fix(types): add type declarations to package

[ngoclong19]

Pull Request check-list

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• Does npm run test pass with this change (including linting)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
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Description of change

Close #1183.

Build package locally with npm pack, then test with VS Code.
Types were probably hinted.

[WikiRik]

Thanks!

[github-actions]

🎉 This PR is included in version 6.5.2 🎉

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