browser-support-polyfills.mdx

title	description	canonical
Browser Support & Polyfills	Note on browser support in ReScript	/docs/manual/v11.0.0/browser-support-polyfills

Browser Support & Polyfills

ReScript compiles to JavaScript ES5, with the exception of optionally allowing to compile to ES6's module import & export.

For old browsers, you also need to polyfill TypedArray. The following standard library functions require it:

• Int64.float_of_bits
• Int64.bits_of_float
• Int32.float_of_bits
• Int32.bits_of_float

If you don't use these functions, you're fine. Otherwise, it'll be a runtime failure.