Description

scanning currently starts multiple esbuild promises and there is no way to cancel them.

use a single pass promise and add a plugin that cancels the running build when calling cancel()

Additional context

this may be useful to prevent parallel runs of the optimizer too, ideally there was a simpler way to cancel the esbuild promise but i didn't see it :/

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.