diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 60bc2ef..3f7bf67 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -178,7 +178,7 @@ jobs:
           cache: "npm"
       - run: ls -laR ./prebuilds
       - run: npm ci
-      - run: npm run tsc
+      - run: npm run prepare-release
 
       # readme: https://github.com/actions/checkout?tab=readme-ov-file#push-a-commit-using-the-built-in-token
       # https://chatgpt.com/share/6761e017-9950-800e-ba1e-94d575010f2d
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 09a17ee..5327e19 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -5,14 +5,14 @@ import ts_eslint from "typescript-eslint";
 /** @type {import('eslint').Linter.Config[]} */
 export default [
   {
-    files: ["src/**/*.ts", "scripts/*.js", "*.js"],
+    files: ["src/**/*.ts", "scripts/*.js"],
     languageOptions: {
       globals: {
         ...globals.node,
       },
     },
   },
-  { ignores: [".tsup", "build", "coverage", "dist*", "docs"] },
+  { ignores: ["build", "coverage", "dist", "docs", "*.cts", "*.cjs"] },
   pluginJs.configs.recommended,
   ...ts_eslint.configs.recommended,
   ...ts_eslint.configs.strict,
diff --git a/jest.config.cjs b/jest.config.cjs
new file mode 100644
index 0000000..999ecb3
--- /dev/null
+++ b/jest.config.cjs
@@ -0,0 +1,33 @@
+// @ts-check
+
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+
+const config = {
+  displayName: "@photostructure/fs-metadata (CJS)",
+  testEnvironment: "jest-environment-node",
+  roots: ["<rootDir>/src"],
+  coverageProvider: "v8",
+  moduleNameMapper: {
+    "^(\\.{1,2}/.*)\\.js$": "$1",
+  },
+  transform: {
+    "^.+\\.(c)?ts$": [
+      "ts-jest",
+      {
+        useESM: false,
+        tsconfig: "tsconfig.jest-cjs.json",
+      },
+    ],
+  },
+  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
+  collectCoverage: false,
+  verbose: true,
+  silent: false,
+  randomize: true,
+  setupFilesAfterEnv: [
+    "jest-extended/all",
+    "<rootDir>/src/test-utils/jest-matchers.ts",
+  ],
+};
+
+module.exports = config;
diff --git a/jest.config.mjs b/jest.config.mjs
index 66bf578..69424eb 100644
--- a/jest.config.mjs
+++ b/jest.config.mjs
@@ -7,8 +7,9 @@ const otherPlatforms = ["linux", "darwin", "windows"]
   .map((ea) => `/${ea}/`);
 
 /** @type {import('ts-jest').JestConfigWithTsJest} */
+
 const config = {
-  displayName: "@photostructure/fs-metadata",
+  displayName: "@photostructure/fs-metadata (ESM)",
   testEnvironment: "jest-environment-node",
   roots: ["<rootDir>/src"],
   coverageProvider: "v8",
@@ -16,15 +17,15 @@ const config = {
     "^(\\.{1,2}/.*)\\.js$": "$1",
   },
   transform: {
-    "^.+\\.tsx?$": [
+    "^.+\\.(m)?ts$": [
       "ts-jest",
       {
         useESM: true,
-        tsconfig: "tsconfig.json",
+        tsconfig: "tsconfig.jest-esm.json",
       },
     ],
   },
-  extensionsToTreatAsEsm: [".ts"],
+  extensionsToTreatAsEsm: [".ts", ".mts"],
   moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
   collectCoverage:
     argv.includes("--coverage") && !argv.includes("--no-coverage"),
@@ -33,7 +34,6 @@ const config = {
   collectCoverageFrom: ["src/**/*.ts"],
   coveragePathIgnorePatterns: [
     "debuglog",
-    "\\.test\\.ts$",
     "/test-utils/",
     "/types/",
     ...otherPlatforms,
diff --git a/package-lock.json b/package-lock.json
index b4309f7..ddb4236 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,6 +43,7 @@
         "release-it": "^17.10.0",
         "terser": "^5.37.0",
         "ts-jest": "^29.2.5",
+        "tsup": "^8.3.5",
         "typedoc": "^0.27.5",
         "typescript": "^5.7.2",
         "typescript-eslint": "^8.18.1"
@@ -581,6 +582,23 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@esbuild/win32-x64": {
+      "version": "0.24.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.24.2.tgz",
+      "integrity": "sha512-7VTgWzgMGvup6aSqDPLiW5zHaxYJGTO4OokMjIlrCtf+VpEL+cXKtCvg723iguPYI5oaUNdS+/V7OU2gvXVWEg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.1.tgz",
@@ -1444,6 +1462,185 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@microsoft/api-extractor": {
+      "version": "7.48.1",
+      "resolved": "https://registry.npmjs.org/@microsoft/api-extractor/-/api-extractor-7.48.1.tgz",
+      "integrity": "sha512-HN9Osa1WxqLM66RaqB5nPAadx+nTIQmY/XtkFdaJvusjG8Tus++QqZtD7KPZDSkhEMGHsYeSyeU8qUzCDUXPjg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "@microsoft/api-extractor-model": "7.30.1",
+        "@microsoft/tsdoc": "~0.15.1",
+        "@microsoft/tsdoc-config": "~0.17.1",
+        "@rushstack/node-core-library": "5.10.1",
+        "@rushstack/rig-package": "0.5.3",
+        "@rushstack/terminal": "0.14.4",
+        "@rushstack/ts-command-line": "4.23.2",
+        "lodash": "~4.17.15",
+        "minimatch": "~3.0.3",
+        "resolve": "~1.22.1",
+        "semver": "~7.5.4",
+        "source-map": "~0.6.1",
+        "typescript": "5.4.2"
+      },
+      "bin": {
+        "api-extractor": "bin/api-extractor"
+      }
+    },
+    "node_modules/@microsoft/api-extractor-model": {
+      "version": "7.30.1",
+      "resolved": "https://registry.npmjs.org/@microsoft/api-extractor-model/-/api-extractor-model-7.30.1.tgz",
+      "integrity": "sha512-CTS2PlASJHxVY8hqHORVb1HdECWOEMcMnM6/kDkPr0RZapAFSIHhg9D4jxuE8g+OWYHtPc10LCpmde5pylTRlA==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "@microsoft/tsdoc": "~0.15.1",
+        "@microsoft/tsdoc-config": "~0.17.1",
+        "@rushstack/node-core-library": "5.10.1"
+      }
+    },
+    "node_modules/@microsoft/api-extractor/node_modules/brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/@microsoft/api-extractor/node_modules/lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/@microsoft/api-extractor/node_modules/minimatch": {
+      "version": "3.0.8",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.8.tgz",
+      "integrity": "sha512-6FsRAQsxQ61mw+qP1ZzbL9Bc78x2p5OqNgNpnoAFLTrX8n5Kxph0CsnhmKKNXTWjXqU5L0pGPR7hYk+XWZr60Q==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/@microsoft/api-extractor/node_modules/semver": {
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "lru-cache": "^6.0.0"
+      },
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/@microsoft/api-extractor/node_modules/typescript": {
+      "version": "5.4.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.2.tgz",
+      "integrity": "sha512-+2/g0Fds1ERlP6JsakQQDXjZdZMM+rqpamFZJEKh4kwTIn3iDkgKtby0CeNd5ATNZ4Ry1ax15TMx0W2V+miizQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "optional": true,
+      "peer": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/@microsoft/api-extractor/node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true
+    },
+    "node_modules/@microsoft/tsdoc": {
+      "version": "0.15.1",
+      "resolved": "https://registry.npmjs.org/@microsoft/tsdoc/-/tsdoc-0.15.1.tgz",
+      "integrity": "sha512-4aErSrCR/On/e5G2hDP0wjooqDdauzEbIq8hIkIe5pXV0rtWJZvdCEKL0ykZxex+IxIwBp0eGeV48hQN07dXtw==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true
+    },
+    "node_modules/@microsoft/tsdoc-config": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/@microsoft/tsdoc-config/-/tsdoc-config-0.17.1.tgz",
+      "integrity": "sha512-UtjIFe0C6oYgTnad4q1QP4qXwLhe6tIpNTRStJ2RZEPIkqQPREAwE5spzVxsdn9UaEMUqhh0AqSx3X4nWAKXWw==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "@microsoft/tsdoc": "0.15.1",
+        "ajv": "~8.12.0",
+        "jju": "~1.4.0",
+        "resolve": "~1.22.2"
+      }
+    },
+    "node_modules/@microsoft/tsdoc-config/node_modules/ajv": {
+      "version": "8.12.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.12.0.tgz",
+      "integrity": "sha512-sRu1kpcO9yLtYxBKvqfTeh9KzZEwO3STyX1HT+4CaDzC6HpTGYhIhPIzj9XuKU7KYDwnaeh5hcOwjy1QuJzBPA==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "fast-deep-equal": "^3.1.1",
+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2",
+        "uri-js": "^4.2.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
+    "node_modules/@microsoft/tsdoc-config/node_modules/json-schema-traverse": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
+      "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -1742,6 +1939,263 @@
         "node": ">=12"
       }
     },
+    "node_modules/@rollup/rollup-win32-x64-msvc": {
+      "version": "4.29.0",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-msvc/-/rollup-win32-x64-msvc-4.29.0.tgz",
+      "integrity": "sha512-GsFvcTZ7Yj9k94Qm0qgav7pxmQ7lQDR9NjoelRaxeV1UF6JSDfanR/2tHZ8hS7Ps4KPIVf5AElYPRPmN/Q0ZkQ==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ]
+    },
+    "node_modules/@rushstack/node-core-library": {
+      "version": "5.10.1",
+      "resolved": "https://registry.npmjs.org/@rushstack/node-core-library/-/node-core-library-5.10.1.tgz",
+      "integrity": "sha512-BSb/KcyBHmUQwINrgtzo6jiH0HlGFmrUy33vO6unmceuVKTEyL2q+P0fQq2oB5hvXVWOEUhxB2QvlkZluvUEmg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "ajv": "~8.13.0",
+        "ajv-draft-04": "~1.0.0",
+        "ajv-formats": "~3.0.1",
+        "fs-extra": "~7.0.1",
+        "import-lazy": "~4.0.0",
+        "jju": "~1.4.0",
+        "resolve": "~1.22.1",
+        "semver": "~7.5.4"
+      },
+      "peerDependencies": {
+        "@types/node": "*"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/ajv": {
+      "version": "8.13.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.13.0.tgz",
+      "integrity": "sha512-PRA911Blj99jR5RMeTunVbNXMF6Lp4vZXnk5GQjcnUWUTsrXtekg/pnmFFI2u/I36Y/2bITGS30GZCXei6uNkA==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "fast-deep-equal": "^3.1.3",
+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2",
+        "uri-js": "^4.4.1"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/ajv-draft-04": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/ajv-draft-04/-/ajv-draft-04-1.0.0.tgz",
+      "integrity": "sha512-mv00Te6nmYbRp5DCwclxtt7yV/joXJPGS7nM+97GdxvuttCOfgI3K4U25zboyeX0O+myI8ERluxQe5wljMmVIw==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "peerDependencies": {
+        "ajv": "^8.5.0"
+      },
+      "peerDependenciesMeta": {
+        "ajv": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/fs-extra": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-7.0.1.tgz",
+      "integrity": "sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "graceful-fs": "^4.1.2",
+        "jsonfile": "^4.0.0",
+        "universalify": "^0.1.0"
+      },
+      "engines": {
+        "node": ">=6 <7 || >=8"
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/json-schema-traverse": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
+      "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/jsonfile": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
+      "integrity": "sha512-m6F1R3z8jjlf2imQHS2Qez5sjKWQzbuuhuJ/FKYFRZvPE3PuHcSMVZzfsLhGVOkfd20obL5SWEBew5ShlquNxg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "optionalDependencies": {
+        "graceful-fs": "^4.1.6"
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/semver": {
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "lru-cache": "^6.0.0"
+      },
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/universalify": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
+      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "peer": true,
+      "engines": {
+        "node": ">= 4.0.0"
+      }
+    },
+    "node_modules/@rushstack/node-core-library/node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true,
+      "license": "ISC",
+      "optional": true,
+      "peer": true
+    },
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@@ -8788,6 +9519,20 @@
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@@ -9102,6 +9847,18 @@
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@@ -9267,6 +10024,45 @@
         "url": "https://github.com/sponsors/isaacs"
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+      "license": "MIT",
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+        "npm": ">=8.0.0"
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+        "@rollup/rollup-android-arm64": "4.29.0",
+        "@rollup/rollup-darwin-arm64": "4.29.0",
+        "@rollup/rollup-darwin-x64": "4.29.0",
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+        "@rollup/rollup-linux-arm-gnueabihf": "4.29.0",
+        "@rollup/rollup-linux-arm-musleabihf": "4.29.0",
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+        "@rollup/rollup-linux-loongarch64-gnu": "4.29.0",
+        "@rollup/rollup-linux-powerpc64le-gnu": "4.29.0",
+        "@rollup/rollup-linux-riscv64-gnu": "4.29.0",
+        "@rollup/rollup-linux-s390x-gnu": "4.29.0",
+        "@rollup/rollup-linux-x64-gnu": "4.29.0",
+        "@rollup/rollup-linux-x64-musl": "4.29.0",
+        "@rollup/rollup-win32-arm64-msvc": "4.29.0",
+        "@rollup/rollup-win32-ia32-msvc": "4.29.0",
+        "@rollup/rollup-win32-x64-msvc": "4.29.0",
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@@ -9694,6 +10490,18 @@
         "safe-buffer": "~5.2.0"
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+      "license": "MIT",
+      "optional": true,
+      "peer": true,
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+        "commander": "^4.0.0",
+        "glob": "^10.3.10",
+        "lines-and-columns": "^1.1.6",
+        "mz": "^2.7.0",
+        "pirates": "^4.0.1",
+        "ts-interface-checker": "^0.1.9"
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+        "sucrase": "bin/sucrase",
+        "sucrase-node": "bin/sucrase-node"
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+      "engines": {
+        "node": ">=16 || 14 >=14.17"
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/sucrase/node_modules/glob": {
+      "version": "10.4.5",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-10.4.5.tgz",
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+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "foreground-child": "^3.1.0",
+        "jackspeak": "^3.1.2",
+        "minimatch": "^9.0.4",
+        "minipass": "^7.1.2",
+        "package-json-from-dist": "^1.0.0",
+        "path-scurry": "^1.11.1"
+      },
+      "bin": {
+        "glob": "dist/esm/bin.mjs"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -10036,6 +10898,78 @@
         "node": "*"
       }
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+    "node_modules/thenify": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "any-promise": "^1.0.0"
+      }
+    },
+    "node_modules/thenify-all": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz",
+      "integrity": "sha512-RNxQH/qI8/t3thXJDwcstUO4zeqo64+Uy/+sNVRBx4Xn2OX+OZ9oP+iJnNFqplFra2ZUVeKCSa2oVWi3T4uVmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "thenify": ">= 3.1.0 < 4"
+      },
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/tinyexec": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-0.3.1.tgz",
+      "integrity": "sha512-WiCJLEECkO18gwqIp6+hJg0//p23HXp4S+gGtAKu3mI2F2/sXC4FvHvXvB0zJVVaTPhx1/tOwdbRsa1sOBIKqQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tinyglobby": {
+      "version": "0.2.10",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.10.tgz",
+      "integrity": "sha512-Zc+8eJlFMvgatPZTl6A9L/yht8QqdmUNtURHaKZLmKBE12hNPSrqNkUp2cs3M/UKmNVVAMFQYSjYIVHDjW5zew==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fdir": "^6.4.2",
+        "picomatch": "^4.0.2"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
+    "node_modules/tinyglobby/node_modules/fdir": {
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.4.2.tgz",
+      "integrity": "sha512-KnhMXsKSPZlAhp7+IjUkRZKPb4fUyccpDrdFXbi4QL1qkmFh9kVY09Yox+n4MaOb3lHZ1Tv829C3oaaXoMYPDQ==",
+      "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "picomatch": "^3 || ^4"
+      },
+      "peerDependenciesMeta": {
+        "picomatch": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/tinyglobby/node_modules/picomatch": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.2.tgz",
+      "integrity": "sha512-M7BAV6Rlcy5u+m6oPhAPFgJTzAioX/6B0DxyvDlo9l8+T3nLKbrczg2WLUyzd45L8RqfUMyGPzekbMvX2Ldkwg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
     "node_modules/tmp": {
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       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
@@ -10069,6 +11003,26 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/tr46": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-1.0.1.tgz",
+      "integrity": "sha512-dTpowEjclQ7Kgx5SdBkqRzVhERQXov8/l9Ft9dVM9fmg0W0KQSVaXX9T4i6twCPNtYiZM53lpSSUAwJbFPOHxA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
+    "node_modules/tree-kill": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/tree-kill/-/tree-kill-1.2.2.tgz",
+      "integrity": "sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "tree-kill": "cli.js"
+      }
+    },
     "node_modules/ts-api-utils": {
       "version": "1.4.2",
       "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-1.4.2.tgz",
@@ -10082,6 +11036,13 @@
         "typescript": ">=4.2.0"
       }
     },
+    "node_modules/ts-interface-checker": {
+      "version": "0.1.13",
+      "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
+      "integrity": "sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
     "node_modules/ts-jest": {
       "version": "29.2.5",
       "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.2.5.tgz",
@@ -10138,6 +11099,81 @@
       "dev": true,
       "license": "0BSD"
     },
+    "node_modules/tsup": {
+      "version": "8.3.5",
+      "resolved": "https://registry.npmjs.org/tsup/-/tsup-8.3.5.tgz",
+      "integrity": "sha512-Tunf6r6m6tnZsG9GYWndg0z8dEV7fD733VBFzFJ5Vcm1FtlXB8xBD/rtrBi2a3YKEV7hHtxiZtW5EAVADoe1pA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bundle-require": "^5.0.0",
+        "cac": "^6.7.14",
+        "chokidar": "^4.0.1",
+        "consola": "^3.2.3",
+        "debug": "^4.3.7",
+        "esbuild": "^0.24.0",
+        "joycon": "^3.1.1",
+        "picocolors": "^1.1.1",
+        "postcss-load-config": "^6.0.1",
+        "resolve-from": "^5.0.0",
+        "rollup": "^4.24.0",
+        "source-map": "0.8.0-beta.0",
+        "sucrase": "^3.35.0",
+        "tinyexec": "^0.3.1",
+        "tinyglobby": "^0.2.9",
+        "tree-kill": "^1.2.2"
+      },
+      "bin": {
+        "tsup": "dist/cli-default.js",
+        "tsup-node": "dist/cli-node.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@microsoft/api-extractor": "^7.36.0",
+        "@swc/core": "^1",
+        "postcss": "^8.4.12",
+        "typescript": ">=4.5.0"
+      },
+      "peerDependenciesMeta": {
+        "@microsoft/api-extractor": {
+          "optional": true
+        },
+        "@swc/core": {
+          "optional": true
+        },
+        "postcss": {
+          "optional": true
+        },
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/tsup/node_modules/resolve-from": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
+      "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/tsup/node_modules/source-map": {
+      "version": "0.8.0-beta.0",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.8.0-beta.0.tgz",
+      "integrity": "sha512-2ymg6oRBpebeZi9UUNsgQ89bhx01TcTkmNTGnNO88imTmbSgy4nfujrgVEFKWpMTEGA11EDkTt7mqObTPdigIA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "whatwg-url": "^7.0.0"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -10540,6 +11576,25 @@
         "defaults": "^1.0.3"
       }
     },
+    "node_modules/webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true,
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/whatwg-url": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.1.0.tgz",
+      "integrity": "sha512-WUu7Rg1DroM7oQvGWfOiAK21n74Gg+T4elXEQYkOhtyLeWiJFoOGLXPKI/9gzIie9CtwVLm8wtw6YJdKyxSjeg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
     "node_modules/when-exit": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/when-exit/-/when-exit-2.1.3.tgz",
diff --git a/package.json b/package.json
index b364fe8..55c15cc 100644
--- a/package.json
+++ b/package.json
@@ -3,18 +3,9 @@
   "version": "0.1.4",
   "description": "Cross-platform native filesystem metadata retrieval for Node.js",
   "homepage": "https://photostructure.github.io/fs-metadata/",
-  "// exports": "https://nodejs.org/api/packages.html#conditional-exports",
   "types": "./dist/types/index.d.ts",
-  "main": "./dist/cjs/index.cjs",
-  "module": "./dist/esm/index.js",
-  "exports": {
-    ".": {
-      "types": "./dist/types/index.d.ts",
-      "require": "./dist/cjs/index.cjs",
-      "import": "./dist/esm/index.js",
-      "default": "./dist/esm/index.js"
-    }
-  },
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.mjs",
   "repository": {
     "type": "git",
     "url": "git+ssh://git@github.com/photostructure/fs-metadata.git"
@@ -27,28 +18,32 @@
     "clean:gyp-cache": "del-cli build %USERPROFILE%/.node-gyp ~/.node-gyp",
     "clean:gyp": "node-gyp clean",
     "node-gyp-rebuild": "node-gyp rebuild",
-    "// scripts/configure.js checks if gio is installed": "",
     "configure": "node scripts/configure.mjs",
     "prebuildify": "prebuildify --napi --tag-libc --strip",
-    "// prebuild": "is called by .github/workflows/build.yml",
     "prebuild": "run-s configure prebuildify",
     "prep": "run-s clean prebuild tsc",
     "tsc": "run-p tsc:*",
-    "tsc:esm": "tsc -p tsconfig.esm.json",
+    "tsc:esm": "tsc -p tsconfig.esm.json --noEmit",
+    "tsc:cjs": "tsc -p tsconfig.cjs.json --noEmit",
     "tsc:types": "tsc -p tsconfig.types.json",
-    "tsc:cjs": "tsc -p tsconfig.cjs.json",
-    "posttsc:cjs": "node scripts/fix-cjs.mjs",
-    "tsc:tests": "tsc -p tsconfig.json",
-    "watch": "tsc --watch --project tsconfig.watch.json",
+    "posttsc:types": "mv dist/types/index.d.mts dist/types/index.d.ts",
+    "watch": "tsc --watch",
+    "pretsup": "run-s clean:dist",
+    "tsup": "run-p tsup:* tsc:types",
+    "tsup:cjs": "tsup src/index.cts --format cjs --tsconfig tsconfig.cjs.json",
+    "tsup:esm": "tsup src/index.mts --format esm --tsconfig tsconfig.esm.json",
     "docs": "typedoc --out docs src/index.ts",
     "jest:coverage": "jest --coverage",
     "jest:watch": "npm t -- --watch",
     "jest:clear": "jest --clearCache",
-    "// tests": "is called by .github/workflows/test.yml",
-    "tests": "run-s lint test test:memory",
-    "test": "node --experimental-vm-modules --no-warnings node_modules/jest/bin/jest.js --coverage",
+    "tests": "run-s lint test:*",
+    "test": "npm run test:cjs",
+    "pretest:cjs": "npm run tsup:cjs",
+    "test:cjs": "jest --config jest.config.cjs",
+    "pretest:esm": "npm run tsup:esm",
+    "test:esm": "node --experimental-vm-modules --no-warnings node_modules/jest/bin/jest.js --config jest.config.mjs",
     "// test:memory:todo": "set up valgrind or similar",
-    "test:memory": "cross-env TEST_MEMORY=1 node --expose-gc --experimental-vm-modules --no-warnings node_modules/jest/bin/jest.js --no-coverage src/memory.test.ts",
+    "test:memory": "cross-env TEST_MEMORY=1 node --expose-gc --experimental-vm-modules --no-warnings node_modules/jest/bin/jest.js --config jest.config.mjs --no-coverage src/memory.test.ts",
     "lint": "eslint",
     "lint:fix": "eslint --fix",
     "fmt": "run-p fmt:*",
@@ -57,11 +52,9 @@
     "fmt:js": "prettier --write \"scripts/**/*.?js\" \"*.?js\"",
     "fmt:json": "prettier --write \"**/*.json\"",
     "fmt:pkg": "npm pkg fix",
-    "fmt:ts": "prettier --write \"src/**/*.ts\"",
-    "// precommit": "is called manually before committing",
+    "fmt:ts": "prettier --write \"**/*.(c|m)?ts\"",
     "precommit": "run-s fmt prep tests",
-    "// release": "is called by .github/workflows/release.yml and should only be run via GitHub Actions",
-    "prerelease": "tsc",
+    "prepare-release": "tsup",
     "release": "release-it"
   },
   "gypfile": true,
@@ -104,19 +97,20 @@
     "del-cli": "^6.0.0",
     "eslint": "^9.17.0",
     "globals": "^15.14.0",
-    "jest": "^29.7.0",
     "jest-environment-node": "^29.7.0",
     "jest-extended": "^4.0.2",
+    "jest": "^29.7.0",
     "node-gyp": "^11.0.0",
     "npm-run-all": "4.1.5",
     "prebuildify": "^6.0.1",
-    "prettier": "^3.4.2",
     "prettier-plugin-organize-imports": "4.1.0",
+    "prettier": "^3.4.2",
     "release-it": "^17.10.0",
     "terser": "^5.37.0",
     "ts-jest": "^29.2.5",
+    "tsup": "^8.3.5",
     "typedoc": "^0.27.5",
-    "typescript": "^5.7.2",
-    "typescript-eslint": "^8.18.1"
+    "typescript-eslint": "^8.18.1",
+    "typescript": "^5.7.2"
   }
 }
diff --git a/scripts/fix-cjs.mjs b/scripts/fix-cjs.mjs
deleted file mode 100644
index 4d62c5b..0000000
--- a/scripts/fix-cjs.mjs
+++ /dev/null
@@ -1,35 +0,0 @@
-import { readFile, readdir, unlink, writeFile } from "node:fs/promises";
-import { join } from "node:path";
-
-async function fixCjsFiles(dir) {
-  const files = await readdir(dir, { withFileTypes: true });
-
-  for (const file of files) {
-    const fullPath = join(dir, file.name);
-
-    if (file.isDirectory()) {
-      await fixCjsFiles(fullPath);
-      continue;
-    }
-
-    // First read and fix content
-    if (file.name.endsWith(".js") || file.name.endsWith(".cjs")) {
-      const content = await readFile(fullPath, "utf8");
-      const fixedContent = content.replace(
-        /require\("(.+?)\.js"\)/gm,
-        'require("$1.cjs")',
-      );
-
-      // Write fixed content to .cjs file
-      const newPath = fullPath.replace(/\.js$/, ".cjs");
-      await writeFile(newPath, fixedContent);
-
-      // Remove old .js file if it exists
-      if (newPath !== fullPath) {
-        await unlink(fullPath);
-      }
-    }
-  }
-}
-
-await fixCjsFiles("./dist/cjs");
diff --git a/src/hidden.test.ts b/src/hidden.test.ts
index 5583362..d8ff35e 100644
--- a/src/hidden.test.ts
+++ b/src/hidden.test.ts
@@ -4,14 +4,9 @@ import { execSync } from "node:child_process";
 import fs from "node:fs/promises";
 import { homedir } from "node:os";
 import path, { join } from "node:path";
+import { getHiddenMetadata, isHidden, isHiddenRecursive, setHidden } from "..";
 import { statAsync } from "./fs.js";
 import { createHiddenPosixPath, LocalSupport } from "./hidden.js";
-import {
-  getHiddenMetadata,
-  isHidden,
-  isHiddenRecursive,
-  setHidden,
-} from "./index.js";
 import { isLinux, isMacOS, isWindows } from "./platform.js";
 import { validateHidden } from "./test-utils/hidden-tests.js";
 import { systemDrive, tmpDirNotHidden } from "./test-utils/platform.js";
diff --git a/src/index.ts b/src/index.mts
similarity index 100%
rename from src/index.ts
rename to src/index.mts
diff --git a/src/memory.test.ts b/src/memory.test.ts
index b959464..4674919 100644
--- a/src/memory.test.ts
+++ b/src/memory.test.ts
@@ -4,14 +4,14 @@ import { jest } from "@jest/globals";
 import { mkdtemp, rm } from "fs/promises";
 import { tmpdir } from "os";
 import { join } from "path";
-import { delay } from "./async.js";
 import {
   getAllVolumeMetadata,
   getVolumeMetadata,
   getVolumeMountPoints,
   isHidden,
   setHidden,
-} from "./index.js";
+} from "..";
+import { delay } from "./async.js";
 import { randomLetters } from "./random.js";
 import { validateHidden } from "./test-utils/hidden-tests.js";
 import { tmpDirNotHidden } from "./test-utils/platform.js";
diff --git a/src/mount_point.test.ts b/src/mount_point.test.ts
index 305b0af..bc453d0 100644
--- a/src/mount_point.test.ts
+++ b/src/mount_point.test.ts
@@ -1,9 +1,9 @@
 // src/mount_point.test.ts
 
 import { jest } from "@jest/globals";
+import { getVolumeMountPoints } from "..";
 import { times, uniq } from "./array.js";
 import { TimeoutError } from "./async.js";
-import { getVolumeMountPoints } from "./index.js";
 import { MountPoint } from "./mount_point.js";
 import { isLinux, isWindows } from "./platform.js";
 import { sortByLocale } from "./string.js";
diff --git a/src/test-utils/hidden-tests.ts b/src/test-utils/hidden-tests.ts
index 3e7e6ca..ef2f69f 100644
--- a/src/test-utils/hidden-tests.ts
+++ b/src/test-utils/hidden-tests.ts
@@ -1,6 +1,6 @@
 import { mkdir, writeFile } from "node:fs/promises";
 import { join } from "node:path";
-import { isHidden, isHiddenRecursive, setHidden } from "../index.js";
+import { isHidden, isHiddenRecursive, setHidden } from "../..";
 
 /**
  * This function exercises the hidden file functionality and is used by both
diff --git a/src/volume_metadata.test.ts b/src/volume_metadata.test.ts
index d686eaf..ac2375a 100644
--- a/src/volume_metadata.test.ts
+++ b/src/volume_metadata.test.ts
@@ -2,14 +2,13 @@
 
 import { jest } from "@jest/globals";
 import { join } from "node:path";
-import { compact, times } from "./array.js";
-import { TimeoutError } from "./async.js";
 import {
   getAllVolumeMetadata,
   getVolumeMetadata,
   getVolumeMountPoints,
   VolumeHealthStatuses,
-} from "./index.js";
+} from "..";
+import { compact, times } from "./array.js";
 import { omit } from "./object.js";
 import { IncludeSystemVolumesDefault } from "./options.js";
 import { isLinux, isMacOS, isWindows } from "./platform.js";
@@ -92,7 +91,7 @@ describe("concurrent", () => {
         } catch (error) {
           if (timeoutMs === 1) {
             console.log("Expected timeout", { mountPoint, timeoutMs, error });
-            expect(error).toBeInstanceOf(TimeoutError);
+            expect(String(error)).toMatch(/TimeoutError/); // < we can't check for instanceOf TimeoutError because it's imported from the tsup bundle
             return;
           } else if (!validMountPoints.includes(mountPoint)) {
             console.log("Expected bad mount point", {
diff --git a/tsconfig.cjs.json b/tsconfig.cjs.json
index 8a729b2..c1b5ea6 100644
--- a/tsconfig.cjs.json
+++ b/tsconfig.cjs.json
@@ -2,9 +2,8 @@
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
     "module": "CommonJS",
-    "outDir": "./dist/cjs",
-    "moduleResolution": "node"
+    "moduleResolution": "node",
+    "outDir": "./dist/cjs"
   },
-  "files": ["src/index.cts"],
-  "exclude": ["src/index.ts", "node_modules", "**/test-utils/*", "**/*.test.ts"]
+  "files": ["src/index.cts"]
 }
diff --git a/tsconfig.esm.json b/tsconfig.esm.json
index eb10b73..50b47b6 100644
--- a/tsconfig.esm.json
+++ b/tsconfig.esm.json
@@ -2,8 +2,8 @@
   "extends": "./tsconfig.base.json",
   "compilerOptions": {
     "module": "node16",
-    "outDir": "./dist/esm",
-    "moduleResolution": "node16"
+    "moduleResolution": "node16",
+    "outDir": "./dist/esm"
   },
-  "files": ["src/index.ts"]
+  "files": ["src/index.mts"]
 }
diff --git a/tsconfig.jest-base.json b/tsconfig.jest-base.json
new file mode 100644
index 0000000..d38bd62
--- /dev/null
+++ b/tsconfig.jest-base.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "noEmit": true,
+    "types": ["node", "jest"]
+  },
+  "files": [
+    "node_modules/jest-extended/types/index.d.ts",
+    "src/types/jest-extended.d.ts"
+  ],
+  "include": ["src/**/*.ts"],
+  "exclude": ["node_modules"]
+}
diff --git a/tsconfig.jest-cjs.json b/tsconfig.jest-cjs.json
new file mode 100644
index 0000000..789d138
--- /dev/null
+++ b/tsconfig.jest-cjs.json
@@ -0,0 +1,3 @@
+{
+  "extends": ["./tsconfig.cjs.json", "./tsconfig.jest-base.json"]
+}
diff --git a/tsconfig.jest-esm.json b/tsconfig.jest-esm.json
new file mode 100644
index 0000000..e576f15
--- /dev/null
+++ b/tsconfig.jest-esm.json
@@ -0,0 +1,3 @@
+{
+  "extends": ["./tsconfig.esm.json", "./tsconfig.jest-base.json"]
+}
diff --git a/tsconfig.json b/tsconfig.json
index 1c92296..e2d04fd 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,13 +1,8 @@
 {
-  "extends": "./tsconfig.esm.json",
+  "#": "used by `npm run watch` and vscode",
+  "extends": "./tsconfig.jest-esm.json",
   "compilerOptions": {
-    "types": ["node", "jest"],
-    "noEmit": true,
-    "sourceMap": true,
-    "inlineSources": true,
-    "inlineSourceMap": false,
-    "esModuleInterop": true
-  },
-  "exclude": ["node_modules"],
-  "files": ["node_modules/jest-extended/types/index.d.ts"]
+    "noEmit": false,
+    "sourceMap": true
+  }
 }
diff --git a/tsconfig.types.json b/tsconfig.types.json
index 3dc6c3b..27b22d3 100644
--- a/tsconfig.types.json
+++ b/tsconfig.types.json
@@ -1,8 +1,10 @@
 {
   "extends": "./tsconfig.esm.json",
   "compilerOptions": {
+    "emitDeclarationOnly": true,
     "declaration": true,
-    "declarationMap": true,
+    "declarationMap": false,
+    "sourceMap": false,
     "outDir": "./dist/types"
   }
 }
diff --git a/tsconfig.watch.json b/tsconfig.watch.json
deleted file mode 100644
index cc5774c..0000000
--- a/tsconfig.watch.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "noEmit": false
-  }
-}
diff --git a/tsup.config.ts b/tsup.config.ts
new file mode 100644
index 0000000..c278a23
--- /dev/null
+++ b/tsup.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from "tsup";
+
+export default defineConfig({
+  outExtension: ({ format }) => ({
+    js: format === "cjs" ? ".cjs" : ".mjs", // Use .cjs for CommonJS and .mjs for ESM
+  }),
+});