emacs - What does "extern" mean in JavaScript? -


i started use js2-mode in emacs, , found variables js2-global-externs , js2-additional-externs. doc string says "a list of extern names you'd consider declared."

i don't understand "extern" means here. knew "extern" keyword in c, started discover "extern" means. searched javascript extern/ecma-262 extern/web browser extern didn't looked promising. can point me in right direction?

the extern keyword has nothing javascript. it's configuration on js2-mode relies on define language.

for instance, believe add own global variables js2-global-externs recognized.

have @ file https://code.google.com/p/js2-mode/source/browse/trunk/js2-externs.el?r=57


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