wvwasi

A WebView with WebAssembly System Interface (WASI) may be the best Javascript/WebAssembly runtime, and wvwasi is it.

                              |
Javascript/WebAssembly code   |  Javascript/WebAssembly application code
                              |                 |
                              |                 v
                              | WASI syscalls (inserted by compiler toolchain)
                              |                 |
------------------------------+                 |
                              |                 v
Javascript/WebAssembly runtime|    wvwasi (implementation WASI in webview)
(WebView)                     |                 |
                              |                 v
                              |        platform-specific calls
                              |

(Hence wvwasi isn't for making programs execute on WASI runtimes. That would either be a wasm32-wasi target complied by rust, or done through POSIX emulation by the Emscripten or wasi-sdk toolchains.)

WARNING: This is a alpha. Work in progress.

Example Usage

Currently only the Windows platform is implemented, other platforms are on the way. bash cargo run --example hello_world --target x86_64-pc-windows-msvc

API

The WASI API is versioned. This documentation is based on the WASI preview 1 snapshot. wvwasi implements the WASI system call API with the following additions/modifications:

System Calls

This section has been adapted from the official WASI API documentation.

• wvwasi.wasiSnapshotPreview1.fd_readdir()
• wvwasi.wasiSnapshotPreview1.path_remove_directory()
• wvwasi.wasiSnapshotPreview1.path_unlink_file()