fix: override only existing searchParams

[jbroma]

Summary

Part of #1480

When implementing Module Federation for Metro, we're reusing existing lazy bundling for production bundles, and we wanted to clean up the bundlePaths for the production bundles by not adding any query params to it. Since the searchParams are entirely based on sourceUrl, we can avoid adding searchParams by having a clean sourceUrl.

This PR does two things:

• - it makes the override of runModule & modulesOnly params happen only when those params are present
• - prevents adding ? to the URL when there are no searchParams

Changelog: [Fix] Only override existing runModule & modulesOnly search params when processing bundle async paths

Note

Marking this as fix since the spec mentions overriding params and not setting them

Test plan

• - existing tests pass

[vzaidman]

Hey!
When spec mentions overriding params and not setting them?

[jbroma]

hey @vzaidman 👋, I've taken that from here:

metro/packages/metro/src/DeltaBundler/Serializers/helpers/__tests__/js-test.js

Line 179 in 6f0093c

test('async bundle paths override modulesOnly and runModule', () => {

(although that might have been an over-interpretation on my side 😅)