WASM Sourcemaps

Sourcemaps provide a working path to step-through debugging in Web Assembly code, but with a caveat:

The interface for execution of Web Assembly is

WebAssembly.instantiate(bufferSource, importObject);

Where the module is provided as a byte buffer, divorced from it's provinance, of where the source was loaded from. As such, there's no way for relative source maps to be loaded, since the browser cannot connect what such a URL is relative to.

This module allows runtime re-writing of the source code link to address this annoyance.

Usage

const wasmmap = require('wasm-sourcemap');
bufferSource = wasmmap.SetSourceMapURLRelativeTo(
    bufferSource,
    window.location.href);

API

• GetSourceMapURL returns the URL set as the sourcemap URL for a buffer, if set.
• RemoveSourceMapURL returns a stripped version of a WASM buffer stripped of its sourcemap URL section, if present.
• SetSourceMapURL returns an updated version of a WASM buffer with its sourcemap URL updated to a provided absolute URL.
• SetSourceMapURLRelativeTo returns an updated version of a WASM buffer with its sourcemap URL updated to an absolute URL relative to a provided URL.