diff --git a/.github/workflows/typecheck.yml b/.github/workflows/typecheck.yml
new file mode 100644
index 0000000..141834b
--- /dev/null
+++ b/.github/workflows/typecheck.yml
@@ -0,0 +1,28 @@
+on:
+  pull_request:
+    branches:
+      - '*'
+
+name: Typecheck
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [14.x]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Restore dependencies
+        id: cache-modules
+        uses: actions/checkout@v2
+        with:
+          path: node_modules
+          key: ${{ matrix.node-version }}-${{ runner.OS }}-build-${{ hashFiles('package.json') }}
+      - name: Install dependencies
+        run: npm install
+      - name: Typecheck
+        uses: gozala/typescript-error-reporter-action@v1.0.8
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7fd6b89
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+node_modules
+npm-debug.*
+*.tsbuildinfo
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..b29cf66
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,4 @@
+language: node_js
+node_js:
+  - "4"
+  - "6"
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..c5e512c
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,16 @@
+interface Err<Code> extends Error {
+  code: Code
+}
+
+interface CreateError {
+  <Code extends string|number, Ext extends Object> (
+    error:Error,
+    code: Code,
+    ext: Ext
+  ): Err<Code> & Ext
+  <Code extends string|number> (error:Error, code:Code): Err<Code>
+  <Ext extends Object> (error:Error, ext:Ext): Err<undefined> & Ext
+}
+
+declare var createError:CreateError
+export = createError
diff --git a/package-lock.json b/package-lock.json
index 31be727..5b8224f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,58 +1,25 @@
 {
   "name": "err-code",
-  "version": "2.0.3",
+  "version": "3.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "@babel/code-frame": {
-      "version": "7.10.1",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.1.tgz",
-      "integrity": "sha512-IGhtTmpjGbYzcEDOw7DcQtbQSXcG9ftmAXtWTu9V936vDye4xjjekktFAtgZsWpzTj/X01jocB46mTywm/4SZw==",
-      "dev": true,
-      "requires": {
-        "@babel/highlight": "^7.10.1"
-      }
-    },
-    "@babel/helper-validator-identifier": {
-      "version": "7.10.1",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.1.tgz",
-      "integrity": "sha512-5vW/JXLALhczRCWP0PnFDMCJAchlBvM7f4uk/jXritBnIa6E1KmqmtrS3yn1LAnxFBypQ3eneLuXjsnfQsgILw==",
-      "dev": true
-    },
-    "@babel/highlight": {
-      "version": "7.10.1",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.1.tgz",
-      "integrity": "sha512-8rMof+gVP8mxYZApLF/JgNDAkdKa+aJt3ZYxF8z6+j/hpeXL7iMsKCPHa2jNMHu/qqBwzQF4OHNoYi8dMA/rYg==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-validator-identifier": "^7.10.1",
-        "chalk": "^2.0.0",
-        "js-tokens": "^4.0.0"
-      },
-      "dependencies": {
-        "chalk": {
-          "version": "2.4.2",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^3.2.1",
-            "escape-string-regexp": "^1.0.5",
-            "supports-color": "^5.3.0"
-          }
-        }
-      }
-    },
     "@satazor/eslint-config": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/@satazor/eslint-config/-/eslint-config-3.2.0.tgz",
       "integrity": "sha1-MVqnEqh9BoowUeuaj17W9ATt3EM=",
       "dev": true
     },
-    "@types/color-name": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
-      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+    "@types/expect.js": {
+      "version": "0.3.29",
+      "resolved": "https://registry.npmjs.org/@types/expect.js/-/expect.js-0.3.29.tgz",
+      "integrity": "sha1-KN01kVW4S47LCUr8P0t0wyItyjs=",
+      "dev": true
+    },
+    "@types/mocha": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-8.2.0.tgz",
+      "integrity": "sha512-/Sge3BymXo4lKc31C8OINJgXLaw+7vL1/L1pGiBNpGrBiT8FQiaFpSYV0uhTaG4y78vcMBTMFsWaHDvuD+xGzQ==",
       "dev": true
     },
     "JSONStream": {
@@ -66,16 +33,27 @@
       }
     },
     "acorn": {
-      "version": "7.3.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.3.1.tgz",
-      "integrity": "sha512-tLc0wSnatxAQHVHUapaHdz72pi9KUyHjq5KyHjGg9Y8Ifdc79pTh2XvI6I1/chZbnM7QtNKzh66ooDogPZSleA==",
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
+      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
       "dev": true
     },
     "acorn-jsx": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
-      "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
-      "dev": true
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
+        "acorn": "^3.0.4"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
     },
     "acorn-node": {
       "version": "1.8.2",
@@ -95,64 +73,49 @@
       "dev": true
     },
     "ajv": {
-      "version": "6.12.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.2.tgz",
-      "integrity": "sha512-k+V+hzjm5q/Mr8ef/1Y9goCmlsK4I6Sm74teeyGvFk1XrOsbsKLjEdrvny42CZ+a8sXbk8KWpY/bDwS+FLL2UQ==",
+      "version": "4.11.8",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
+      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
       "dev": true,
       "requires": {
-        "fast-deep-equal": "^3.1.1",
-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.4.1",
-        "uri-js": "^4.2.2"
+        "co": "^4.6.0",
+        "json-stable-stringify": "^1.0.1"
+      },
+      "dependencies": {
+        "json-stable-stringify": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
+          "integrity": "sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=",
+          "dev": true,
+          "requires": {
+            "jsonify": "~0.0.0"
+          }
+        }
       }
     },
-    "ansi-colors": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
-      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+    "ajv-keywords": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
+      "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
       "dev": true
     },
     "ansi-escapes": {
-      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
-      "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
-      "dev": true,
-      "requires": {
-        "type-fest": "^0.11.0"
-      },
-      "dependencies": {
-        "type-fest": {
-          "version": "0.11.0",
-          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
-          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
-          "dev": true
-        }
-      }
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
+      "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
+      "dev": true
     },
     "ansi-regex": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
-      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
       "dev": true
     },
     "ansi-styles": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-      "dev": true,
-      "requires": {
-        "color-convert": "^1.9.0"
-      }
-    },
-    "anymatch": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
-      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
-      "dev": true,
-      "requires": {
-        "normalize-path": "^3.0.0",
-        "picomatch": "^2.0.4"
-      }
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
     },
     "argparse": {
       "version": "1.0.10",
@@ -163,27 +126,16 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "array.prototype.map": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/array.prototype.map/-/array.prototype.map-1.0.2.tgz",
-      "integrity": "sha512-Az3OYxgsa1g7xDYp86l0nnN4bcmuEITGe1rbdEBVkrqkzMgDcbdQ2R7r41pNzti+4NMces3H8gMmuioZUilLgw==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.0-next.1",
-        "es-array-method-boxes-properly": "^1.0.0",
-        "is-string": "^1.0.4"
-      }
-    },
     "asn1.js": {
-      "version": "4.10.1",
-      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
-      "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
       "dev": true,
       "requires": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0"
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
       },
       "dependencies": {
         "bn.js": {
@@ -221,11 +173,16 @@
         }
       }
     },
-    "astral-regex": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
-      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
-      "dev": true
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
+      }
     },
     "balanced-match": {
       "version": "1.0.0",
@@ -234,21 +191,15 @@
       "dev": true
     },
     "base64-js": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.1.tgz",
-      "integrity": "sha512-mLQ4i2QO1ytvGWFWmcngKO//JXAQueZvwEKtjgQFM4jIK0kU+ytMfplL8j+n5mspOfjHwoAg+9yhb7BwAHm36g==",
-      "dev": true
-    },
-    "binary-extensions": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
-      "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
       "dev": true
     },
     "bn.js": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.2.tgz",
-      "integrity": "sha512-40rZaf3bUNKTVYu9sIeeEGOg7g14Yvnj9kH7b50EiwX0Q7A6umbvfI5tvHaOERH0XigqKkfLkFQxzb4e6CIXnA==",
+      "version": "5.1.3",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.3.tgz",
+      "integrity": "sha512-GkTiFpjFtUzU9CbMeJ5iazkCzGL3jrhzerzZIuqLABjbwRaFt33I9tUdSNryIptM+RxDet6OKm2WnLXzW51KsQ==",
       "dev": true
     },
     "brace-expansion": {
@@ -261,15 +212,6 @@
         "concat-map": "0.0.1"
       }
     },
-    "braces": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
-      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
-      "dev": true,
-      "requires": {
-        "fill-range": "^7.0.1"
-      }
-    },
     "brorand": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
@@ -308,15 +250,15 @@
       }
     },
     "browser-stdout": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
-      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
       "dev": true
     },
     "browserify": {
-      "version": "16.5.1",
-      "resolved": "https://registry.npmjs.org/browserify/-/browserify-16.5.1.tgz",
-      "integrity": "sha512-EQX0h59Pp+0GtSRb5rL6OTfrttlzv+uyaUVlK6GX3w11SQ0jKPKyjC/54RhPR2ib2KmfcELM06e8FxcI5XNU2A==",
+      "version": "14.5.0",
+      "resolved": "https://registry.npmjs.org/browserify/-/browserify-14.5.0.tgz",
+      "integrity": "sha512-gKfOsNQv/toWz+60nSPfYzuwSEdzvV2WdxrVPUbPD/qui44rAkB3t3muNtmmGYHqrG56FGwX9SUEQmzNLAeS7g==",
       "dev": true,
       "requires": {
         "JSONStream": "^1.0.3",
@@ -324,17 +266,17 @@
         "browser-pack": "^6.0.1",
         "browser-resolve": "^1.11.0",
         "browserify-zlib": "~0.2.0",
-        "buffer": "~5.2.1",
+        "buffer": "^5.0.2",
         "cached-path-relative": "^1.0.0",
-        "concat-stream": "^1.6.0",
+        "concat-stream": "~1.5.1",
         "console-browserify": "^1.1.0",
         "constants-browserify": "~1.0.0",
         "crypto-browserify": "^3.0.0",
         "defined": "^1.0.0",
         "deps-sort": "^2.0.0",
-        "domain-browser": "^1.2.0",
+        "domain-browser": "~1.1.0",
         "duplexer2": "~0.1.2",
-        "events": "^2.0.0",
+        "events": "~1.1.0",
         "glob": "^7.1.0",
         "has": "^1.0.0",
         "htmlescape": "^1.1.0",
@@ -342,8 +284,7 @@
         "inherits": "~2.0.1",
         "insert-module-globals": "^7.0.0",
         "labeled-stream-splicer": "^2.0.0",
-        "mkdirp-classic": "^0.5.2",
-        "module-deps": "^6.0.0",
+        "module-deps": "^4.0.8",
         "os-browserify": "~0.3.0",
         "parents": "^1.0.1",
         "path-browserify": "~0.0.0",
@@ -356,16 +297,16 @@
         "shasum": "^1.0.0",
         "shell-quote": "^1.6.1",
         "stream-browserify": "^2.0.0",
-        "stream-http": "^3.0.0",
-        "string_decoder": "^1.1.1",
+        "stream-http": "^2.0.0",
+        "string_decoder": "~1.0.0",
         "subarg": "^1.0.0",
         "syntax-error": "^1.1.1",
         "through2": "^2.0.0",
         "timers-browserify": "^1.0.1",
-        "tty-browserify": "0.0.1",
+        "tty-browserify": "~0.0.0",
         "url": "~0.11.0",
         "util": "~0.10.1",
-        "vm-browserify": "^1.0.0",
+        "vm-browserify": "~0.0.1",
         "xtend": "^4.0.0"
       }
     },
@@ -407,34 +348,26 @@
       }
     },
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-      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
@@ -3057,125 +2569,6 @@
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
       "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
       "dev": true
-    },
-    "y18n": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-      "dev": true
-    },
-    "yargs": {
-      "version": "13.3.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
-      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
-      "dev": true,
-      "requires": {
-        "cliui": "^5.0.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^2.0.1",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
-        "string-width": "^3.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.2"
-      },
-      "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
-        "emoji-regex": {
-          "version": "7.0.3",
-          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
-          "dev": true
-        },
-        "find-up": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
-          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
-          "dev": true,
-          "requires": {
-            "locate-path": "^3.0.0"
-          }
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-        "is-fullwidth-code-point": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
-          "dev": true
-        },
-        "locate-path": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
-          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
-          "dev": true,
-          "requires": {
-            "p-locate": "^3.0.0",
-            "path-exists": "^3.0.0"
-          }
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-        "p-locate": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
-          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
-          "dev": true,
-          "requires": {
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-          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
-          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
-          "dev": true
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-        "string-width": {
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-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
-          "dev": true,
-          "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
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-      }
-    },
-    "yargs-parser": {
-      "version": "13.1.2",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
-      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
-      "dev": true,
-      "requires": {
-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
-      }
-    },
-    "yargs-unparser": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
-      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
-      "dev": true,
-      "requires": {
-        "flat": "^4.1.0",
-        "lodash": "^4.17.15",
-        "yargs": "^13.3.0"
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index 8c6007b..5089e0b 100644
--- a/package.json
+++ b/package.json
@@ -1,10 +1,12 @@
 {
   "name": "err-code",
-  "version": "2.0.3",
+  "version": "3.0.0",
   "description": "Create an error with a code",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
     "lint": "eslint '{*.js,test/**/*.js}' --ignore-pattern *.umd.js",
+    "check": "tsc --build",
     "test": "mocha --bail",
     "browserify": "browserify -s err-code index.js > index.umd.js"
   },
@@ -26,9 +28,12 @@
   "license": "MIT",
   "devDependencies": {
     "@satazor/eslint-config": "^3.0.0",
-    "browserify": "^16.5.1",
-    "eslint": "^7.2.0",
+    "@types/expect.js": "0.3.29",
+    "@types/mocha": "8.2.0",
+    "browserify": "^14.0.0",
+    "eslint": "^3.0.0",
     "expect.js": "^0.3.1",
-    "mocha": "^8.0.1"
+    "mocha": "^3.0.2",
+    "typescript": "^4.1.3"
   }
 }
diff --git a/test/test.js b/test/test.js
index 22ba0a8..b8c2aca 100644
--- a/test/test.js
+++ b/test/test.js
@@ -6,6 +6,7 @@ const expect = require('expect.js');
 describe('errcode', () => {
     describe('string as first argument', () => {
         it('should throw an error', () => {
+            // @ts-expect-error - strings are not supported
             expect(() => { errcode('my message'); }).to.throwError((err) => {
                 expect(err).to.be.a(TypeError);
             });
@@ -15,6 +16,7 @@ describe('errcode', () => {
     describe('error as first argument', () => {
         it('should accept an error and do nothing', () => {
             const myErr = new Error('my message');
+            // @ts-expect-error - more args are expected
             const err = errcode(myErr);
 
             expect(err).to.be(myErr);
@@ -107,6 +109,10 @@ describe('errcode', () => {
 
         it('should add a code to a class that extends Error', () => {
             class CustomError extends Error {
+                // eslint-disable-next-line valid-jsdoc
+                /**
+                 * @param {any} val
+                 */
                 set code(val) {
                     throw new Error('Nope!');
                 }
@@ -134,6 +140,7 @@ describe('errcode', () => {
         });
 
         it('should support errors that are not Errors', () => {
+            // @ts-expect-error - API not supported at type level
             const err = errcode({
                 message: 'Oh noes!',
             }, 'ERR_WAT');
@@ -145,12 +152,14 @@ describe('errcode', () => {
 
     describe('falsy first arguments', () => {
         it('should not allow passing null as the first argument', () => {
+            // @ts-expect-error - null is not valid param
             expect(() => { errcode(null); }).to.throwError((err) => {
                 expect(err).to.be.a(TypeError);
             });
         });
 
         it('should not allow passing undefined as the first argument', () => {
+            // @ts-expect-error - undefined is not valid param
             expect(() => { errcode(undefined); }).to.throwError((err) => {
                 expect(err).to.be.a(TypeError);
             });
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..1c29e7a
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,41 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    // project options
+    "allowJs": true,
+    "checkJs": true,
+    "target": "ES2019",
+    "lib": [
+      "ES2019",
+      "ES2020.Promise",
+      "ES2020.String",
+      "ES2020.BigInt",
+      "DOM",
+      "DOM.Iterable"
+    ],
+    "noEmit": true,
+    "noEmitOnError": true,
+    "incremental": true,
+    "composite": true,
+    "isolatedModules": true,
+    "removeComments": false,
+    // module resolution
+    "esModuleInterop": true,
+    "moduleResolution": "node",
+    // linter checks
+    "noImplicitReturns": false,
+    "noFallthroughCasesInSwitch": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": false,
+    // advanced
+    "importsNotUsedAsValues": "error",
+    "forceConsistentCasingInFileNames": true,
+    "skipLibCheck": true,
+    "stripInternal": true,
+    "resolveJsonModule": true
+  },
+  "include": [
+    "./*.ts",
+    "test"
+  ]
+}