Add types

package.json

@@ -20,19 +20,22 @@
     "type": "opencollective",
     "url": "https://opencollective.com/unified"
   },
+  "types": "types/index.d.ts",
   "author": "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
   "contributors": [
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
   "main": "index.js",
   "files": [
     "index.js",
-    "convert.js"
+    "convert.js",
+    "types/index.d.ts"
   ],
   "dependencies": {
     "vfile": "^4.0.0"
   },
   "devDependencies": {
+    "dtslint": "^4.0.6",
     "nyc": "^15.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
@@ -45,7 +48,8 @@
     "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 +1,54 @@
+// TypeScript Version: 3.7
+
+import {VFile, VFileCompatible, VFileOptions} from 'vfile'
+
+export = rename
+
+/**
+ * Renames the given `file` with `renames`
+ * @param file VFile to rename
+ * @param renames Rename instructions
+ * @returns The renamed `file`
+ */
+declare function rename(file?: VFileCompatible, renames?: rename.Renames): VFile
+
+declare namespace rename {
+  interface SpecAffix {
+    prefix?: string
+    suffix?: string
+  }
+
+  /**
+   * A spec is an object describing path properties to values.
+   * For each property in spec, if its value is string, the value of the path property on the given file is set.
+   * If the value is object, it can have a prefix or suffix key, the value of the path property on the given file is prefixed and/or suffixed.
+   */
+  interface Spec {
+    path?: VFileOptions['path'] | SpecAffix
+    basename?: VFileOptions['basename'] | SpecAffix
+    stem?: VFileOptions['stem'] | SpecAffix
+    extname?: VFileOptions['extname'] | SpecAffix
+    dirname?: VFileOptions['dirname'] | SpecAffix
+  }
+
+  /**
+   * When given something, returns a vfile from that, and changes its path properties.
+   * - If there is no bound rename (it’s null or undefined), makes sure file is a VFile
+   * - If the bound rename is a normal string starting with a dot (.), sets file.extname
+   * - Otherwise, if the bound rename is a normal string, sets file.basename
+   * - If the bound test is an array, all renames in it are performed
+   * - Otherwise, if the bound rename is an object, renames according to the Spec
+   * @param file VFile to rename
+   * @returns The renamed `file`
+   */
+  type Move = (file: VFile) => VFile
+
+  type Renames = string | Move | Spec | Renames[]
+
+  /**
+   * Create a function (the [move](https://github.com/vfile/vfile-rename#movefile)) from `renames`, that when given a file changes its path properties.
+   * @param renames Rename instructions
+   * @returns A [move](https://github.com/vfile/vfile-rename#movefile)
+   */
+  function convert(renames: Renames): Move
+}

types/tsconfig.json

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

types/tslint.json

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

types/vfile-rename-tests.ts

@@ -0,0 +1,28 @@
+import vfile = require('vfile')
+import rename = require('vfile-rename')
+
+const convert = rename.convert
+const move = convert('!')
+const file = vfile('index.js')
+
+rename() // $ExpectType VFile
+rename('!') // $ExpectType VFile
+rename({path: '/'}) // $ExpectType VFile
+rename(file, 'main.js') // $ExpectType VFile
+rename(file, move) // $ExpectType VFile
+rename(file, {stem: 'main'}) // $ExpectType VFile
+rename(file, {stem: 'readme', extname: '.md'}) // $ExpectType VFile
+rename(file, {stem: {suffix: '-1'}, dirname: {prefix: 'an-'}}) // $ExpectType VFile
+rename(file, ['readme.htm', {stem: 'index', extname: {suffix: 'l'}}]) // $ExpectType VFile
+rename(file, 1) // $ExpectError
+rename(file, {other: '!'}) // $ExpectError
+
+convert('!') // $ExpectType Move
+convert({path: '/'}) // $ExpectType Move
+convert(move) // $ExpectType Move
+convert({stem: 'main'}) // $ExpectType Move
+convert({stem: 'readme', extname: '.md'}) // $ExpectType Move
+convert({stem: {suffix: '-1'}, dirname: {prefix: 'an-'}}) // $ExpectType Move
+convert(['readme.htm', {stem: 'index', extname: {suffix: 'l'}}]) // $ExpectType Move
+convert(1) // $ExpectError
+convert({other: '!'}) // $ExpectError