[wasm] Fix "_scriptDir not defined" error when used in webworker #4528
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I couldn't find a more elegant solution using the --pre-js approach.. Inspired by emscripten-core/emscripten#12832, I manually update the if check for _scriptDir to make it work for both non-webworker case (where _scriptDir is defined) and webworker case (where _scriptDir is not defined).
I also tried to use document.currentScript.src instead of undefined for _scriptDir, but document.currentScript.src will return the location of the user script instead of the original location where the tfjs npm package is imported.
Please let me know if you guys any better ideas.
This change is