fix(useFetch): return PromiseLike after setting method

[tobyzerner]

Description

This fixes an oversight where if you call any of the method-setting methods (post, patch, etc.), the return value is not PromiseLike as the typings would suggest.

useFetch('http://example.com').post({ foo: 'bar' }).then(() => {}) // undefined is not a function

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines.
• 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.

[okxiaoliang4]

maybe like this

Suggested change

	} as any
	} as UseFetchReturn<T> & PromiseLike<UseFetchReturn<T>>

[tobyzerner]

Yeah fair suggestion, I just copied the implementation of setType below :) https://github.com/vueuse/vueuse/blob/main/packages/core/useFetch/index.ts#L508