Add TypeScript definition (#11)

index.d.ts

@@ -0,0 +1,45 @@
+export interface Options {
+	/**
+	 * **Don't use this option unless you really have to!**
+	 *
+	 * Suffix appended to the project name to avoid name conflicts with native apps. Pass an empty string to disable it.
+	 *
+	 * @default 'nodejs'
+	 */
+	readonly suffix?: string;
+}
+
+export interface Paths {
+	/**
+	 * Directory for data files.
+	 */
+	readonly data: string;
+
+	/**
+	 * Directory for data files.
+	 */
+	readonly config: string;
+
+	/**
+	 * Directory for non-essential data files.
+	 */
+	readonly cache: string;
+
+	/**
+	 * Directory for log files.
+	 */
+	readonly log: string;
+
+	/**
+	 * Directory for temporary files.
+	 */
+	readonly temp: string;
+}
+
+/**
+ * Get paths for storing things like data, config, cache, etc.
+ *
+ * @param name - Name of your project. Used to generate the paths.
+ * @returns The paths to use for your project on current OS.
+ */
+export default function envPaths(name: string, options?: Options): Paths;

index.js

@@ -46,7 +46,7 @@ const linux = name => {
 	};
 };
 
-module.exports = (name, options) => {
+const envPaths = (name, options) => {
 	if (typeof name !== 'string') {
 		throw new TypeError(`Expected string, got ${typeof name}`);
 	}
@@ -68,3 +68,6 @@ module.exports = (name, options) => {
 
 	return linux(name);
 };
+
+module.exports = envPaths;
+module.exports.default = envPaths;

index.test-d.ts

@@ -0,0 +1,13 @@
+import {expectType} from 'tsd-check';
+import envPaths, {Paths} from '.';
+
+expectType<Paths>(envPaths('MyApp'));
+expectType<Paths>(envPaths('MyApp', {suffix: 'test'}));
+
+const paths = envPaths('MyApp');
+
+expectType<string>(paths.cache);
+expectType<string>(paths.config);
+expectType<string>(paths.data);
+expectType<string>(paths.log);
+expectType<string>(paths.temp);

package.json

@@ -13,10 +13,11 @@
 		"node": ">=6"
 	},
 	"scripts": {
-		"test": "xo && ava"
+		"test": "xo && ava && tsd-check"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"common",
@@ -37,7 +38,8 @@
 		"unix"
 	],
 	"devDependencies": {
-		"ava": "^0.25.0",
-		"xo": "^0.23.0"
+		"ava": "^1.2.1",
+		"tsd-check": "^0.3.0",
+		"xo": "^0.24.0"
 	}
 }

readme.md

@@ -16,6 +16,7 @@ $ npm install env-paths
 
 ```js
 const envPaths = require('env-paths');
+
 const paths = envPaths('MyApp');
 
 paths.data;