Require Node.js 8, add TypeScript definition (#2)

.gitattributes

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

.gitignore

@@ -1 +1,2 @@
 node_modules
+yarn.lock

.npmrc

@@ -0,0 +1 @@
+package-lock=false

.travis.yml

@@ -1,4 +1,5 @@
 language: node_js
 node_js:
-  - '6'
-  - '4'
+  - '12'
+  - '10'
+  - '8'

index.d.ts

@@ -0,0 +1,19 @@
+/**
+Check if your package was installed globally.
+
+@example
+```
+import isInstalledGlobally = require('is-installed-globally');
+
+// With `npm install your-package`
+console.log(isInstalledGlobally);
+//=> false
+
+// With `npm install --global your-package`
+console.log(isInstalledGlobally);
+//=> true
+```
+*/
+declare const isInstalledGlobally: boolean;
+
+export = isInstalledGlobally;

index.js

@@ -3,4 +3,6 @@ const fs = require('fs');
 const globalDirs = require('global-dirs');
 const isPathInside = require('is-path-inside');
 
-module.exports = isPathInside(__dirname, globalDirs.yarn.packages) || isPathInside(__dirname, fs.realpathSync(globalDirs.npm.packages));
+module.exports =
+	isPathInside(__dirname, globalDirs.yarn.packages) ||
+	isPathInside(__dirname, fs.realpathSync(globalDirs.npm.packages));

index.test-d.ts

@@ -0,0 +1,4 @@
+import {expectType} from 'tsd';
+import isInstalledGlobally = require('.');
+
+expectType<boolean>(isInstalledGlobally);

package.json

@@ -1,48 +1,53 @@
 {
-  "name": "is-installed-globally",
-  "version": "0.1.0",
-  "description": "Check if your package was installed globally",
-  "license": "MIT",
-  "repository": "sindresorhus/is-installed-globally",
-  "author": {
-    "name": "Sindre Sorhus",
-    "email": "[email protected]",
-    "url": "sindresorhus.com"
-  },
-  "engines": {
-    "node": ">=4"
-  },
-  "scripts": {
-    "test": "xo && ava"
-  },
-  "files": [
-    "index.js"
-  ],
-  "keywords": [
-    "global",
-    "package",
-    "globally",
-    "module",
-    "install",
-    "installed",
-    "npm",
-    "yarn",
-    "is",
-    "check",
-    "detect",
-    "local",
-    "locally",
-    "cli",
-    "bin",
-    "binary"
-  ],
-  "dependencies": {
-    "global-dirs": "^0.1.0",
-    "is-path-inside": "^1.0.0"
-  },
-  "devDependencies": {
-    "ava": "*",
-    "execa": "^0.7.0",
-    "xo": "*"
-  }
+	"name": "is-installed-globally",
+	"version": "0.1.0",
+	"description": "Check if your package was installed globally",
+	"license": "MIT",
+	"repository": "sindresorhus/is-installed-globally",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "[email protected]",
+		"url": "sindresorhus.com"
+	},
+	"engines": {
+		"node": ">=8"
+	},
+	"scripts": {
+		"test": "xo && ava && tsd"
+	},
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"keywords": [
+		"global",
+		"package",
+		"globally",
+		"module",
+		"install",
+		"installed",
+		"npm",
+		"yarn",
+		"is",
+		"check",
+		"detect",
+		"local",
+		"locally",
+		"cli",
+		"bin",
+		"binary"
+	],
+	"dependencies": {
+		"global-dirs": "^0.1.1",
+		"is-path-inside": "^2.1.0"
+	},
+	"devDependencies": {
+		"ava": "^1.4.1",
+		"cpy": "^7.2.0",
+		"del": "^4.1.0",
+		"execa": "^1.0.0",
+		"make-dir": "^3.0.0",
+		"tsd": "^0.7.2",
+		"xo": "^0.24.0"
+	}
 }

test.js

@@ -1,16 +1,46 @@
+import path from 'path';
 import test from 'ava';
 import execa from 'execa';
-import m from '.';
+import globalDirs from 'global-dirs';
+import del from 'del';
+import makeDir from 'make-dir';
+import cpy from 'cpy';
+/* eslint-disable import/extensions */
+import packageJson from './package.json';
+import fixturePackageJson from './fixture/package.json';
+/* eslint-enable import/extensions */
+import isInstalledGlobally from '.';
 
 test('local', t => {
-	t.false(m);
+	t.false(isInstalledGlobally);
 });
 
 test('global', async t => {
 	const npm = args => execa('npm', args, {cwd: 'fixture'});
 	await npm(['install', '--global', '.']);
 
+	const fixtureGlobalPath = path.join(
+		globalDirs.npm.packages,
+		fixturePackageJson.name
+	);
+	const isInstalledGloballyGlobalPathInFixture = path.join(
+		fixtureGlobalPath,
+		'node_modules',
+		packageJson.name
+	);
+	await del(fixtureGlobalPath, {force: true});
+	await makeDir(isInstalledGloballyGlobalPathInFixture);
+	await cpy(['./**/*'], fixtureGlobalPath, {
+		cwd: 'fixture',
+		followSymlinkedDirectories: false,
+		parents: true
+	});
+	await cpy(['./**/*'], isInstalledGloballyGlobalPathInFixture, {
+		followSymlinkedDirectories: false,
+		parents: true
+	});
+
 	t.is(await execa.stdout('is-installed-globally-fixture'), 'true');
 
-	await npm(['uninstall', '--global', '.']);
+	await del(fixtureGlobalPath, {force: true});
 });