fix: avoid type mismatch with Rollup (fix #7843)

[kachick]

Description

TS2430 appears when using skipLibCheck: false

I have some React projects. Sometimes I would like to configure skipLibCheck: false, however it makes errors only here.

fixes #7843

Additional context

Initially tried to merge original types more, but I've given up 🙇‍♂️

I don't have confident for below points.

• Wihch option should be preferred between strictNullChecks: true and strict: true in the tsconfig.check.json?
• Wihch prefix should be preferred between fix: and types: in the commit message?

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[sapphi-red]

It seems changing method (foo?(): void) to property (foo?: () => void) works.

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[kachick]

Wow thank you for letting me know!
Replacing it and adding isEntry passed the typecheck 🙏

However CI on macos looks failing 👀

[sapphi-red]

LGTM 👍

[kachick]

Thank you for review and merging 🙏