[Feature]: Add support for "metafile" esbuild option

[patryk-smc]

What area(s) will this request affect?

App, Extension

What type of change do you want to see?

Substantial change to existing feature

Overview

Metafiles are useful for analyzing esbuild bundles. It would be nice to be able to have them generated automatically when running shopify app build or with a cli flag, so they can be uploaded to esbuild bundle analyzer.

Motivation

Reducing bundle size of UI extensions for better performance.

[frandiox]

Hi 👋

Are you using the Remix template with Vite? If so, Vite uses Rollup for bundling instead of ESBuild, so it can't generate an ESBuild metafile by default. For now, you can try with this Rollup/Vite plugin to get something similar: https://github.com/btd/rollup-plugin-visualizer

[patryk-smc]

Hi @frandiox , no I don't use Remix template. I only need it for extensions, which looking at the CLI source are built with esbuild.

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