Statistics show that the typical Singaporean makes around $4,563 a month (median income as of November 2019). Does this include bonuses? Or just the basic salary?

This definition could used for the computation of median household income:

Gross monthly income ... refers to the gross monthly wages or salaries before deduction of employee CPF contributions and personal income tax. It comprises basic wages, overtime pay, commissions, tips, other allowances and one-twelfth of annual bonuses.

https://stats.mom.gov.sg/Pages/Income-Summary-T...