A question about how EMCC implements WASI

Hi,

There is a question about how emcc implements WASI. I think that under normal circumstances, it should invoke the WASI APIs’ implementation and import the corresponding wasi function in the target wasm file like wasi-sdk, but after testing case using system API like file system api fopen, I found that it is different with EMCC. I notice that someone has submitted similar test case here [#12094](https://github.com/emscripten-core/emscripten/issues/12094) so I do not attach mine.

In the meanwhile, I also notice that there are tutorials about using files in [emscripten.org](https://emscripten.org/docs/getting_started/Tutorial.html#using-files ) , so does it mean that emcc's implementation about WASI relys on browser or nodejs Api, which is different from the traditional wasi-sdk by invoking wasi api? Is there any possible way to compile wasm module of standard wasi with emcc?

Looking forward to your reply.

Thanks