transpile to ES5

[Uttu316]

I am building a utility library with Vite+typescript.

How can I enable the build configuration to produce an ES5 build? Currently, it is producing an ES2015 build.

is there any promising way to do enable this feature?

I have explored:

• SWC can do this, but no documentation to enable this.
• @vitejs/plugin-legacy, but it seems unreliable because it does not support lib mode
• babel, the last option is to integrate Babel to generate ES5 transpired build

The Babel works but has not been found to support polyfills. Is there a better way, or is there a workaround for SWC?

What is the best way to do this task?