fix(prefetch-sw): only prefetch direct imports

[wmertens]

• use prefetch sw with docs

It was adding dynamic imports, which is not correct. Those should be handled by Link prefetching and Insights.

Furthermore, the graph is reduced by not including dependencies that other dependencies already import.

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Latest commit: da895f66ef8a3a2ea50893c9d4250e2139da7c3f

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| Name | Type | | --------------------- | ----- | | @builder.io/qwik | Patch | | eslint-plugin-qwik | Patch | | @builder.io/qwik-city | Patch | | create-qwik | Patch |

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[wmertens]

@mhevery We can differentiate imports, handlers, segments, and dynamic imports. We can differentiate by negative numbers indicating the type of what follows, -1 handlers, -2 segments, -3 dynamic.

Alternatively, Qwik loader can just tell us which handlers are actually on the page and those then get fetched opportunistically, no differentiation needed, only direct imports. What do you think?

🤔 Or indeed any dynamically imported segments that are not handlers are likely to be tasks etc.

Ah and we can sort by module size, should we fetch big or small modules first?

Not for this PR, but the prefetch SW is also missing:

• limit concurrent downloads
• clear speculative fetches on navigation
• a way for qwik city to declare a path-to-imports mapping for link prefetching. I'm thinking qwik-city extends the manifest with paths and their imports.
• support for insights

[wmertens]

@mhevery I now detect tasks (by the fact that they also export _hW) and fetch them with lower priority. Other dynamic imports are left up to the qprefetch events.

WDYT?