Add isLinux helper

helpers/environment.js

@@ -5,11 +5,37 @@ export function isNuxt( VueThis ) {
     return has( VueThis, [ '$nuxt' ])
 }
 
+export function isBrowserContext () {
+    if ( typeof navigator === 'undefined' ) return false
+
+    return true
+}
+
+export function hasProcesGlobal () {
+    if ( typeof process === 'undefined' ) return false
+
+    return true
+}
+
+
 // https://stackoverflow.com/a/8684009/1397641
 export function isDarwin () {
-    if ( typeof navigator !== 'undefined' ) return false
+    if ( isBrowserContext() ) return false
 
-    if ( typeof process === 'undefined' ) return false
+    if ( !hasProcesGlobal() ) return false
 
     return process.platform === 'darwin'
 }
+
+
+export function isLinux () {
+    if ( isBrowserContext() ) return false
+
+    if ( !hasProcesGlobal() ) return false
+
+    if ( process.platform === 'linux' ) return true
+
+    if ( process.platform === 'openbsd' ) return true
+
+    return false
+}