relative #include "" directives are treated with respect to $EMSCRIPTEN/src

[juj]

liba.js

#include "libb.js"

libb.js

mergeInto(LibraryManager.library, {
  printey: function() {
    Module.print('Hello!');
  }
});

Command line: emcc tests/hello_world.c --js-library liba.js -o a.html

Will fail with error

Error: ENOENT: no such file or directory, open 'C:\code\emsdk\emscripten\incoming\src\libb.js'

I wonder if it would be good idea to make #include "foo.js" be treated with respect to the current file, and #include <foo.js> with respect to $EMSCRIPTEN/src?

[juj]

(or just even not adding angle brackets support, I think the relative to current file handling should be enough for all current use cases)

[stale]

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