feat: switch to TypeScript and ESM

BREAKING CHANGE: Minimum Node version is now 14.16.x and
ESM exports might require updates to your tooling

.eslintrc

@@ -1,21 +1,22 @@
 {
-  "extends": "airbnb-base",
-  "env": {
-    "node": true,
-    "mocha": true
-  },
-  "globals": {
-    "expect": false,
-    "describe": false
-  },
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+  "extends": [
+    "airbnb-base",
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
   "rules": {
+    "@typescript-eslint/no-explicit-any": 0,
     "consistent-return": 0,
     "import/no-extraneous-dependencies": [
       "error",
       {
-        "devDependencies": ["**/*.test.js"]
+        "devDependencies": ["**/*.test.js", "**/*.test.ts"]
       }
     ],
+    "import/extensions": 0,
+    "import/no-unresolved": 0,
     "max-len": 0,
     "no-console": 0,
     "no-param-reassign": 0,

.mocharc.json

@@ -0,0 +1,6 @@
+{
+  "extension": ["ts"],
+  "loader": "ts-node/esm",
+  "require": "ts-node/register",
+  "spec": "lib/**/*.test.ts"
+}

.nvmrc

@@ -1 +1 @@
-16.13.0
+16.15.1

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "standard.enable": false
+}

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2013-2021 Eric Dobbertin
+Copyright (c) 2013-2022 Eric Dobbertin
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in

lib/index.ts

@@ -0,0 +1,17 @@
+import MongoObject from './mongo-object.js';
+
+export {
+  appendAffectedKey,
+  cleanNulls,
+  expandKey,
+  extractOp,
+  genericKeyAffectsOtherGenericKey,
+  isBasicObject,
+  keyToPosition,
+  makeKeyGeneric,
+  reportNulls,
+} from './util.js';
+
+export { MongoObject };
+
+export default MongoObject;