Garbage Collection (WASM GC)

WebAssembly GC (WASM GC) is a proposal to add garbage-collected memory management to WebAssembly. It enables languages like Kotlin, Dart, and OCaml to compile to efficient WASM.

Current State

Without WASM GC, languages must:

• Use manual memory management (Rust)
• Bundle a full GC runtime (large binary size)
• Use linear memory with manual allocation (complex)

When to Use WASM GC

Use WASM GC when:

• Compiling GC languages to WASM
• Handling complex object graphs
• Prioritizing developer experience
• Porting existing JVM/Flutter code

Browser Support

Feature	Chrome	Firefox	Safari	Edge
WASM GC	119+	119+	Experimental	119+

TIP

Enable experimental flags if needed, check support with WebAssembly.validate().

Framework Support

Flutter Web with WASM GC

// Dart/Flutter Web app
// Benefits from WASM GC:
import 'dart:ui' as ui;

// Efficient object management
// Smaller bundle size than JS
// Near-native performance

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Continue learning WASI Standard.