A tool to publish sourcemaps externally and rewrite sourcemap URLs at pre-publish time.

npm i -D sourcemap-publisher

npx sourcemap-publisher --provenance

This will do the following:

• Load the files in your files array in package.json
• Find the sourcemaps any of these files reference
• Package up these sourcemaps under {packageName}@{version}-sourcemaps
• Rewrite the sourcemap URLs in the original sources to point at a CDN for this sourcemap package

You should run this command after your build, but before you publish.

It is important to get the ordering right so you do not overwrite the rewritten sourcemap URLs.

Generally, the order should be as follows:

• Build your package
• Run sourcemap-publisher to publish the sourcemaps and rewrite the URLs
• Run npm publish to publish the rewritten sources

You can achieve this through a prepublishOnly script in your package.json:

{
  "scripts": {
    "prepublishOnly": "npm run build && sourcemap-publisher --provenance"
  }
}

MIT