feat(computedEager): deprecate computedEager

[ilyaliao]

Description

This PR deprecates computedEager, as since Vue 3.4 the built-in computed already avoids triggering dependents when the value is unchanged, and with VueUse v14 requiring Vue 3.5+, users can use the native computed directly.

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commit: 26fbb47

[benedictleejh]

I'm posting here as suggested by @9romise, and hopefully there can be a discussion on a way forward. To repost my comment from #4748:

I want to chime in a bit here regarding the behaviour of computedEager and computed. Vue's computed does not fully replace the behaviour of computedEager at the moment. computed is lazy, and the first computation is only be triggered when it is used, whether in the template or later in the script block, whereas computedEager is triggered immediately.

Is there a way for Vue's computed to be triggered immediately? Without it, I am unable to replace computedEager with computed. I am currently on Vue 3.5.22.

While Vue 3.4's computed may already avoid triggering dependents (and I'm sure some people were using computedEager to do so previously), as things currently stand, computed does not work as a complete replacement for the behaviour of computedEager due to the continued lazy evaluation of computed.

[OrbisK]

@ilyaliao we forgot to deprecate it in frontmatter 😄