misc/wasm: make wasm_exec more robust against uncommon environments
JavaScript environments are quite unpredictable because bundlers add
mocks for compatibility and libraries can polute the global namespace.
Detect more of such situations:
- Add check that require("fs") returns an object.
- Fix check that require("fs") returns an non-empty object.
- Add check that "module" is defined.
Fixes #40730
Change-Id: I2ce65fc7db64bbbb0b60eec79a4cfe5c3fec99c0
Reviewed-on: https://go-review.googlesource.com/c/go/+/248758
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>