diff --git a/.eslintrc.jest.yml b/.eslintrc.jest.yml
index 4340ddd..0255384 100644
--- a/.eslintrc.jest.yml
+++ b/.eslintrc.jest.yml
@@ -8,3 +8,4 @@ rules:
   react/display-name: off
   # Disable for convenience
   react/prop-types: off
+  '@typescript-eslint/no-require-imports': off
diff --git a/.eslintrc.production.yml b/.eslintrc.production.yml
index ba58e9f..b63635d 100644
--- a/.eslintrc.production.yml
+++ b/.eslintrc.production.yml
@@ -30,7 +30,11 @@ rules:
   import/no-anonymous-default-export: error
   import/no-duplicates: error
   import/no-namespace: error
-  import/no-unassigned-import: error
+  import/no-unassigned-import:
+    - error
+    - allow:
+      - '**/*.css'
+      - dotenv/config
 settings:
   import/extensions:
     - .cjs
diff --git a/.eslintrc.react.yml b/.eslintrc.react.yml
index 923e17c..914d633 100644
--- a/.eslintrc.react.yml
+++ b/.eslintrc.react.yml
@@ -2,6 +2,3 @@ extends:
   - plugin:react/recommended
 plugins:
   - react
-settings:
-  react:
-    version: 18.2.0
diff --git a/.eslintrc.typescript.yml b/.eslintrc.typescript.yml
index 3ea0b00..5de2aeb 100644
--- a/.eslintrc.typescript.yml
+++ b/.eslintrc.typescript.yml
@@ -4,6 +4,9 @@ parser: '@typescript-eslint/parser'
 plugins:
   - '@typescript-eslint'
 rules:
+  # Shortening if-statement into &&, ||, or ternary operators.
+  '@typescript-eslint/no-unused-expressions': off
+
   '@typescript-eslint/no-unused-vars':
     - error
     - argsIgnorePattern: ^_
diff --git a/.github/workflows/prepare-release.yml b/.github/workflows/prepare-release.yml
index 53e0965..d36f52f 100644
--- a/.github/workflows/prepare-release.yml
+++ b/.github/workflows/prepare-release.yml
@@ -1,7 +1,17 @@
 name: Prepare release
 
 on:
-  workflow_dispatch: {}
+  workflow_dispatch:
+    inputs:
+      version-to-bump:
+        default: patch
+        description: Version to bump
+        options:
+          - major
+          - minor
+          - patch
+        required: true
+        type: choice
 
 jobs:
   call-workflow:
@@ -10,3 +20,5 @@ jobs:
       id-token: write
     secrets: inherit
     uses: compulim/workflows/.github/workflows/prepare-release.yml@main
+    with:
+      version-to-bump: ${{ inputs.version-to-bump }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 359d8b5..dc82f46 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Changed
 
+- 💢 Moved to ESM only, in PR [#27](https://github.com/compulim/version-from-git/pull/27)
 - Ported to TypeScript, in PR [#24](https://github.com/compulim/version-from-git/pull/24)
 - Bumped dependencies, in PR [#23](https://github.com/compulim/version-from-git/pull/23)
    - Production dependencies
diff --git a/package.json b/package.json
index a1cde0b..092c117 100644
--- a/package.json
+++ b/package.json
@@ -10,12 +10,11 @@
   ],
   "scripts": {
     "build": "npm run build --if-present --workspaces",
-    "bump": "npm run bump:prod && npm run bump:dev && npm run bump:auditfix && npm run bump:packages && npm run bump:eslintrc",
-    "bump:auditfix": "npm audit fix || exit 0",
-    "bump:dev": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.localPeerDependencies // {}) as $L | (.devDependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@latest\") | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
+    "bump": "npm run bump:prod && npm run bump:dev && npm run bump:packages && npm run bump:eslintrc",
+    "bump:dev": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.pinDependencies // {}) as $P | (.localPeerDependencies // {}) as $L | (.devDependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@\" + ($P[.key] // [\"latest\"])[0]) | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
     "bump:eslintrc": "if [ -f node_modules/react/package.json ]; then docker run -e VERSION=$(cat node_modules/react/package.json | jq -r '.version') -i --rm mikefarah/yq '.settings.react.version = strenv(VERSION)' < ./.eslintrc.react.yml | tee /tmp/output.tmp && mv /tmp/output.tmp ./.eslintrc.react.yml; fi",
     "bump:packages": "npm run bump --if-present --workspaces",
-    "bump:prod": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.localPeerDependencies // {}) as $L | (.dependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@latest\") | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
+    "bump:prod": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.pinDependencies // {}) as $P | (.localPeerDependencies // {}) as $L | (.dependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@\" + ($P[.key] // [\"latest\"])[0]) | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
     "postscaffold": "npm run postscaffold:eslint:react && npm run postscaffold --if-present --workspaces",
     "postscaffold:eslint:react": "npm run bump:eslintrc",
     "precommit": "npm run precommit --if-present --workspaces",
diff --git a/packages/integration-test/.eslintrc.custom.yml b/packages/integration-test/.eslintrc.custom.yml
new file mode 100644
index 0000000..5c9fc4c
--- /dev/null
+++ b/packages/integration-test/.eslintrc.custom.yml
@@ -0,0 +1,2 @@
+env:
+  browser: true
diff --git a/packages/integration-test/.eslintrc.yml b/packages/integration-test/.eslintrc.yml
new file mode 100644
index 0000000..54b2959
--- /dev/null
+++ b/packages/integration-test/.eslintrc.yml
@@ -0,0 +1,2 @@
+extends:
+  - ./.eslintrc.custom.yml
diff --git a/packages/integration-test/.gitignore b/packages/integration-test/.gitignore
new file mode 100644
index 0000000..936e5c5
--- /dev/null
+++ b/packages/integration-test/.gitignore
@@ -0,0 +1,2 @@
+/node_modules/
+/package-lock.json
diff --git a/packages/integration-test/jest.config.json b/packages/integration-test/jest.config.json
new file mode 100644
index 0000000..9c305d4
--- /dev/null
+++ b/packages/integration-test/jest.config.json
@@ -0,0 +1,38 @@
+{
+  "testMatch": ["**/__tests__/**/*.?([cm])[jt]s?(x)", "**/?(*.)+(spec|test).?([cm])[jt]s?(x)"],
+  "transform": {
+    "\\.cjsx?$": [
+      "babel-jest",
+      {
+        "presets": [
+          [
+            "@babel/preset-react",
+            {
+              "runtime": "classic"
+            }
+          ]
+        ]
+      }
+    ],
+    "\\.mjsx?$": [
+      "babel-jest",
+      {
+        "presets": [
+          [
+            "@babel/preset-react",
+            {
+              "runtime": "classic"
+            }
+          ],
+          [
+            "@babel/preset-env",
+            {
+              "modules": "commonjs",
+              "targets": "defaults"
+            }
+          ]
+        ]
+      }
+    ]
+  }
+}
diff --git a/packages/integration-test/tsconfig.custom.json b/packages/integration-test/tsconfig.custom.json
new file mode 100644
index 0000000..7a3b017
--- /dev/null
+++ b/packages/integration-test/tsconfig.custom.json
@@ -0,0 +1,3 @@
+{
+  "extends": "@tsconfig/strictest/tsconfig.json"
+}
diff --git a/packages/integration-test/tsconfig.json b/packages/integration-test/tsconfig.json
new file mode 100644
index 0000000..d910d6b
--- /dev/null
+++ b/packages/integration-test/tsconfig.json
@@ -0,0 +1,7 @@
+// This configuration file is for VSCode only.
+{
+  "compilerOptions": {
+    "jsx": "react"
+  },
+  "extends": "./tsconfig.custom.json"
+}
diff --git a/packages/pages/.eslintrc.custom.yml b/packages/pages/.eslintrc.custom.yml
new file mode 100644
index 0000000..e69de29
diff --git a/packages/pages/.eslintrc.yml b/packages/pages/.eslintrc.yml
new file mode 100644
index 0000000..a8f533d
--- /dev/null
+++ b/packages/pages/.eslintrc.yml
@@ -0,0 +1,4 @@
+env:
+  browser: true
+extends:
+  - ./.eslintrc.custom.yml
diff --git a/packages/pages/.gitignore b/packages/pages/.gitignore
new file mode 100644
index 0000000..eab9b2f
--- /dev/null
+++ b/packages/pages/.gitignore
@@ -0,0 +1,2 @@
+/node_modules/
+/public/static/
diff --git a/packages/pages/src/tsconfig.custom.json b/packages/pages/src/tsconfig.custom.json
new file mode 100644
index 0000000..7a3b017
--- /dev/null
+++ b/packages/pages/src/tsconfig.custom.json
@@ -0,0 +1,3 @@
+{
+  "extends": "@tsconfig/strictest/tsconfig.json"
+}
diff --git a/packages/pages/src/tsconfig.json b/packages/pages/src/tsconfig.json
new file mode 100644
index 0000000..017f0c9
--- /dev/null
+++ b/packages/pages/src/tsconfig.json
@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "allowImportingTsExtensions": true,
+    "esModuleInterop": true,
+    "jsx": "react",
+    "lib": [
+      "DOM",
+      "ESNext",
+      "WebWorker"
+    ],
+    "moduleResolution": "Bundler",
+    "noEmit": true,
+    "strict": true,
+    "target": "ESNext",
+    "types": []
+  },
+  "extends": "./tsconfig.custom.json"
+}
diff --git a/packages/version-from-git/.eslintrc.custom.yml b/packages/version-from-git/.eslintrc.custom.yml
new file mode 100644
index 0000000..e69de29
diff --git a/packages/version-from-git/.eslintrc.yml b/packages/version-from-git/.eslintrc.yml
new file mode 100644
index 0000000..54b2959
--- /dev/null
+++ b/packages/version-from-git/.eslintrc.yml
@@ -0,0 +1,2 @@
+extends:
+  - ./.eslintrc.custom.yml
diff --git a/packages/version-from-git/__tests__/__setup__/typingTestTransformer.js b/packages/version-from-git/__tests__/__setup__/typingTestTransformer.js
new file mode 100644
index 0000000..b8d3ed5
--- /dev/null
+++ b/packages/version-from-git/__tests__/__setup__/typingTestTransformer.js
@@ -0,0 +1,89 @@
+// Notes: to test changes in this file, run "jest" with "--no-cache" argument.
+
+const run = ({ filename }) => {
+  const escapeStringRegexp = require('escape-string-regexp');
+  const fs = require('fs/promises');
+  const { extname } = require('path');
+  const typeScript = require('typescript');
+
+  const TS_EXPECT_ERROR = /(\/\/\s+)(@ts-expect-error)[\s+(.*)]/gu;
+  const TSCONFIG = {
+    allowImportingTsExtensions: true,
+    allowSyntheticDefaultImports: true,
+    jsx: typeScript.JsxEmit.React,
+    noEmit: true,
+    skipLibCheck: true,
+    strict: true
+  };
+
+  async function compile(filename) {
+    const program = typeScript.createProgram([filename], TSCONFIG);
+
+    const emitResult = program.emit();
+    const allDiagnostics = typeScript.getPreEmitDiagnostics(program).concat(emitResult.diagnostics);
+
+    allDiagnostics.forEach(({ file, messageText, start }) => {
+      if (file && start) {
+        const { line, character } = file.getLineAndCharacterOfPosition(start);
+        const message = typeScript.flattenDiagnosticMessageText(messageText, '\n');
+
+        throw new Error(`Failed to compile ${file.fileName} (${line + 1},${character + 1}): ${message}`);
+      } else {
+        throw new Error(typeScript.flattenDiagnosticMessageText(messageText, '\n'));
+      }
+    });
+  }
+
+  async function checkExpectError(filename) {
+    const sourceText = await fs.readFile(filename, 'utf-8');
+    const sourceTextWithoutExpectError = sourceText.replace(TS_EXPECT_ERROR, '$1');
+
+    const extension = extname(filename);
+    const tempFilename = filename.substring(0, filename.length - extension.length) + `.tmp${extension}`;
+
+    await fs.writeFile(tempFilename, sourceTextWithoutExpectError);
+
+    try {
+      const program = typeScript.createProgram([tempFilename], TSCONFIG);
+
+      const emitResult = program.emit();
+      const allDiagnostics = typeScript.getPreEmitDiagnostics(program).concat(emitResult.diagnostics);
+
+      allDiagnostics.forEach(({ file, messageText, start }) => {
+        if (file && start) {
+          const { line } = file.getLineAndCharacterOfPosition(start);
+          const message = typeScript.flattenDiagnosticMessageText(messageText, '\n');
+
+          const expectedErrorLine = file.getFullText().split('\n')[line - 1];
+          const expectedError = expectedErrorLine?.replace(/\s*\/\/\s+/u, '').trim();
+          let expectedErrors = [expectedError];
+
+          try {
+            const parsed = JSON.parse(expectedError);
+
+            if (Array.isArray(expectedErrors) && expectedErrors.every(value => typeof value === 'string')) {
+              expectedErrors = parsed;
+            }
+          } catch {}
+
+          expect(message).toEqual(expect.stringMatching(new RegExp(expectedErrors.map(escapeStringRegexp).join('|'))));
+        } else {
+          throw new Error(typeScript.flattenDiagnosticMessageText(messageText, '\n'));
+        }
+      });
+    } finally {
+      fs.unlink(tempFilename);
+    }
+  }
+
+  describe(filename, () => {
+    test('should succeed', () => compile(filename));
+    test('should have @ts-expect-error describing compile errors correctly', () => checkExpectError(filename));
+  });
+};
+
+module.exports = {
+  process(_, filename) {
+    return { code: `(${run})(${JSON.stringify({ filename })})` };
+  }
+};
diff --git a/packages/version-from-git/__tests__/types/.gitignore b/packages/version-from-git/__tests__/types/.gitignore
new file mode 100644
index 0000000..5ad8225
--- /dev/null
+++ b/packages/version-from-git/__tests__/types/.gitignore
@@ -0,0 +1 @@
+*.tmp.tsx
diff --git a/packages/version-from-git/jest.config.json b/packages/version-from-git/jest.config.json
new file mode 100644
index 0000000..d49d9d7
--- /dev/null
+++ b/packages/version-from-git/jest.config.json
@@ -0,0 +1,40 @@
+{
+  "testPathIgnorePatterns": [
+    "/__setup__/",
+    "/lib/",
+    "/node_modules/",
+    "/__types__/",
+    "\\.pnp\\.[^\\/]+$"
+  ],
+  "transform": {
+    "/__tests__/types/": [
+      "<rootDir>/__tests__/__setup__/typingTestTransformer.js"
+    ],
+    "\\.[jt]sx?$": [
+      "babel-jest",
+      {
+        "presets": [
+          [
+            "@babel/preset-typescript",
+            {
+              "allowDeclareFields": true
+            }
+          ],
+          [
+            "@babel/preset-env",
+            {
+              "modules": "commonjs",
+              "targets": {
+                "node": "18"
+              }
+            }
+          ]
+        ],
+        "sourceMaps": true
+      }
+    ]
+  },
+  "watchPathIgnorePatterns": [
+    "\\.tmp\\."
+  ]
+}
diff --git a/packages/version-from-git/package.json b/packages/version-from-git/package.json
index 2e11b3c..9e28d0a 100644
--- a/packages/version-from-git/package.json
+++ b/packages/version-from-git/package.json
@@ -5,18 +5,18 @@
   "files": [
     "./dist/"
   ],
-  "main": "./dist/version-from-git.mjs",
+  "type": "module",
+  "main": "./dist/version-from-git.js",
   "bin": {
-    "version-from-git": "./dist/version-from-git.mjs"
+    "version-from-git": "./dist/version-from-git.js"
   },
   "scripts": {
     "build": "tsup-node",
-    "bump": "npm run bump:prod && npm run bump:dev && npm run bump:auditfix",
-    "bump:auditfix": "npm audit fix || exit 0",
-    "bump:dev": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.localPeerDependencies // {}) as $L | (.devDependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@latest\") | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
-    "bump:prod": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.localPeerDependencies // {}) as $L | (.dependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@latest\") | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
+    "bump": "npm run bump:prod && npm run bump:dev",
+    "bump:dev": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.pinDependencies // {}) as $P | (.localPeerDependencies // {}) as $L | (.devDependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@\" + ($P[.key] // [\"latest\"])[0]) | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
+    "bump:prod": "PACKAGES_TO_BUMP=$(cat package.json | jq -r '(.pinDependencies // {}) as $P | (.localPeerDependencies // {}) as $L | (.dependencies // {}) | to_entries | map(select(.key as $K | $L | has($K) | not)) | map(.key + \"@\" + ($P[.key] // [\"latest\"])[0]) | join(\" \")') && [ ! -z \"$PACKAGES_TO_BUMP\" ] && npm install $PACKAGES_TO_BUMP || true",
     "precommit": "npm run precommit:eslint && npm run precommit:publint && npm run precommit:typescript:production",
-    "precommit:eslint": "eslint ./src/",
+    "precommit:eslint": "ESLINT_USE_FLAT_CONFIG=false eslint ./src/",
     "precommit:publint": "publint",
     "precommit:typescript:production": "tsc --noEmit --project ./src/tsconfig.precommit.production.json",
     "-precommit:typescript:test": "tsc --noEmit --project ./src/tsconfig.precommit.test.json",
diff --git a/packages/version-from-git/src/index.mts b/packages/version-from-git/src/index.ts
similarity index 99%
rename from packages/version-from-git/src/index.mts
rename to packages/version-from-git/src/index.ts
index a78993c..7880b03 100755
--- a/packages/version-from-git/src/index.mts
+++ b/packages/version-from-git/src/index.ts
@@ -12,6 +12,7 @@ import { major, minor, patch } from 'semver';
 
 const { green, magenta, red, yellow } = chalk;
 const { log } = console;
+
 const ourPackageJSON = await readPackage({ cwd: join(fileURLToPath(import.meta.url), '../../') });
 
 const DEFAULT_TEMPLATE = 'branch.short';
diff --git a/packages/version-from-git/src/tsconfig.custom.json b/packages/version-from-git/src/tsconfig.custom.json
new file mode 100644
index 0000000..7a3b017
--- /dev/null
+++ b/packages/version-from-git/src/tsconfig.custom.json
@@ -0,0 +1,3 @@
+{
+  "extends": "@tsconfig/strictest/tsconfig.json"
+}
diff --git a/packages/version-from-git/src/tsconfig.json b/packages/version-from-git/src/tsconfig.json
index aca1502..ae51fef 100644
--- a/packages/version-from-git/src/tsconfig.json
+++ b/packages/version-from-git/src/tsconfig.json
@@ -10,9 +10,8 @@
     "strict": true,
     "target": "ESNext",
     "types": [
-      "jest",
       "node"
     ]
   },
-  "extends": "@tsconfig/strictest/tsconfig.json"
+  "extends": "./tsconfig.custom.json"
 }
diff --git a/packages/version-from-git/src/tsconfig.precommit.production.json b/packages/version-from-git/src/tsconfig.precommit.production.json
index ed58ae3..68f3ff3 100644
--- a/packages/version-from-git/src/tsconfig.precommit.production.json
+++ b/packages/version-from-git/src/tsconfig.precommit.production.json
@@ -8,9 +8,7 @@
     "noEmit": true,
     "strict": true,
     "target": "ESNext",
-    "types": [
-      "node"
-    ]
+    "types": []
   },
   "exclude": [
     "**/*.spec.ts",
@@ -19,5 +17,5 @@
     "**/*.test.tsx",
     "__tests__/**/*"
   ],
-  "extends": "@tsconfig/strictest/tsconfig.json"
+  "extends": "./tsconfig.custom.json"
 }
diff --git a/packages/version-from-git/src/tsconfig.precommit.test.json b/packages/version-from-git/src/tsconfig.precommit.test.json
index edc7eb3..54576c2 100644
--- a/packages/version-from-git/src/tsconfig.precommit.test.json
+++ b/packages/version-from-git/src/tsconfig.precommit.test.json
@@ -8,7 +8,10 @@
     "noEmit": true,
     "strict": true,
     "target": "ESNext",
-    "types": ["jest", "node"]
+    "types": [
+      "jest",
+      "node"
+    ]
   },
   "extends": "@tsconfig/recommended/tsconfig.json",
   "include": [
diff --git a/packages/version-from-git/tsup.config.ts b/packages/version-from-git/tsup.config.ts
index e610e6b..81816a6 100644
--- a/packages/version-from-git/tsup.config.ts
+++ b/packages/version-from-git/tsup.config.ts
@@ -2,10 +2,11 @@ import { defineConfig } from 'tsup';
 
 export default defineConfig([
   {
+    dts: true,
     entry: {
-      'version-from-git': './src/index.mts'
+      'version-from-git': './src/index.ts'
     },
-    format: ['esm'],
+    format: 'esm',
     sourcemap: true
   }
 ]);