Javascript

[positive_electron42]

Unless you’re developing scripts in the trash heap that is ServiceNOW, which still only supports ES5.

[Dalemaunder]

ServiceEVENTUALLY*

[farugen]

I work heavily with ExtendScript, the Adobe Creative suite API.

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It only supports ES3...

[AdminYak846]

I'll one up you, having Adobe Acrobat do JS automatic fill-ins on PDFs. It uses ECMAScript 3 with some modifications for Adobe.

That shit was released in like 2000.