ClojureScript Is Not An Island: Integrating Node Modules

Re:ClojureScript Is Not An Island: Integrating Node Modules by sjrd on Wednesday July 12, 2017 @06:40PM (#14757295)

That's a surprisingly positive result. Usually I expect most JavaScript libraries to be destroyed by Closure's Advanced optimizations, unless they've been written specifically with Closure in mind (which they're not).

Anyway, congrats on those features :-) Scala.js doesn't do the part where Closure is applied on JS dependencies; it's only applied to Scala.js code (though with the advantage that we never need any externs).

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Re:ClojureScript Is Not An Island: Integrating Node Modules by Scarbutt on Wednesday July 12, 2017 @07:25PM (#14757547)

how does interop works in scalajs without externs?

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Re:ClojureScript Is Not An Island: Integrating Node Modules by sjrd on Thursday July 13, 2017 @12:23AM (#14758681)

The Scala.js compiler, thanks to its static types, precisely knows which property accesses refer to "internal" properties (defined in Scala code, which can be renamed) and which ones refer to external JavaScript code (which cannot). It then simply always emit the former using dot notation (foo.bar) and the latter with bracket notation (foo["bar"]). This allows Closure to rename all internal property accesses but not external property accesses.

It's even slightly more powerful than using externs: if you use the same property name both in internal accesses and external ones, Scala.js can rename the former without touching the latter. An externs-based solution won't be allowed to rename the internal accesses.

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