Add basic tsconfig.json setup

Author: wooorm

.gitignore

@@ -1,4 +1,6 @@
 .DS_Store
+*.d.ts.map
+*.d.ts
 *.log
 build/
 data/

package.json

@@ -90,6 +90,8 @@
     "stylelint-config-standard": "^36.0.0",
     "to-vfile": "^8.0.0",
     "trough": "^2.0.0",
+    "type-coverage": "^2.0.0",
+    "typescript": "^5.0.0",
     "unified": "^11.0.0",
     "unist-util-visit": "^5.0.0",
     "vfile-matter": "^5.0.0",
@@ -99,6 +101,7 @@
     "xo": "^0.58.0"
   },
   "scripts": {
+    "build": "tsc --build --clean && tsc --build && type-coverage",
     "start": "budo --dir build",
     "format": "remark . -qo && prettier . -w --log-level warn && stylelint \"**/*.css\" --fix && xo --fix",
     "crawl:sponsors": "mkdir -p data; node crawl/sponsors",

tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "checkJs": true,
+    "customConditions": ["development"],
+    "declaration": true,
+    "declarationMap": true,
+    "emitDeclarationOnly": true,
+    // To do: uncomment.
+    // "exactOptionalPropertyTypes": true,
+    // To do: no `dom`.
+    "lib": ["dom", "es2022"],
+    "module": "node16",
+    // To do: remove.
+    "skipLibCheck": true,
+    // To do: uncomment.
+    // "strict": true,
+    "target": "es2022"
+  },
+  "exclude": ["coverage/", "node_modules/"],
+  "include": ["**/*.js"]
+}