Add shareable config TS files and tsconfig.json

Signed-off-by: Émile Ré <emile@getprobo.com>

packages/eslint-config/baseConfigs.ts

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+import * as js from "@eslint/js";
+
+export const baseConfigs = [
+  { ignores: ["dist", "node_modules", "**/*.d.ts"] },
+  js.configs.recommended,
+];

packages/eslint-config/languageOptionsConfigs.ts

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+import { browser, es2022, es2023, node } from "globals"
+
+export const browserLanguageOptionsConfig = {
+  languageOptions: {
+    // Same as the ones we use in our tsconfig compilerOptions.lib for browser
+    ecmaVersion: 2022,
+    globals: {
+      ...browser,
+      ...es2022,
+    },
+    sourceType: "module",
+    parserOptions: {
+      ecmaFeatures: {
+        impliedStrict: true,
+      },
+    },
+  },
+};
+
+export const nodeLanguageOptionsConfig = {
+  languageOptions: {
+    // Same as the ones we use in our tsconfig compilerOptions.lib for node
+    ecmaVersion: 2023,
+    globals: {
+      ...node,
+      ...es2023,
+    },
+    sourceType: "module",
+    parserOptions: {
+      ecmaFeatures: {
+        impliedStrict: true,
+      },
+    },
+  },
+};

packages/eslint-config/reactConfigs.ts

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+import * as react from "eslint-plugin-react";
+import * as reactHooks from "eslint-plugin-react-hooks";
+
+export const reactConfigs = [
+  react.configs.flat.recommended,
+  react.configs.flat["jsx-runtime"],
+  reactHooks.configs.flat.recommended,
+];

packages/eslint-config/stylisticConfigs.ts

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+import stylistic from "@stylistic/eslint-plugin";
+
+export const stylisticConfigs = [
+  stylistic.configs.customize({
+    arrowParens: false, // Will actually set it to "as-needed"
+    blockSpacing: true,
+    braceStyle: "1tbs",
+    commaDangle: "always-multiline",
+    indent: 2,
+    quotes: "double",
+    quoteProps: "consistent-as-needed",
+    semi: true,
+    jsx: true,
+    severity: "error",
+  }),
+  {
+    rules: {
+      "@stylistic/max-len": [
+        "warn",
+        { code: 120, ignoreUrls: true, ignoreStrings: true },
+      ],
+    },
+  },
+];

packages/eslint-config/tsConfigs.ts

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+import tseslint from "typescript-eslint";
+
+export const tsConfigs = [
+  ...tseslint.configs.recommendedTypeChecked,
+  {
+    files: ["**/*.{ts,tsx}"],
+    rules: {
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          "args": "all",
+          "argsIgnorePattern": "^_",
+          "caughtErrors": "all",
+          "caughtErrorsIgnorePattern": "^_",
+          "destructuredArrayIgnorePattern": "^_",
+          "varsIgnorePattern": "^_",
+          "ignoreRestSiblings": true
+        },
+      ],
+    },
+  },
+];

packages/eslint-config/tsconfig.json

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+{
+  "complierOptions": {
+    "lib": ["ES2023"],
+    "skipLibCheck": true,
+    "module": "ESNext",
+    "moduleResolution": "nodenext",
+    "moduleDetection": "force",
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["./*.ts"]
+}