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How about
options.env ?= Object.create(process.env)
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I saw that in the bufferedNodeProcess code, but for some reason, Object.create(process.env) returns an empty object when I use it here.
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It doesn't return an empty object, it just moves stuff to the prototype. You might not see it in the debugger at top level but it's still there.
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Wow can't believe I didn't know that... So I looked more into Object.create and an interesting thing about it is that the properties created are not writable, enumerable or configurable by default