Flutter Web: BigInt

Avoiding precision loss in the browser.

Flutter Web compiles to JavaScript, which means it shares the same 64-bit float limitations as any other JS application.

The Problem

If you parse a large Memo ID (near 18,446,744,073,709,551,615) as an int in Dart when running on Web, you will lose precision.

The Solution

The Dart package uses BigInt internally and returns the routingId as a String.

Never convert the routingId to an int if your app targets Web. Always keep it as a String or a BigInt.