Create a bundle for browsers that includes the Wasm code?

Suggestion: source-map would be easier to use if it completely hid the fact that it internally uses Wasm.

• For browsers, you can do that by distributing a bundle, as shown below.
• For Node.js, this should be even simpler.

webpack.config.js:

const path = require('path');

module.exports = {
  // ···
  module: {
    rules: [
      {
        test: /\.wasm$/,
        type: 'javascript/auto',
        loader: 'arraybuffer-loader', // installed via npm
      },    
    ],
  },
};

Setup code (when used outside the library):

import arrayBuffer from 'source-map/lib/mappings.wasm';
SourceMapConsumer.initialize({
  'lib/mappings.wasm': arrayBuffer,
});

AFAICT, .initialize() is not in the .d.ts file. Maybe add it?

Start with the proposed webpack.config.js and the browser setup using lib/mappings.wasm, then inspect the TypeScript declaration file for SourceMapConsumer.initialize(). Define the browser bundle and Node.js behavior, and update the declarations if appropriate; done means consumers can use the Wasm implementation without exposing its setup details.