Wasm code also can't access the native system level stuff - so, no filesystem access, no kernel APIs, etc. Wasm compilers solve it for you - but usually by adding a big chunk of generated JS.īetween that and the VM slowdown, the code I've been working with lately, wasm ends up about 3x slower than when I just run it natively. Even just moving data across the wasm-to-javascript divide is a hassle. All of this stuff is (currently) way more awkward from wasm. So, you can create native javascript objects from native code, attach custom (hidden) properties to existing JS objects, interact with the prototype chain, create promises, make native functions which call C directly, etc. It allows you talk to V8 & interact with javascript objects directly. Napi (node js's native api) is a much richer API. Usage Transcoding a file upload streamĮxample using stream-body-parser.js const express = require( 'express')Ĭonst StreamBodyParser = require( 'stream-body-parser')Ĭonst Transcoder = require( 'stream-transcoder')Ĭonst bodyParser = new StreamBodyParser(app)īodyParser.I had a back and forth with some node developers on github a few years ago about this. Make sure you install it locally or use a package that provides it (e.g. TypeScript types are included in the package.įFmpeg is not installed with this package. FFmpeg based media transcoder that supports streams.įorked from the original repo since it's not maintained.
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