postMinifyProcess and postProcessBundleSourcemap not working

[devattendant]

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
The documentation at https://facebook.github.io/metro/docs/en/configuration lists two parameters postMinifyProcess and postProcessBundleSourcemap which I both tried to use to hook into bundle creation. While both are documented, they are actually not implemented.

I have added calling postProcessBundleSourcemap in metro/src/server.js to get it working at least temporarily but I failed to get postMinifyProcess working as it is deleted from the config after a short time and not passed to the transformer, even if I remove the deletion at metro/src/DeltaBundler/Transformer.js.

If the current behavior is a bug, please provide the steps to reproduce and a minimal repository on GitHub that we can yarn install and yarn test.
I've modified metro.config.js like the following, but there is no output:
module.exports = { resetCache: true, transformer: { getTransformOptions: async () => ({ transform: { experimentalImportSupport: false, inlineRequires: false, }, }), minifierPath: 'metro-minify-terser', postMinifyProcess: ({ code, map }) => { console.log("postMinifyProcess") return { code, map }; } } };

What is the expected behavior?
Both postMinifyProcess and postProcessBundleSourcemap should be called or removed in documentation.

Please provide your exact Metro configuration and mention your Metro, node, yarn/npm version and operating system.
Metro 0.51.1, RN 0.59.5, metro.config.js see above.

[TheHighriser]

Same problem here. Still not working. Is there anything working in the Serializer config?

[dominikfoldi]

We are building a JavaScript code optimizer and we want to create a Metro plugin which would be a good fit as the postMinifyProcess or postProcessBundleSourcemap. It is really not implemented why is it the case?

[vividh]

👍
Please implement this!

[EmilijusS]

Still not working.