diff --git a/src/runtime/javascript/.eslintignore b/src/runtime/javascript/.eslintignore
new file mode 100644
index 000000000..f06235c46
--- /dev/null
+++ b/src/runtime/javascript/.eslintignore
@@ -0,0 +1,2 @@
+node_modules
+dist
diff --git a/src/runtime/javascript/.eslintrc.js b/src/runtime/javascript/.eslintrc.js
new file mode 100644
index 000000000..ccf5c1a86
--- /dev/null
+++ b/src/runtime/javascript/.eslintrc.js
@@ -0,0 +1,11 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+  ]
+}
diff --git a/src/runtime/javascript/index.ts b/src/runtime/javascript/index.ts
index 42c3fb05d..e881bab84 100644
--- a/src/runtime/javascript/index.ts
+++ b/src/runtime/javascript/index.ts
@@ -35,7 +35,7 @@ const PgfItor = Struct({
 const PgfItorPtr = ref.refType(PgfItor)
 
 const PgfType = ref.types.void // TODO
-const PgfTypePtr = ref.refType(PgfType)
+// const PgfTypePtr = ref.refType(PgfType)
 
 const PgfTypeHypo = ref.types.void // TODO
 const PgfTypeHypoPtr = ref.refType(PgfTypeHypo)
@@ -58,7 +58,7 @@ const PgfMarshallerPtr = ref.refType(PgfMarshaller)
 
 // Type definitions for `ref` package don't include extensions to Buffer
 interface Pointer extends Buffer {
-  deref(): any
+  deref (): any // eslint-disable-line @typescript-eslint/no-explicit-any
 }
 
 class PGFError extends Error {
@@ -123,10 +123,10 @@ function handleError (errPtr: Pointer): void {
     case 0: return
 
     // PGF_EXN_SYSTEM_ERROR
-    case 1:
+    case 1: {
       const desc = errno.lookup(err.code)
       throw new Error(`${desc}: ${err.msg}`)
-
+    }
     // PGF_EXN_PGF_ERROR
     case 2:
       throw new PGFError(err.msg)
@@ -159,21 +159,21 @@ export class PGFGrammar {
   }
 
   // NB the library user is responsible for calling this
-  release () {
+  release (): void {
     runtime.pgf_free_revision(this.db, this.revision)
   }
 
-  getAbstractName () {
+  getAbstractName (): string {
     const err = ref.alloc(PgfExn) as Pointer
     const txt = runtime.pgf_abstract_name(this.db, this.revision, err)
     handleError(err)
     return PgfText_AsString(txt)
   }
 
-  getCategories () {
-    const cats = new Array()
+  getCategories (): string[] {
+    const cats: string[] = []
     const callback = ffi.Callback(ref.types.void, [ PgfItorPtr, PgfTextPtr, voidPtr, PgfExnPtr],
-      function (self: Pointer, key: Pointer, value: Pointer, err: Pointer) {
+      function (self: Pointer, key: Pointer, value: Pointer, err: Pointer) { // eslint-disable-line @typescript-eslint/no-unused-vars
         const k = PgfText_AsString(key)
         cats.push(k)
     })
@@ -183,10 +183,10 @@ export class PGFGrammar {
     return cats
   }
 
-  getFunctions () {
-    const funs = new Array()
+  getFunctions (): string[] {
+    const funs: string[] = []
     const callback = ffi.Callback(ref.types.void, [ PgfItorPtr, PgfTextPtr, voidPtr, PgfExnPtr],
-      function (self: Pointer, key: Pointer, value: Pointer, err: Pointer) {
+      function (self: Pointer, key: Pointer, value: Pointer, err: Pointer) { // eslint-disable-line @typescript-eslint/no-unused-vars
         const k = PgfText_AsString(key)
         funs.push(k)
     })
diff --git a/src/runtime/javascript/package-lock.json b/src/runtime/javascript/package-lock.json
index 276fb0c0a..334e729ef 100644
--- a/src/runtime/javascript/package-lock.json
+++ b/src/runtime/javascript/package-lock.json
@@ -474,6 +474,95 @@
       "integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==",
       "dev": true
     },
+    "@eslint/eslintrc": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.3.tgz",
+      "integrity": "sha512-J6KFFz5QCYUJq3pf0mjEcCJVERbzv71PUIDczuh9JkwGEzced6CO5ADLHB1rbf/+oPBtoPfMYNOpGDzCANlbXw==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^13.9.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "globals": {
+          "version": "13.11.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-13.11.0.tgz",
+          "integrity": "sha512-08/xrJ7wQjK9kkkRoI3OFUBbLx4f+6x3SGwcPvQ0QH6goFDrOU2oyAWrmh3dJezu65buo+HBMzAMQy6rovVC3g==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.20.2"
+          }
+        },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "type-fest": {
+          "version": "0.20.2",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
+          "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
+          "dev": true
+        }
+      }
+    },
+    "@humanwhocodes/config-array": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.5.0.tgz",
+      "integrity": "sha512-FagtKFz74XrTl7y6HCzQpwDfXP0yhxe9lHLD1UZxjvZIcbyRz8zTFF/yYNfSfzU414eDwZ1SrO0Qvtyf+wFMQg==",
+      "dev": true,
+      "requires": {
+        "@humanwhocodes/object-schema": "^1.2.0",
+        "debug": "^4.1.1",
+        "minimatch": "^3.0.4"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
+      }
+    },
+    "@humanwhocodes/object-schema": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-1.2.0.tgz",
+      "integrity": "sha512-wdppn25U8z/2yiaT6YGquE6X8sSv7hNMWSXYSSU1jGv/yd6XqjXgTDJ8KP4NgjTXfJ3GbRjeeb8RTV7a/VpM+w==",
+      "dev": true
+    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -683,6 +772,32 @@
         "chalk": "^4.0.0"
       }
     },
+    "@nodelib/fs.scandir": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
+      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.stat": "2.0.5",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
+      "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
+      "dev": true
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
+      "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.scandir": "2.1.5",
+        "fastq": "^1.6.0"
+      }
+    },
     "@sinonjs/commons": {
       "version": "1.8.3",
       "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.3.tgz",
@@ -802,6 +917,12 @@
         "pretty-format": "^27.0.0"
       }
     },
+    "@types/json-schema": {
+      "version": "7.0.9",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.9.tgz",
+      "integrity": "sha512-qcUXuemtEu+E5wZSJHNxUXeCZhAfXKQ41D+duX+VYPde7xyEVZci+/oXKJL13tnRs9lR2pr4fod59GT6/X1/yQ==",
+      "dev": true
+    },
     "@types/node": {
       "version": "16.10.2",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-16.10.2.tgz",
@@ -853,6 +974,158 @@
       "integrity": "sha512-7tFImggNeNBVMsn0vLrpn1H1uPrUBdnARPTpZoitY37ZrdJREzf7I16tMrlK3hen349gr1NYh8CmZQa7CTG6Aw==",
       "dev": true
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "4.32.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.32.0.tgz",
+      "integrity": "sha512-+OWTuWRSbWI1KDK8iEyG/6uK2rTm3kpS38wuVifGUTDB6kjEuNrzBI1MUtxnkneuWG/23QehABe2zHHrj+4yuA==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "4.32.0",
+        "@typescript-eslint/scope-manager": "4.32.0",
+        "debug": "^4.3.1",
+        "functional-red-black-tree": "^1.0.1",
+        "ignore": "^5.1.8",
+        "regexpp": "^3.1.0",
+        "semver": "^7.3.5",
+        "tsutils": "^3.21.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "semver": {
+          "version": "7.3.5",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
+          "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "4.32.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.32.0.tgz",
+      "integrity": "sha512-WLoXcc+cQufxRYjTWr4kFt0DyEv6hDgSaFqYhIzQZ05cF+kXfqXdUh+//kgquPJVUBbL3oQGKQxwPbLxHRqm6A==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.7",
+        "@typescript-eslint/scope-manager": "4.32.0",
+        "@typescript-eslint/types": "4.32.0",
+        "@typescript-eslint/typescript-estree": "4.32.0",
+        "eslint-scope": "^5.1.1",
+        "eslint-utils": "^3.0.0"
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "4.32.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.32.0.tgz",
+      "integrity": "sha512-lhtYqQ2iEPV5JqV7K+uOVlPePjClj4dOw7K4/Z1F2yvjIUvyr13yJnDzkK6uon4BjHYuHy3EG0c2Z9jEhFk56w==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/scope-manager": "4.32.0",
+        "@typescript-eslint/types": "4.32.0",
+        "@typescript-eslint/typescript-estree": "4.32.0",
+        "debug": "^4.3.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
+      }
+    },
+    "@typescript-eslint/scope-manager": {
+      "version": "4.32.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.32.0.tgz",
+      "integrity": "sha512-DK+fMSHdM216C0OM/KR1lHXjP1CNtVIhJ54kQxfOE6x8UGFAjha8cXgDMBEIYS2XCYjjCtvTkjQYwL3uvGOo0w==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.32.0",
+        "@typescript-eslint/visitor-keys": "4.32.0"
+      }
+    },
+    "@typescript-eslint/types": {
+      "version": "4.32.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.32.0.tgz",
+      "integrity": "sha512-LE7Z7BAv0E2UvqzogssGf1x7GPpUalgG07nGCBYb1oK4mFsOiFC/VrSMKbZQzFJdN2JL5XYmsx7C7FX9p9ns0w==",
+      "dev": true
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "4.32.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.32.0.tgz",
+      "integrity": "sha512-tRYCgJ3g1UjMw1cGG8Yn1KzOzNlQ6u1h9AmEtPhb5V5a1TmiHWcRyF/Ic+91M4f43QeChyYlVTcf3DvDTZR9vw==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.32.0",
+        "@typescript-eslint/visitor-keys": "4.32.0",
+        "debug": "^4.3.1",
+        "globby": "^11.0.3",
+        "is-glob": "^4.0.1",
+        "semver": "^7.3.5",
+        "tsutils": "^3.21.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "semver": {
+          "version": "7.3.5",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
+          "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/visitor-keys": {
+      "version": "4.32.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.32.0.tgz",
+      "integrity": "sha512-e7NE0qz8W+atzv3Cy9qaQ7BTLwWsm084Z0c4nIO2l3Bp6u9WIgdqCgyPyV5oSPDMIW3b20H59OOCmVk3jw3Ptw==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.32.0",
+        "eslint-visitor-keys": "^2.0.0"
+      }
+    },
     "abab": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.5.tgz",
@@ -889,6 +1162,12 @@
         }
       }
     },
+    "acorn-jsx": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
+      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
+      "dev": true
+    },
     "agent-base": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
@@ -915,6 +1194,24 @@
         }
       }
     },
+    "ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "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"
+      }
+    },
+    "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==",
+      "dev": true
+    },
     "ansi-escapes": {
       "version": "4.3.2",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.2.tgz",
@@ -958,6 +1255,18 @@
         "sprintf-js": "~1.0.2"
       }
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@@ -2707,6 +3457,12 @@
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@@ -2754,12 +3516,24 @@
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@@ -2794,6 +3574,15 @@
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+      "requires": {
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+        "astral-regex": "^2.0.0",
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+      "resolved": "https://registry.npmjs.org/table/-/table-6.7.2.tgz",
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+      "requires": {
+        "ajv": "^8.0.1",
+        "lodash.clonedeep": "^4.5.0",
+        "lodash.truncate": "^4.4.2",
+        "slice-ansi": "^4.0.0",
+        "string-width": "^4.2.3",
+        "strip-ansi": "^6.0.1"
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+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "json-schema-traverse": "^1.0.0",
+            "require-from-string": "^2.0.2",
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+          }
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+        "json-schema-traverse": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
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+        }
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@@ -2981,6 +3821,12 @@
         "minimatch": "^3.0.4"
       }
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/throat/-/throat-6.0.1.tgz",
@@ -3055,6 +3901,21 @@
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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+      "dev": true
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+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.21.0.tgz",
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+      "dev": true,
+      "requires": {
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+      }
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+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
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+    "v8-compile-cache": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
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     "v8-to-istanbul": {
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diff --git a/src/runtime/javascript/package.json b/src/runtime/javascript/package.json
index 9faf5a334..b0ffadb0e 100644
--- a/src/runtime/javascript/package.json
+++ b/src/runtime/javascript/package.json
@@ -4,6 +4,7 @@
   "description": "JavaScript bindings to the Grammatical Frameworks's PGF runtime",
   "main": "dist/index.js",
   "scripts": {
+    "lint": "npx eslint . --ext .ts",
     "build": "npx tsc",
     "test": "npx jest"
   },
@@ -15,6 +16,9 @@
   "devDependencies": {
     "@types/ffi": "^0.2.3",
     "@types/jest": "^27.0.2",
+    "@typescript-eslint/eslint-plugin": "^4.32.0",
+    "@typescript-eslint/parser": "^4.32.0",
+    "eslint": "^7.32.0",
     "jest": "^27.2.4",
     "ts-jest": "^27.0.5",
     "typescript": "^4.4.3"
diff --git a/src/runtime/javascript/tests/basic.test.ts b/src/runtime/javascript/tests/basic.test.ts
index e0c60674a..050b59036 100644
--- a/src/runtime/javascript/tests/basic.test.ts
+++ b/src/runtime/javascript/tests/basic.test.ts
@@ -29,7 +29,9 @@ describe('bootNGF', () => {
   beforeAll(() => {
     try {
       fs.unlinkSync('./basic.ngf')
-    } catch { }
+    } catch {
+      // empty
+    }
   })
 
   test('valid', () => {