemods/codeshift.config.mjs',
+        'codemods/codeshift.config.cjs',
         'codemods/codeshift.config.ts',
         'codemods/codeshift.config.tsx',
       ]);
diff --git a/packages/fetcher/src/index.spec.ts b/packages/fetcher/src/index.spec.ts
index ca191032..cab513d3 100644
--- a/packages/fetcher/src/index.spec.ts
+++ b/packages/fetcher/src/index.spec.ts
@@ -15,7 +15,7 @@ const mockBasePath = path.join(__dirname, 'path', 'to');
 
 const mockConfig = {
   transforms: {
-    '10.0.0': 'path/to/transform.js',
+    '10.0.0': 'path/to/transform.ts',
   },
 };
 
@@ -23,7 +23,7 @@ describe('fetcher', () => {
   let mockMatchedPaths: string[] = [];
 
   beforeEach(() => {
-    mockMatchedPaths = [path.join(mockBasePath, 'hypermod.config.js')];
+    mockMatchedPaths = [path.join(mockBasePath, 'hypermod.config.ts')];
 
     (globby as unknown as jest.Mock).mockImplementation(() =>
       Promise.resolve(mockMatchedPaths),
@@ -38,10 +38,10 @@ describe('fetcher', () => {
 
   describe('fetchConfig', () => {
     it('fetches config with default export', async () => {
-      const mockFilePath = `${__dirname}/path/to/hypermod.config.js`;
+      const mockFilePath = `${__dirname}/path/to/hypermod.config.ts`;
 
       jest.mock(
-        `${__dirname}/path/to/hypermod.config.js`,
+        `${__dirname}/path/to/hypermod.config.ts`,
         () => ({ __esModule: true, default: mockConfig }),
         { virtual: true },
       );
@@ -54,7 +54,7 @@ describe('fetcher', () => {
 
     it('fetches config with named export', async () => {
       jest.mock(
-        path.join(mockBasePath, 'hypermod.config.js'),
+        path.join(mockBasePath, 'hypermod.config.ts'),
         () => mockConfig,
         {
           virtual: true,
@@ -65,7 +65,7 @@ describe('fetcher', () => {
 
       expect(configMeta!.config).toEqual(mockConfig);
       expect(configMeta!.filePath).toEqual(
-        path.join(mockBasePath, 'hypermod.config.js'),
+        path.join(mockBasePath, 'hypermod.config.ts'),
       );
     });
 
@@ -106,7 +106,7 @@ describe('fetcher', () => {
 
   describe('fetchPackage', () => {
     it('correctly fetches package and returns a config', async () => {
-      const mockFilePath = 'path/to/config.hypermod.js';
+      const mockFilePath = 'path/to/config.hypermod.ts';
       const mockPackageManager = {
         install: jest.fn(),
         getInfo: jest.fn().mockReturnValue({ location: mockFilePath }),
@@ -154,7 +154,7 @@ describe('fetcher', () => {
 
       expect(configMeta!.config).toEqual(mockConfig);
       expect(configMeta!.filePath).toEqual(
-        mockBasePath + '/hypermod.config.js',
+        mockBasePath + '/hypermod.config.ts',
       );
     });
 
@@ -177,7 +177,7 @@ describe('fetcher', () => {
         install: jest.fn(),
         require: jest.fn().mockReturnValueOnce(mockConfig),
         getInfo: jest.fn().mockReturnValue({
-          location: mockBasePath + '/index.js',
+          location: mockBasePath + '/index.ts',
         }),
       };
 
@@ -187,7 +187,7 @@ describe('fetcher', () => {
       );
 
       expect(configMeta!.config).toEqual(mockConfig);
-      expect(configMeta!.filePath).toEqual(mockBasePath + '/index.js');
+      expect(configMeta!.filePath).toEqual(mockBasePath + '/index.ts');
     });
 
     it('throws if entrypoint-based config does not contain a valid config (and there are no config files available elsewhere)', async () => {
@@ -195,7 +195,7 @@ describe('fetcher', () => {
         install: jest.fn(),
         require: jest.fn().mockReturnValueOnce({}),
         getInfo: jest.fn().mockReturnValue({
-          location: mockBasePath + '/index.js',
+          location: mockBasePath + '/index.ts',
         }),
       };
 
diff --git a/packages/validator/src/index.ts b/packages/validator/src/index.ts
index 1e279f7f..2e1b69ed 100644
--- a/packages/validator/src/index.ts
+++ b/packages/validator/src/index.ts
@@ -13,7 +13,7 @@ function hasValidPresets(config: Config): boolean {
   if (!config.presets) return true;
 
   return Object.entries(config.presets).every(([key]) =>
-    key.match(/^[0-9a-zA-Z\-]+$/),
+    key.match(/^[0-9a-zA-Z\-\.]+$/),
   );
 }
 
diff --git a/yarn.lock b/yarn.lock
index 8ae2faee..52408ee3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7981,6 +7981,11 @@ trim-newlines@^3.0.0:
   resolved "https://registry.npmjs.org/trim-newlines/-/trim-newlines-3.0.1.tgz"
   integrity sha512-c1PTsA3tYrIsLGkJkzHF+w9F2EyxfXGo4UyJc4pFL++FMjnq0HJS69T3M7d//gKrFKwy429bouPescbjecU+Zw==
 
+ts-jest-mock-import-meta@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/ts-jest-mock-import-meta/-/ts-jest-mock-import-meta-1.2.0.tgz#6fb12a1fa47f70f9335a288e888cbacf592c4dc1"
+  integrity sha512-r2+TH6d8LHBXqLTXjJh1KfTZoMvGV0hdn9gwickNVcwS2Co2/mewGjj0XDVEPLg5MVfZVHUFQ9O09anURA3KCw==
+
 ts-jest@^29.2.5:
   version "29.2.5"
   resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-29.2.5.tgz#591a3c108e1f5ebd013d3152142cb5472b399d63"