fix: watch using rollup v4

[cbt1]

Motivation

Fixes #1471 , the issue where the watch flag in the build command does not pick up file changes. This also includes the serve command since it's using the same underlying code.

The root cause of this issue seem to be that the rollup-plugin-sourcemaps plugin has not updated to support Rollup v4, which has some changes to it's Plugin API (https://rollupjs.org/migration/#changes-to-the-plugin-api).

From the tests I've done Babel source maps works fine as a replacement.

There still seem to be some issue related to @rollup/plugin-commonjs where it can crash the build/watch process. But I'm not able to reproduce that consistently across the different nebula.js projects I've tested with. But this PR rollup/plugins#1639 seem to be the culprint of that crash at least. So using v26.0.3 should still work in those projects.

Requirements checklist

• Api specification
  • Ran yarn spec
    • No changes OR API changes has been formally approved
• Unit/Component test coverage
• Correct PR title for the changes (fix, chore, feat)

When build and tests have passed:

• Add code reviewers, for example @qlik-oss/nebula-core

[T-Wizard]

From the tests I've done Babel source maps works fine as a replacement.

have you tested that source maps from dependencies are loaded? and not just source map for the chart itself

[cbt1]

From the tests I've done Babel source maps works fine as a replacement.

have you tested that source maps from dependencies are loaded? and not just source map for the chart itself

Just did some testing and it appears that it fails to load the sourcemaps for dependencies. For now I think we have to live with that but ideally it should be solved as well.

[T-Wizard]

From the tests I've done Babel source maps works fine as a replacement.

have you tested that source maps from dependencies are loaded? and not just source map for the chart itself

Just did some testing and it appears that it fails to load the sourcemaps for dependencies. For now I think we have to live with that but ideally it should be solved as well.

we could try using rollup-plugin-sourcemaps2
https://www.npmjs.com/package/rollup-plugin-sourcemaps2
https://github.com/2wce/rollup-plugin-sourcemaps2
that should be a version rollup-plugin-sourcemaps updated to works with rollup 4.x.x or later.