Add lint check (#587)

Changes:

- Added ESLint v9
- Added typescript-eslint (note: I chose to use an v8 alpha version
because this is [the only that supports ESLint
v9](typescript-eslint/typescript-eslint#8211 (comment)).
I think this was preferable than using ESLint v8, which is going to be
deprecated sooner than v9)
- Added eslint-config-prettier to avoid lint conflicts with Prettier
- Replaced custom `throttle` and `debounce` utility function with lodash
functions to fix typing issues
- Added lint step to CI workflow

Author: vgeorge

.github/workflows/test-js.yml

@@ -3,14 +3,13 @@ name: CI
 on:
   push:
     branches:
-      - 'main'
+      - "main"
   pull_request:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
-
 jobs:
   lint-and-test:
     runs-on: ubuntu-latest
@@ -39,10 +38,10 @@ jobs:
         run: npm install
 
       - name: Prettier check
-        run: npm run fmt:check
+        run: npm run prettier:check
 
-      - name: Type check
-        run: npm run typecheck
+      - name: Lint check
+        run: npm run lint
 
       - name: Test
         run: npm run test

eslint.config.js

@@ -0,0 +1,21 @@
+import globals from "globals";
+import pluginJs from "@eslint/js";
+import tseslint from "typescript-eslint";
+import pluginReact from "eslint-plugin-react";
+import eslintConfigPrettier from "eslint-config-prettier";
+
+export default [
+  { files: ["**/*.{js,mjs,cjs,ts,jsx,tsx}"] },
+  { languageOptions: { globals: globals.browser } },
+  pluginJs.configs.recommended,
+  ...tseslint.configs.recommended,
+  pluginReact.configs.flat.recommended,
+  {
+    settings: {
+      react: {
+        version: "detect",
+      },
+    },
+  },
+  eslintConfigPrettier,
+];