Fix JS engines to use NODE_JS_TEST

[juj]

Emsdk generates

import os
emsdk_path = os.path.dirname(os.getenv('EM_CONFIG')).replace('\\', '/')
LLVM_ROOT = emsdk_path + '/llvm/git/build_main_64/bin'
NODE_JS = emsdk_path + '/node/22.16.0_64bit/bin/node'
EMSCRIPTEN_ROOT = emsdk_path + '/emscripten/main'
BINARYEN_ROOT = emsdk_path + '/binaryen/main_64bit_binaryen'
NODE_JS_TEST = ['qemu-s390x', '-L', '/usr/s390x-linux-gnu/', emsdk_path + '/node-big-endian-crosscompile/22.16.0_64bit/bin/node']

when activating regular and big endian node. This results in a non-working Emscripten installation that complains about NODE_JS not found.

Comment at #25063 (comment) suggests that the intent is that if NODE_JS_TEST is populated, it should go to JS_ENGINES, so make that happen.

[juj]

Test failures seem to be flakes.

Running this PR in http://localhost:8010/#/builders/11/builds/287 does seem to work as expected.

[sbc100]

Can you move these 2 lines to test/common.py after the assignment to NODE_JS_TEST (then you don't need the embedded if/else here).

[juj]

check

[juj]

There's some kind of type analysis checker?

mypy step fails with

test/common.py:142: error: List item 0 has incompatible type "Optional[Any]"; expected "List[str]"  [list-item]
Found 1 error in 1 file (checked 130 source files)

[juj]

Not sure if I did the change something wrong, though after moving the two lines, it seems the effect is as if I didn't have those lines at all, i.e. the run fails like it did before this PR altogether. (http://localhost:8010/api/v2/logs/33118/raw_inline)

[juj]

Oh I see, I still need the ternary, I misunderstood the move was intended to avoid that.

[juj]

(then you don't need the embedded if/else here).

Hmm, it looks like I do, because in common.py, the check is

if not config.NODE_JS_TEST:
  config.NODE_JS_TEST = config.NODE_JS

but in emsdk case, config.NODE_JS_TEST is set, it has both. So this check doesn't do anything.

So it needs

if not config.JS_ENGINES:
  config.JS_ENGINES = [config.NODE_JS_TEST if config.NODE_JS_TEST else config.NODE_JS]

[juj]

I reverted back to the original form, that helped the mypy type check, that insisted thinking that config.NODE_JS is Optional[Any] and not List[Str]

[sbc100]

lgtm, I'll try to move this code into test files later.