WebAssembly/binaryen

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Optimizer and compiler/toolchain library for WebAssembly

Stars: 8.6k
Forks: 885
Open beginner issues: 0
Indexed issues: 332
Avg merge: 1d 19h
Merged PRs (30d): 69

Dominant language: WebAssembly
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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332 open issues indexed

List of missing peephole optimizations Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

WebAssembly/binaryen#1764 · 62 comments · Opened Nov 24, 2018
How to compile C++ code in Web assembly Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#1710 · 2 comments · Opened Oct 24, 2018
API replacement for recently removed BinaryenRemoveImport Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#1688 · 3 comments · Opened Sep 25, 2018
Slow to disassemble some crafted wasm files Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#1663 · 3 comments · Opened Sep 2, 2018
Missing import library for DLL Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

WebAssembly/binaryen#1633 · 2 comments · Opened Aug 12, 2018
Add an option to emit tracing output to a file Open

help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/binaryen#1618 · Opened Jul 9, 2018
Missing C API for inspecting Memory? Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#1603 · 2 reactions · Opened Jun 19, 2018
Use wasm customSections, to fix Binaryen WASM to text format round tripping failing for side module Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#1582 · 2 comments · Opened Jun 3, 2018
wasm2asm: Needs support for exported tables Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#1562 · 2 comments · 2 reactions · Opened May 22, 2018
Invalid unreachable loop in text format Open

help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/binaryen#1541 · 14 comments · Opened May 10, 2018
Inlining exported functions, -O vs -O3 Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/binaryen#1492 · 5 comments · 1 reaction · Opened Apr 2, 2018
Type-check invalid unreachable code Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#1485 · 8 comments · Opened Mar 20, 2018
wasm2asm miscompiles nested i64 ops Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/binaryen#1480 · 4 comments · Opened Mar 16, 2018
Invalid LEBs are incorrectly accepted by binary loading Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#1469 · Opened Mar 12, 2018
wasm-reduce problems on OS X Open

help wanted

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#1441 · 2 comments · Opened Feb 23, 2018
Global to local optimization idea Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#1371 · 6 comments · Opened Jan 18, 2018
testing with out-of-tree builds fails when running binaryen.js testcases Open

help wanted

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

WebAssembly/binaryen#1370 · Opened Jan 18, 2018
Consider moving binaryen (and other tools) into a different org Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#1358 · 14 comments · 1 reaction · Opened Jan 11, 2018
Speed up LocalGraph Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#1338 · 8 comments · Opened Dec 18, 2017
Steps for supporting a language.. Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#1312 · 44 comments · Opened Nov 30, 2017
Creating relocatable binaries via AST Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#1307 · 21 comments · Opened Nov 28, 2017
Handling of exported _GLOBAL__sub_I_* functions Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#1215 · 6 comments · Opened Oct 7, 2017
Constant propagation pass Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#1172 · Opened Sep 7, 2017
Explore Similar Function Elimination (SFE) optimization Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#1142 · 44 comments · Opened Aug 21, 2017
wasm-opt: tables cannot be declared after functions Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#1108 · 5 comments · 1 reaction · Opened Jul 21, 2017
How use wasm code without import external file Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#1048 · Opened Jun 10, 2017
auto-update problem on test/fib-dbg.wasm.fromBinary Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#1040 · 1 comment · Opened Jun 6, 2017
Add support for module names in wasm binaries Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#1010 · 2 comments · Opened May 11, 2017
Recreate and optimize control flow Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#953 · 1 comment · Opened Mar 18, 2017
Find good inlining heuristics Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#815 · 2 comments · Opened Oct 30, 2016
Test suite failures on test/validator/invalid_import.wast and test/validator/invalid_export.wast Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

WebAssembly/binaryen#782 · 4 comments · Opened Oct 15, 2016
Binary encoding isn't fully validated Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#549 · 2 comments · Opened May 27, 2016

WebAssembly/binaryen

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