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I have Eclipse (PDT) 2020-03 (4.15.0) installed with JSDT too.

I have an existing PHP project with JavaScript support enabled, but included ECMAScript libraries are stuck on version 3 (1999!!).

How can I change ECMAScript included version? Thank you!

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Upcoming Eclipse 2020-06 replaces old JSDT with WildWebDeveloper. This version fully support latest ECMA.

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