From e550ce1dd34af3a6e1bcff7bbfa7b3a44013bc49 Mon Sep 17 00:00:00 2001
From: Dimitri Benin <BendingBender@users.noreply.github.com>
Date: Mon, 11 Mar 2019 05:39:16 +0000
Subject: [PATCH] Require Node.js 8, add TypeScript definition (#7)

---
 .gitattributes  |  3 +--
 .travis.yml     |  2 +-
 index.d.ts      | 12 ++++++++++++
 index.js        |  7 ++++++-
 index.test-d.ts |  4 ++++
 package.json    | 12 +++++++-----
 readme.md       |  2 +-
 test.js         |  4 ++--
 8 files changed, 34 insertions(+), 12 deletions(-)
 create mode 100644 index.d.ts
 create mode 100644 index.test-d.ts

diff --git a/.gitattributes b/.gitattributes
index 391f0a4..6313b56 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,2 +1 @@
-* text=auto
-*.js text eol=lf
+* text=auto eol=lf
diff --git a/.travis.yml b/.travis.yml
index e0cc348..f3fa8cd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
 language: node_js
 node_js:
+  - '10'
   - '8'
-  - '6'
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..c3b2c52
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,12 @@
+/**
+ * Check if your code is running as an [npm](https://docs.npmjs.com/misc/scripts) or [yarn](https://yarnpkg.com/lang/en/docs/cli/run/) script.
+ *
+ * @example
+ *
+ * import {isNpm} from 'isNpm';
+ *
+ * if (isNpm) {
+ * 	console.log('Running as a npm script!');
+ * }
+ */
+export const isNpm: boolean;
diff --git a/index.js b/index.js
index b5f3c27..b6293b1 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,9 @@
 'use strict';
-module.exports = 'npm_config_username' in process.env ||
+
+const isNpm =
+	'npm_config_username' in process.env ||
 	'npm_package_name' in process.env ||
 	'npm_config_heading' in process.env;
+
+// TODO: This named export should be replaced by a default export as soon as we move to ES modules
+exports.isNpm = isNpm;
diff --git a/index.test-d.ts b/index.test-d.ts
new file mode 100644
index 0000000..aaeff42
--- /dev/null
+++ b/index.test-d.ts
@@ -0,0 +1,4 @@
+import {expectType} from 'tsd-check';
+import {isNpm} from '.';
+
+expectType<boolean>(isNpm);
diff --git a/package.json b/package.json
index 9ba665f..4958315 100644
--- a/package.json
+++ b/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": [
 		"npm",
@@ -29,7 +30,8 @@
 		"script"
 	],
 	"devDependencies": {
-		"ava": "*",
-		"xo": "*"
+		"ava": "^1.3.1",
+		"tsd-check": "^0.3.0",
+		"xo": "^0.24.0"
 	}
 }
diff --git a/readme.md b/readme.md
index 12cd3c0..abe616e 100644
--- a/readme.md
+++ b/readme.md
@@ -13,7 +13,7 @@ $ npm install is-npm
 ## Usage
 
 ```js
-const isNpm = require('is-npm');
+const {isNpm} = require('is-npm');
 
 console.log(isNpm);
 ```
diff --git a/test.js b/test.js
index c138b01..7b0cf7a 100644
--- a/test.js
+++ b/test.js
@@ -1,6 +1,6 @@
 import test from 'ava';
-import m from '.';
+import {isNpm} from '.';
 
 test('main', t => {
-	t.true(m);
+	t.true(isNpm);
 });