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version_52: Add pass to minify import and export names (#1719)

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@kripken kripken released this 02 Nov 02:58
version_52
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Learn about vigilant mode. 
This new pass minifies import and export names, for example, this may minify

   (import "env" "longname" (func $internal))
to

   (import "env" "a" (func $internal))
By updating the JS that provides those imports/calls those exports, we can use the minified names properly. This can save a useful amount of space in the wasm and JS, see kripken/emscripten#7414
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