Refactor/typescript migration deps (#909)

* refactor(tsconfig): Reorganize tsconfig.json to prep for typescript migration.

Bump target version to ES6 as it meets 95% compatibility threshold.
Include es2022 lib for Object.hasOwn and other useful checks for typescript compat.
Enumerates tsconfig type checking options. Ideally, as the migration progresses, more of these feature flags can be enabled until strict mode can be turned on.
Split into a build config and a type checking config to use parser services

Signed-off-by: Drew Hoener <[email protected]>

* refactor(types): Add expected error after setting the subscribe callback

Signed-off-by: Drew Hoener <[email protected]>

* refactor(eslint): Add type aware eslint config, disable rules that conflict for now

Signed-off-by: Drew Hoener <[email protected]>

---------

Signed-off-by: Drew Hoener <[email protected]>

Author: drewhoener

.npmignore

@@ -8,3 +8,4 @@ examples
 jsdoc_conf.json
 test
 tsconfig.json
+tsconfig.build.json

eslint.config.js

@@ -1,9 +1,29 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
 import globals from 'globals';
 
-export default [
+export default tseslint.config(
+  eslint.configs.recommended,
+  {
+    // Linting rules for TS files, should be combined with the base config when migration is complete
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      ...tseslint.configs.strictTypeChecked,
+      ...tseslint.configs.stylisticTypeChecked,
+    ],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        projectService: true,
+      },
+    }
+  },
   {
     languageOptions: {
       'globals': {
+        ...globals.es2020,
         ...globals.browser,
         ...globals.node,
         'bson': true
@@ -18,6 +38,14 @@ export default [
   {
     ignores: ['dist']
   },
+  {
+    // FIXME: Recommended rules that have been turned off to maintain compatibility with the current codebase
+    rules: {
+      'no-useless-escape': 0,
+      'no-unused-vars': 0,
+      'no-prototype-builtins': 0,
+    }
+  },
   {
     rules: {
       curly: 2,
@@ -35,6 +63,6 @@ export default [
       'linebreak-style': 2,
       'key-spacing': [2, {afterColon: true}]
     },
-    files: ['**/*.{js,jsx,cjs}']
+    files: ['**/*.{js,jsx,ts,tsx,cjs}'],
   }
-];
+);