Issues

• Missing SIMD shift instructions by non-scalar amounts

  simd
  WebAssembly/design#1586 · Filter by author Vanilagy opened on Jun 4, 2026
  6

• JS Builtins general opt-in via builtins: ['js']

  JS embedding
  WebAssembly/design#1585 · Filter by author guybedford opened on May 29, 2026

• JS builtin naming guidelines

  JS embedding
  WebAssembly/design#1584 · Filter by author eqrion opened on May 21, 2026
  20

• Limit on string lengths (for import names etc)

  imports/exports
  WebAssembly/design#1582 · Filter by author jakobkummerow opened on Apr 1, 2026
  2

• Stack pointer overflow detection

  integerlinear memory
  WebAssembly/design#1580 · Filter by author elasota opened on Mar 4, 2026

• Single binary for multithreaded and singlethreaded code

  documentationthreads
  WebAssembly/design#1576 · Filter by author eugeneko opened on Oct 24, 2025

• A fine-grained JIT Interface: func.new bytecode

  dynamic optimization
  WebAssembly/design#1573 · Filter by author titzer opened on Sep 23, 2025
  29

• Sparse memory

  linear memory
  WebAssembly/design#1571 · Filter by author DemiMarie opened on Sep 16, 2025
  1

• Multibyte Access to Array i8

  managed objects
  WebAssembly/design#1569 · Filter by author brendandahl opened on Jul 9, 2025
  21

• Proposal idea: adding must_throw signature

  exception handling
  WebAssembly/design#1564 · Filter by author carlopi opened on Jun 5, 2025
  9

• Custom annotations on functions

  text format
  WebAssembly/design#1563 · Filter by author kripken opened on May 13, 2025
  18

• 1-byte small local.get would save significant bundle size in real-world code

  binary format
  WebAssembly/design#1560 · Filter by author dead-claudia opened on Apr 25, 2025
  9

• The current sparse encoding of shuffles blows up code size in graphics-heavy and audio-heavy code

  binary formatsimd
  WebAssembly/design#1559 · Filter by author dead-claudia opened on Apr 23, 2025
  5

• Defining an implementation limit on initializer expression size

  WebAssembly/design#1557 · Filter by author Liedtke opened on Mar 26, 2025
  4

• Newtypes for stronger control flow integrity

  WebAssembly/design#1556 · Filter by author SoniEx2 opened on Mar 18, 2025
  31

• Extension for access to JS array buffers from core wasm

  JS embedding
  WebAssembly/design#1555 · Filter by author eqrion opened on Feb 19, 2025
  11

• Most links in polyfill section of FAQ are broken

  documentation
  WebAssembly/design#1551 · Filter by author tomayac opened on Jan 13, 2025
  1

• Floating-point min and max that prefer numbers

  floating point
  WebAssembly/design#1548 · Filter by author sunfishcode opened on Jan 9, 2025
  4

• data.length opcode

  WebAssembly/design#1546 · Filter by author SoniEx2 opened on Dec 24, 2024
  2

• Proposal: An extremely simple solution to the WebAssembly memory issue

  linear memory
  WebAssembly/design#1543 · Filter by author BlobTheKat opened on Dec 11, 2024
  5

• Module splitting and type section duplication

  WebAssembly/design#1530 · Filter by author tlively opened on Sep 18, 2024
  7

• Extracting all lanes from a v128

  simd
  WebAssembly/design#1529 · Filter by author verbessern opened on Sep 16, 2024
  1

• Proposal: HW-Specialized WebAssembly

  WebAssembly/design#1528 · Filter by author abrown opened on Sep 12, 2024
  6

• [Use case] crypto

  WebAssembly/design#1526 · Filter by author ppenzin opened on Aug 14, 2024
  4

• filesystem: SCRIPTPATH and SCRIPTDIR

  WebAssembly/design#1524 · Filter by author abitrolly opened on Aug 3, 2024
  8