refactor(vscode): run TypeScript compiler on the extension

As part of the linting step, run the `tsc` TypeScript compiler on the
code base to ensure the type usage is actually correct, as esbuild only
strips type information.

Also, apply the default tsconfig.json from fresh Bun projects (`bun
init`).

vscode-extension/package.json

@@ -230,24 +230,25 @@
     "esbuild": "esbuild src/extension.ts --outfile=dist/extension.js --external:vscode --format=cjs --platform=node --bundle",
     "watch": "bun run esbuild --watch",
     "build": "bun run esbuild --minify",
-    "lint": "biome check --apply src/*.ts",
+    "lint": "tsc && biome check --apply src/*.ts",
     "schemas": "js-yaml schemas/mabo.yaml > schemas/mabo.json",
     "syntaxes": "js-yaml syntaxes/mabo.tmLanguage.yaml > syntaxes/mabo.tmLanguage.json",
     "vscode:prepublish": "bun run schemas && bun run syntaxes && bun run build",
     "package": "vsce package"
   },
   "engines": {
     "node": ">=21",
-    "vscode": "^1.86.0"
+    "vscode": "^1.82.0"
   },
   "dependencies": {
     "vscode-languageclient": "^9.0.1"
   },
   "devDependencies": {
     "@biomejs/biome": "^1.5.3",
-    "@types/vscode": "~1.86.0",
+    "@types/vscode": "~1.82.0",
     "@vscode/vsce": "~2.24.0",
     "esbuild": "^0.20.1",
-    "js-yaml": "^4.1.0"
+    "js-yaml": "^4.1.0",
+    "typescript": "^5.3.3"
   }
 }

vscode-extension/src/extension.ts

@@ -1,9 +1,9 @@
-import { ExtensionContext, commands, workspace } from "vscode";
+import { type ExtensionContext, commands, workspace } from "vscode";
 import {
-  Executable,
+  type Executable,
   LanguageClient,
-  LanguageClientOptions,
-  ServerOptions,
+  type LanguageClientOptions,
+  type ServerOptions,
   TransportKind,
 } from "vscode-languageclient/node";
 

vscode-extension/tsconfig.json

@@ -0,0 +1,27 @@
+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}