Add types

Related GH-28.
Closes GH-29.

Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com>
Reviewed-by: Junyoung Choi <fluke8259@gmail.com>
Reviewed-by: Titus Wormer <tituswormer@gmail.com>

package.json

@@ -28,14 +28,18 @@
     "Jonathan Haines <jonno.haines@gmail.com>",
     "Robin Millette <robin@millette.info>"
   ],
+  "types": "types/index.d.ts",
   "files": [
+    "types/index.d.ts",
     "index.js"
   ],
   "dependencies": {
-    "mdast-util-toc": "^4.0.0"
+    "@types/unist": "^2.0.3",
+    "mdast-util-toc": "^5.0.0"
   },
   "devDependencies": {
     "browserify": "^16.0.0",
+    "dtslint": "^2.0.0",
     "is-hidden": "^1.1.0",
     "negate": "^1.0.0",
     "nyc": "^14.0.0",
@@ -45,7 +49,7 @@
     "remark-preset-wooorm": "^6.0.0",
     "tape": "^4.0.0",
     "tinyify": "^2.0.0",
-    "xo": "^0.24.0"
+    "xo": "^0.25.0"
   },
   "scripts": {
     "format": "remark *.md -qfo && prettier --write \"**/*.js\" && xo --fix",
@@ -54,7 +58,8 @@
     "build": "npm run build-bundle && npm run build-mangle",
     "test-api": "node test",
     "test-coverage": "nyc --reporter lcov tape test/index.js",
-    "test": "npm run format && npm run build && npm run test-coverage"
+    "test-types": "dtslint types",
+    "test": "npm run format && npm run build && npm run test-coverage && npm run test-types"
   },
   "prettier": {
     "tabWidth": 2,

test/index.js

@@ -42,7 +42,7 @@ test('Fixtures', function(t) {
 
     try {
       config = JSON.parse(read(join(filepath, 'config.json')))
-    } catch (error) {
+    } catch (_) {
       config = {}
     }
 

types/index.d.ts

@@ -0,0 +1,19 @@
+// Minimum TypeScript Version: 3.2
+
+import {Node} from 'unist'
+import {TOCOptions} from 'mdast-util-toc'
+
+declare namespace remarkToc {
+  type TOCSettings = Pick<TOCOptions, 'heading' | 'maxDepth' | 'tight' | 'skip'>;
+}
+
+/**
+ * Generate a Table of Contents.
+ *
+ * @param  settings configuration for generating the table of contents
+ */
+declare function remarkToc(
+  settings?: remarkToc.TOCSettings
+): (node: Node) => void
+
+export = remarkToc

types/remark-toc-tests.ts

@@ -0,0 +1,23 @@
+import remark = require('remark')
+
+import toc = require('remark-toc')
+
+remark().use(toc)
+
+remark().use(toc, {})
+
+remark().use(toc, {
+  heading: 'heading'
+})
+
+remark().use(toc, {
+  maxDepth: 2
+})
+
+remark().use(toc, {
+   tight: true
+})
+
+remark().use(toc, {
+   skip: 'skip-heading'
+})

types/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "lib": ["es2015"],
+    "strict": true,
+    "baseUrl": ".",
+    "paths": {
+      "remark-toc": ["index.d.ts"]
+    }
+  }
+}

types/tslint.json

@@ -0,0 +1,7 @@
+{
+  "extends": "dtslint/dtslint.json",
+  "rules": {
+    "semicolon": false,
+    "whitespace": false
+  }
+}