Add types

package.json

@@ -30,12 +30,15 @@
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
   "files": [
-    "index.js"
+    "index.js",
+    "types/index.d.ts"
   ],
+  "types": "types/index.d.ts",
   "dependencies": {
     "unist-util-is": "^4.0.0"
   },
   "devDependencies": {
+    "dtslint": "^4.0.0",
     "nyc": "^15.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
@@ -48,7 +51,8 @@
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
     "test-api": "node test",
     "test-coverage": "nyc --reporter lcov tape test.js",
-    "test": "npm run format && npm run test-coverage"
+    "test-types": "dtslint types",
+    "test": "npm run format && npm run test-coverage && npm run test-types"
   },
   "nyc": {
     "check-coverage": true,

types/index.d.ts

@@ -0,0 +1,33 @@
+// TypeScript Version: 3.5
+
+import {Node} from 'unist'
+import {Test} from 'unist-util-is'
+
+export interface RemoveOptions {
+  /**
+   * Whether to drop parent nodes if they had children, but all their children were filtered out test
+   */
+  cascade?: boolean
+}
+
+/**
+ *
+ * Mutate the given tree by removing all nodes that pass test. The tree is walked in preorder (NLR), visiting the node itself, then its head, etc.
+ *
+ * @param tree      Tree to filter
+ * @param test      is-compatible test (such as a type)
+ */
+export function remove<T extends Node>(tree: T, test?: Test<Node>): T | null
+/**
+ *
+ * Mutate the given tree by removing all nodes that pass test. The tree is walked in preorder (NLR), visiting the node itself, then its head, etc.
+ *
+ * @param tree      Tree to filter
+ * @param options   Whether to drop parent nodes if they had children, but all their children were filtered out. Default is {cascade: true}
+ * @param test      is-compatible test (such as a type)
+ */
+export function remove<T extends Node>(
+  tree: T,
+  options?: RemoveOptions,
+  test?: Test<Node>
+): T | null

types/test.ts

@@ -0,0 +1,19 @@
+import {remove} from 'uninst-util-remove';
+import * as u from 'unist-builder';
+
+const tree = u('root', [
+  u('leaf', '1'),
+  u('node', [
+    u('leaf', '2'),
+    u('node', [u('leaf', '3'), u('other', '4')]),
+    u('node', [u('leaf', '5')])
+  ]),
+  u('leaf', '6')
+]);
+
+remove()          // $ExpectError
+remove('leaf')    // $ExpectError
+
+remove(tree)
+remove(tree, 'leaf');
+remove(tree, {cascade: false}, 'leaf');

types/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "module": "es2015",
+    "lib": ["es2015"],
+    "moduleResolution": "node",
+    "strict": true,
+    "noEmit": true,
+    "baseUrl": ".",
+    "paths": {
+      "uninst-util-remove": ["."]
+    }
+  }
+}
+

types/tslint.json

@@ -0,0 +1,9 @@
+{
+  "extends": "dtslint/dtslint.json",
+  "rules": {
+    "no-redundant-jsdoc": false,
+    "no-redundant-jsdoc-2": true,
+    "semicolon": false,
+    "whitespace": false
+  }
+}