From 26 April 2022, 0001 hours, fully vaccinated travellers travelling from Taiwan to Singapore will no longer be required to undergo Pre-Departure Testing before departing for Singapore. More details on the latest changes can be found here: https://www.moh.gov.sg/news-highlights/details/further-easing-of-community-and-border-measures
Travellers are also advised to visit the SafeTravel website at https://safetravel.ica.gov.sg/arriving/overview to check on the latest border measures before your departure to Singapore.