Fix [ERR_REQUIRE_ESM] error when importing hf_transformers

[JonaMX]

Fixes #2992

const transformers_1 = require("@xenova/transformers");
                       ^
Error [ERR_REQUIRE_ESM]: require() of ES Module .\node_modules\@xenova\transformers\src\transformers.js from .\node_modules\langchain\dist\embeddings\hf_transformers.cjs not supported.
Instead change the require of transformers.js in .\node_modules\langchain\dist\embeddings\hf_transformers.cjs to a dynamic import() which is available in all CommonJS modules.

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[jacoblee93]

Hey @JonaMX! Thanks for this and sorry for missing this issue for so long!

I've used an alternate fix involving a dynamic import from one of the other items in the thread. A bit less funky than running a function in a string. But it looks like it fixed it based on the CJS import test I added.

Will merge if it passes CI!

[jacoblee93]

Thank you for this!

[sgkadle]

Thank you for this @JonaMX

[SeanCannon]

@JonaMX is a hero among champions