Add JSDoc based types

Author: wooorm

.gitignore

@@ -1,4 +1,5 @@
 .DS_Store
+*.d.ts
 *.log
 coverage/
 node_modules/

index.js

@@ -1,19 +1,34 @@
-// Get the text content of a node.
-// Prefer the node’s plain-text fields, otherwise serialize its children,
-// and if the given value is an array, serialize the nodes in it.
+/**
+ * Get the text content of a node.
+ * Prefer the node’s plain-text fields, otherwise serialize its children,
+ * and if the given value is an array, serialize the nodes in it.
+ *
+ * @param {unknown} node
+ * @returns {string}
+ */
 export function toString(node) {
   return (
     (node &&
+      typeof node === 'object' &&
+      // @ts-ignore looks like a literal.
       (node.value ||
+        // @ts-ignore looks like an image.
         node.alt ||
+        // @ts-ignore looks like an image/link.
         node.title ||
+        // @ts-ignore looks like a parent.
         ('children' in node && all(node.children)) ||
-        ('length' in node && all(node)))) ||
+        (Array.isArray(node) && all(node)))) ||
     ''
   )
 }
 
+/**
+ * @param {Array.<unknown>} values
+ * @returns {string}
+ */
 function all(values) {
+  /** @type {Array.<string>} */
   var result = []
   var index = -1
 

package.json

@@ -27,24 +27,30 @@
   "sideEffects": false,
   "type": "module",
   "main": "index.js",
-  "types": "types/index.d.ts",
+  "types": "index.d.ts",
   "files": [
-    "types/index.d.ts",
+    "index.d.ts",
     "index.js"
   ],
   "devDependencies": {
+    "@types/tape": "^4.0.0",
     "c8": "^7.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
     "remark-preset-wooorm": "^8.0.0",
+    "rimraf": "^3.0.0",
     "tape": "^5.0.0",
+    "type-coverage": "^2.0.0",
+    "typescript": "^4.0.0",
     "xo": "^0.39.0"
   },
   "scripts": {
+    "prepack": "npm run build && npm run format",
+    "build": "rimraf \"*.d.ts\" && tsc && type-coverage",
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
     "test-api": "node test.js",
     "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node test.js",
-    "test": "npm run format && npm run test-coverage"
+    "test": "npm run build && npm run format && npm run test-coverage"
   },
   "prettier": {
     "tabWidth": 2,
@@ -59,14 +65,16 @@
     "rules": {
       "no-var": "off",
       "prefer-arrow-callback": "off"
-    },
-    "ignore": [
-      "types"
-    ]
+    }
   },
   "remarkConfig": {
     "plugins": [
       "preset-wooorm"
     ]
+  },
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "strict": true
   }
 }

tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "include": ["*.js"],
+  "compilerOptions": {
+    "target": "ES2020",
+    "lib": ["ES2020"],
+    "module": "ES2020",
+    "moduleResolution": "node",
+    "allowJs": true,
+    "checkJs": true,
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    "allowSyntheticDefaultImports": true,
+    "skipLibCheck": true
+  }
+}