Support bundle and bundleAsync APIs in wasm builds #583
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Faster to run wasm-opt on the smaller file.
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Fixes #277
This uses Emscripten/Binaryen's Asyncify transform to allow synchronous WASM code to call asynchronous JavaScript code. That way a custom resolver can be passed in to read files. That avoids it needing to be multithreaded, which is complicated in WASM (without WASI). The node flavor has a default resolver that reads files using node's filesystem. The browser version will require a custom resolver to be passed in.