Require Node.js 8, add TypeScript definition (#4)

.gitattributes

@@ -1,2 +1 @@
-* text=auto
-*.js text eol=lf
+* text=auto eol=lf

.travis.yml

@@ -1,4 +1,4 @@
 language: node_js
 node_js:
+  - '10'
   - '8'
-  - '6'

index.d.ts

@@ -0,0 +1,11 @@
+/// <reference types="node"/>
+import {Readable as ReadableStream} from 'stream';
+
+/**
+ * Convert a `string`/`Buffer`/`Uint8Array` to a [readable stream](https://nodejs.org/api/stream.html#stream_readable_streams).
+ *
+ * @param input - Value to convert to a stream.
+ */
+export default function toReadableStream(
+	input: string | Buffer | Uint8Array
+): ReadableStream;

index.js

@@ -1,11 +1,14 @@
 'use strict';
 const {Readable: ReadableStream} = require('stream');
 
-module.exports = input => (
+const toReadableStream = input => (
 	new ReadableStream({
 		read() {
 			this.push(input);
 			this.push(null);
 		}
 	})
 );
+
+module.exports = toReadableStream;
+module.exports.default = toReadableStream;

index.test-d.ts

@@ -0,0 +1,7 @@
+import toReadableStream from '.';
+
+toReadableStream('🦄🌈').pipe(process.stdout);
+toReadableStream(Buffer.from('🦄🌈')).pipe(process.stdout);
+toReadableStream(new Uint8Array(Buffer.from('🦄🌈').buffer)).pipe(
+	process.stdout
+);

package.json

@@ -10,13 +10,14 @@
 		"url": "sindresorhus.com"
 	},
 	"engines": {
-		"node": ">=6"
+		"node": ">=8"
 	},
 	"scripts": {
-		"test": "xo && ava"
+		"test": "xo && ava && tsd-check"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"stream",
@@ -33,8 +34,9 @@
 		"pull"
 	],
 	"devDependencies": {
-		"ava": "*",
-		"get-stream": "^3.0.0",
-		"xo": "*"
+		"ava": "^1.3.1",
+		"get-stream": "^4.1.0",
+		"tsd-check": "^0.3.0",
+		"xo": "^0.24.0"
 	}
 }