Error when running on Node v18 due to native fetch

[duhdugg]

Description
Error when running source-map-explorer on Node v18 due to native fetch

You must provide the URL of lib/mappings.wasm by calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using SourceMapConsumer

Steps to reproduce

1. Use Node v18
2. Try running source-map-explorer on a previously working project

Environment

• Node: v18+
• source-map-explorer Version: 2.5.2

Additional context

Workaround: add NODE_OPTIONS='--no-experimental-fetch' environment variable when running source-map-explorer