diff --git a/.eslintrc.yml b/.eslintrc.yml
new file mode 100644
index 0000000..66131d3
--- /dev/null
+++ b/.eslintrc.yml
@@ -0,0 +1,13 @@
+root: true
+parser: '@typescript-eslint/parser'
+plugins: ['@typescript-eslint']
+extends:
+  - eslint:recommended
+  - plugin:@typescript-eslint/eslint-recommended
+  - plugin:@typescript-eslint/recommended
+  - prettier/@typescript-eslint
+rules:
+  # '@typescript-eslint/explicit-function-return-type': 0
+  '@typescript-eslint/no-use-before-define':
+    - 2
+    - functions: false
diff --git a/.prettierrc.yml b/.prettierrc.yml
new file mode 100644
index 0000000..7f16d8d
--- /dev/null
+++ b/.prettierrc.yml
@@ -0,0 +1,5 @@
+arrowParens: avoid
+bracketSpacing: false
+semi: false
+singleQuote: true
+trailingComma: none
diff --git a/__test__/async-function.test.ts b/__test__/async-function.test.ts
index c85845c..d68b302 100644
--- a/__test__/async-function.test.ts
+++ b/__test__/async-function.test.ts
@@ -1,8 +1,10 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
 import {callAsyncFunction} from '../src/async-function'
 
 describe('callAsyncFunction', () => {
   test('calls the function with its arguments', async () => {
-    const result = await callAsyncFunction({foo: 'bar'}, 'return foo')
+    const result = await callAsyncFunction({foo: 'bar'} as any, 'return foo')
     expect(result).toEqual('bar')
   })
 
@@ -10,17 +12,17 @@ describe('callAsyncFunction', () => {
     expect.assertions(1)
 
     try {
-      await callAsyncFunction({}, 'proces')
+      await callAsyncFunction({} as any, 'proces')
     } catch (err) {
       expect(err).toBeInstanceOf(ReferenceError)
     }
   })
 
   test('can access process', async () => {
-    await callAsyncFunction({}, 'process')
+    await callAsyncFunction({} as any, 'process')
   })
 
   test('can access console', async () => {
-    await callAsyncFunction({}, 'console')
+    await callAsyncFunction({} as any, 'console')
   })
 })
diff --git a/dist/index.js b/dist/index.js
index 055d6da..02c4f48 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -9274,7 +9274,7 @@ var core = __webpack_require__(470);
 var lib_github = __webpack_require__(469);
 
 // CONCATENATED MODULE: ./src/async-function.ts
-const AsyncFunction = Object.getPrototypeOf(async () => { }).constructor;
+const AsyncFunction = Object.getPrototypeOf(async () => null).constructor;
 function callAsyncFunction(args, source) {
     const fn = new AsyncFunction(...Object.keys(args), source);
     return fn(...Object.values(args));
@@ -9300,7 +9300,7 @@ async function main() {
         opts.previews = previews.split(',');
     const github = new lib_github.GitHub(token, opts);
     const script = Object(core.getInput)('script', { required: true });
-    // Using property/value shorthand on `require` (e.g. `{require}`) causes compilatin errors.
+    // Using property/value shorthand on `require` (e.g. `{require}`) causes compilation errors.
     const result = await callAsyncFunction({ require: __webpack_require__(875), github, context: lib_github.context, core: core }, script);
     let encoding = Object(core.getInput)('result-encoding');
     encoding = encoding ? encoding : 'json';
@@ -9317,14 +9317,10 @@ async function main() {
     }
     Object(core.setOutput)('result', output);
 }
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
 function handleError(err) {
     console.error(err);
-    if (err && err.message) {
-        Object(core.setFailed)(err.message);
-    }
-    else {
-        Object(core.setFailed)(`Unhandled error: ${err}`);
-    }
+    Object(core.setFailed)(`Unhandled error: ${err}`);
 }
 
 
diff --git a/package-lock.json b/package-lock.json
index 3179ea8..4330408 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -376,15 +376,6 @@
         "@babel/helper-plugin-utils": "^7.8.0"
       }
     },
-    "@babel/runtime": {
-      "version": "7.8.4",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.8.4.tgz",
-      "integrity": "sha512-neAp3zt80trRVBI1x0azq6c57aNBqYZH8KhMm3TaB7wEI5Q4A2SHfBHE8w9gOhI/lrqxtEbXZgQIrHP+wvSGwQ==",
-      "dev": true,
-      "requires": {
-        "regenerator-runtime": "^0.13.2"
-      }
-    },
     "@babel/template": {
       "version": "7.8.6",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.8.6.tgz",
@@ -978,6 +969,12 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
+    "@types/eslint-visitor-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
+      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
+      "dev": true
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -1013,6 +1010,12 @@
         "pretty-format": "^25.1.0"
       }
     },
+    "@types/json-schema": {
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.4.tgz",
+      "integrity": "sha512-8+KAKzEvSUdeo+kmqnKrqgeE+LcA0tjYWFY7RPProVYwnqDjukzO+3b6dLD56rYX5TdWejnEOLJYOIeh4CXKuA==",
+      "dev": true
+    },
     "@types/node": {
       "version": "13.13.5",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-13.13.5.tgz",
@@ -1045,6 +1048,65 @@
       "integrity": "sha512-FA/BWv8t8ZWJ+gEOnLLd8ygxH/2UFbAvgEonyfN6yWGLKc7zVjbpl2Y4CTjid9h2RfgPP6SEt6uHwEOply00yw==",
       "dev": true
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "2.33.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.33.0.tgz",
+      "integrity": "sha512-QV6P32Btu1sCI/kTqjTNI/8OpCYyvlGjW5vD8MpTIg+HGE5S88HtT1G+880M4bXlvXj/NjsJJG0aGcVh0DdbeQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "2.33.0",
+        "functional-red-black-tree": "^1.0.1",
+        "regexpp": "^3.0.0",
+        "tsutils": "^3.17.1"
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "2.33.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.33.0.tgz",
+      "integrity": "sha512-qzPM2AuxtMrRq78LwyZa8Qn6gcY8obkIrBs1ehqmQADwkYzTE1Pb4y2W+U3rE/iFkSWcWHG2LS6MJfj6SmHApg==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/typescript-estree": "2.33.0",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0"
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "2.33.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-2.33.0.tgz",
+      "integrity": "sha512-AUtmwUUhJoH6yrtxZMHbRUEMsC2G6z5NSxg9KsROOGqNXasM71I8P2NihtumlWTUCRld70vqIZ6Pm4E5PAziEA==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "2.33.0",
+        "@typescript-eslint/typescript-estree": "2.33.0",
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "2.33.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.33.0.tgz",
+      "integrity": "sha512-d8rY6/yUxb0+mEwTShCQF2zYQdLlqihukNfG9IUlLYz5y1CH6G/9XYbrxQLq3Z14RNvkCC6oe+OcFlyUpwUbkg==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.1",
+        "eslint-visitor-keys": "^1.1.0",
+        "glob": "^7.1.6",
+        "is-glob": "^4.0.1",
+        "lodash": "^4.17.15",
+        "semver": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.3.2",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
+          "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==",
+          "dev": true
+        }
+      }
+    },
     "@zeit/ncc": {
       "version": "0.22.0",
       "resolved": "https://registry.npmjs.org/@zeit/ncc/-/ncc-0.22.0.tgz",
@@ -1081,6 +1143,12 @@
         }
       }
     },
+    "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
+    },
     "acorn-walk": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
@@ -1491,6 +1559,12 @@
         "supports-color": "^7.1.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -1526,6 +1600,21 @@
         }
       }
     },
+    "cli-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^3.1.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.1.tgz",
+      "integrity": "sha512-GRMWDxpOB6Dgk2E5Uo+3eEBvtOOlimMmpbFiKuLFnQzYDavtLFY3K5ona41jgN/WdRZtG7utuVSVTL4HbZHGkw==",
+      "dev": true
+    },
     "cliui": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
@@ -1796,6 +1885,15 @@
       "integrity": "sha512-nFIfVk5B/NStCsJ+zaPO4vYuLjlzQ6uFvPxzYyHlejNZ/UGa7G/n7peOXVrVNvRuyfstt+mZQYGpjxg9Z6N8Kw==",
       "dev": true
     },
+    "doctrine": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "domexception": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/domexception/-/domexception-1.0.1.tgz",
@@ -1887,12 +1985,240 @@
         "source-map": "~0.6.1"
       }
     },
+    "eslint": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.0.0.tgz",
+      "integrity": "sha512-qY1cwdOxMONHJfGqw52UOpZDeqXy8xmD0u8CT6jIstil72jkhURC704W8CFyTPDPllz4z4lu0Ql1+07PG/XdIg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "ajv": "^6.10.0",
+        "chalk": "^4.0.0",
+        "cross-spawn": "^7.0.2",
+        "debug": "^4.0.1",
+        "doctrine": "^3.0.0",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0",
+        "eslint-visitor-keys": "^1.1.0",
+        "espree": "^7.0.0",
+        "esquery": "^1.2.0",
+        "esutils": "^2.0.2",
+        "file-entry-cache": "^5.0.1",
+        "functional-red-black-tree": "^1.0.1",
+        "glob-parent": "^5.0.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.0.0",
+        "imurmurhash": "^0.1.4",
+        "inquirer": "^7.0.0",
+        "is-glob": "^4.0.0",
+        "js-yaml": "^3.13.1",
+        "json-stable-stringify-without-jsonify": "^1.0.1",
+        "levn": "^0.4.1",
+        "lodash": "^4.17.14",
+        "minimatch": "^3.0.4",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.9.1",
+        "progress": "^2.0.0",
+        "regexpp": "^3.1.0",
+        "semver": "^7.2.1",
+        "strip-ansi": "^6.0.0",
+        "strip-json-comments": "^3.1.0",
+        "table": "^5.2.3",
+        "text-table": "^0.2.0",
+        "v8-compile-cache": "^2.0.3"
+      },
+      "dependencies": {
+        "chalk": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.0.0.tgz",
+          "integrity": "sha512-N9oWFcegS0sFr9oh1oz2d7Npos6vNoWW9HvtCg5N1KRFpUhaAhvTv5Y58g880fZaEYSNm3qDz8SU1UrGvp+n7A==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "cross-spawn": {
+          "version": "7.0.2",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.2.tgz",
+          "integrity": "sha512-PD6G8QG3S4FK/XCGFbEQrDqO2AnMMsy0meR7lerlIOHAAbkuavGU/pOqprrlvfTNjvowivTeBsjebAL0NSoMxw==",
+          "dev": true,
+          "requires": {
+            "path-key": "^3.1.0",
+            "shebang-command": "^2.0.0",
+            "which": "^2.0.1"
+          }
+        },
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
+        "levn": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
+          "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
+          "dev": true,
+          "requires": {
+            "prelude-ls": "^1.2.1",
+            "type-check": "~0.4.0"
+          }
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+          "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
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+          "dev": true,
+          "requires": {
+            "deep-is": "^0.1.3",
+            "fast-levenshtein": "^2.0.6",
+            "levn": "^0.4.1",
+            "prelude-ls": "^1.2.1",
+            "type-check": "^0.4.0",
+            "word-wrap": "^1.2.3"
+          }
+        },
+        "path-key": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
+          "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+          "dev": true
+        },
+        "prelude-ls": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+          "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
+          "dev": true
+        },
+        "semver": {
+          "version": "7.3.2",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
+          "integrity": "sha512-OrOb32TeeambH6UrhtShmF7CRDqhL6/5XpPNp2DuRH6+9QLw/orhp72j87v8Qa1ScDkvrrBNpZcDejAirJmfXQ==",
+          "dev": true
+        },
+        "shebang-command": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+          "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+          "dev": true,
+          "requires": {
+            "shebang-regex": "^3.0.0"
+          }
+        },
+        "shebang-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
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+          "dev": true
+        },
+        "type-check": {
+          "version": "0.4.0",
+          "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+          "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+          "dev": true,
+          "requires": {
+            "prelude-ls": "^1.2.1"
+          }
+        },
+        "type-fest": {
+          "version": "0.8.1",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+          "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+          "dev": true
+        },
+        "which": {
+          "version": "2.0.2",
+          "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+          "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+          "dev": true,
+          "requires": {
+            "isexe": "^2.0.0"
+          }
+        }
+      }
+    },
+    "eslint-config-prettier": {
+      "version": "6.11.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-6.11.0.tgz",
+      "integrity": "sha512-oB8cpLWSAjOVFEJhhyMZh6NOEOtBVziaqdDQ86+qhDHFbZXoRTM7pNSvFRfW/W/L/LrQ38C99J5CGuRBBzBsdA==",
+      "dev": true,
+      "requires": {
+        "get-stdin": "^6.0.0"
+      }
+    },
+    "eslint-scope": {
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+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
     "tmpl": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
@@ -4973,6 +5813,21 @@
         "yargs-parser": "^16.1.0"
       }
     },
+    "tslib": {
+      "version": "1.13.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+      "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
+      "dev": true
+    },
+    "tsutils": {
+      "version": "3.17.1",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
+      "integrity": "sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
     "tunnel": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.6.tgz",
@@ -5134,6 +5989,12 @@
       "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
       "dev": true
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
     "v8-to-istanbul": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-4.1.2.tgz",
@@ -5153,6 +6014,16 @@
         }
       }
     },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
     "verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
@@ -5275,6 +6146,15 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "write-file-atomic": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
@@ -5312,13 +6192,10 @@
       "dev": true
     },
     "yaml": {
-      "version": "1.7.2",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.7.2.tgz",
-      "integrity": "sha512-qXROVp90sb83XtAoqE8bP9RwAkTTZbugRUTm5YeFCBfNRPEp2YzTeqWiz7m5OORHzEvrA/qcGS8hp/E+MMROYw==",
-      "dev": true,
-      "requires": {
-        "@babel/runtime": "^7.6.3"
-      }
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.0.tgz",
+      "integrity": "sha512-yr2icI4glYaNG+KWONODapy2/jDdMSDnrONSjblABjD9B4Z5LgiircSt8m8sRZFNi08kG9Sm0uSHtEmP3zaEGg==",
+      "dev": true
     },
     "yargs": {
       "version": "15.3.1",
diff --git a/package.json b/package.json
index 2459818..ab2f137 100644
--- a/package.json
+++ b/package.json
@@ -3,21 +3,20 @@
   "description": "A GitHub action for executing a simple script",
   "version": "0.9.0",
   "author": "GitHub",
-  "dependencies": {
-    "@actions/core": "^1.2.4",
-    "@actions/github": "^2.2.0"
-  },
-  "devDependencies": {
-    "@types/jest": "^25.1.4",
-    "@zeit/ncc": "^0.22.0",
-    "husky": "^4.2.3",
-    "jest": "^25.1.0",
-    "ts-jest": "^25.2.1",
-    "typescript": "^3.8.3"
+  "license": "MIT",
+  "main": "dist/index.js",
+  "private": true,
+  "scripts": {
+    "build": "ncc build src/main.ts",
+    "format": "prettier --write src __test__",
+    "lint": "eslint src __test__",
+    "check": "run-p --continue-on-error --aggregate-output format lint",
+    "pre-commit": "run-s check test build",
+    "test": "jest"
   },
   "husky": {
     "hooks": {
-      "pre-commit": "npm run build && git add dist/"
+      "pre-commit": "npm run pre-commit && git add dist/"
     }
   },
   "jest": {
@@ -33,11 +32,22 @@
       }
     }
   },
-  "license": "MIT",
-  "main": "dist/index.js",
-  "private": true,
-  "scripts": {
-    "build": "ncc build src/main.ts",
-    "test": "jest"
+  "dependencies": {
+    "@actions/core": "^1.2.4",
+    "@actions/github": "^2.2.0"
+  },
+  "devDependencies": {
+    "@types/jest": "^25.1.4",
+    "@typescript-eslint/eslint-plugin": "^2.33.0",
+    "@typescript-eslint/parser": "^2.33.0",
+    "@zeit/ncc": "^0.22.0",
+    "eslint": "^7.0.0",
+    "eslint-config-prettier": "^6.11.0",
+    "husky": "^4.2.5",
+    "jest": "^25.1.0",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^2.0.5",
+    "ts-jest": "^25.2.1",
+    "typescript": "^3.8.3"
   }
 }
diff --git a/src/async-function.ts b/src/async-function.ts
index cfcdd4c..a27503f 100644
--- a/src/async-function.ts
+++ b/src/async-function.ts
@@ -1,11 +1,20 @@
-const AsyncFunction = Object.getPrototypeOf(async () => {}).constructor
+import * as core from '@actions/core'
+import {GitHub} from '@actions/github'
+import {Context} from '@actions/github/lib/context'
 
-type AsyncFunctionArguments = {[key: string]: any}
+const AsyncFunction = Object.getPrototypeOf(async () => null).constructor
 
-export function callAsyncFunction(
+type AsyncFunctionArguments = {
+  context: Context
+  core: typeof core
+  github: GitHub
+  require: NodeRequire
+}
+
+export function callAsyncFunction<T>(
   args: AsyncFunctionArguments,
   source: string
-): Promise<any> {
+): Promise<T> {
   const fn = new AsyncFunction(...Object.keys(args), source)
   return fn(...Object.values(args))
 }
diff --git a/src/main.ts b/src/main.ts
index 00e95a1..becbc56 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -5,19 +5,27 @@ import {callAsyncFunction} from './async-function'
 process.on('unhandledRejection', handleError)
 main().catch(handleError)
 
-async function main() {
+type Options = {
+  log?: Console
+  userAgent?: string
+  previews?: string[]
+}
+
+async function main(): Promise<void> {
   const token = core.getInput('github-token', {required: true})
   const debug = core.getInput('debug')
   const userAgent = core.getInput('user-agent')
   const previews = core.getInput('previews')
-  const opts: {[key: string]: any} = {}
+
+  const opts: Options = {}
   if (debug === 'true') opts.log = console
   if (userAgent != null) opts.userAgent = userAgent
   if (previews != null) opts.previews = previews.split(',')
+
   const github = new GitHub(token, opts)
   const script = core.getInput('script', {required: true})
 
-  // Using property/value shorthand on `require` (e.g. `{require}`) causes compilatin errors.
+  // Using property/value shorthand on `require` (e.g. `{require}`) causes compilation errors.
   const result = await callAsyncFunction(
     {require: require, github, context, core},
     script
@@ -42,12 +50,8 @@ async function main() {
   core.setOutput('result', output)
 }
 
-function handleError(err: any) {
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function handleError(err: any): void {
   console.error(err)
-
-  if (err && err.message) {
-    core.setFailed(err.message)
-  } else {
-    core.setFailed(`Unhandled error: ${err}`)
-  }
+  core.setFailed(`Unhandled error: ${err}`)
 }