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What's Changed

  • The JSPI setting is no longer considered experimental, and the compiler diagnostic warning has been removed. (#27559)
  • Added support for epoll (epoll_create1/epoll_ctl/epoll_wait/ epoll_pwait) on the legacy (non-WASMFS) JS filesystem, including level- and edge-triggered modes, EPOLLONESHOT, EPOLLEXCLUSIVE, EPOLLRDHUP, nesting, and blocking waits under PROXY_TO_PTHREAD, ASYNCIFY, and JSPI. (#27207)
  • The deprecated LEGALIZE_JS_FFI setting was completely removed and moved to legacy settings. This behaviour of lowering away i64 values at the Wasm bounary is still used when WASM_BIGINT is disabled. However disabling of WASM_BIGINT itself should only be needed under -sWASM=0 (where it is automatically disabled). (#27568)
  • The SOCKET_WEBRTC setting was removed (#27367)
  • WASM_BIGINT was deprecated. BigInt integration is standard and enabled by default across all supported engines; it should now only ever be disabled implicitly when targeting JavaScript via -sWASM=0. (#27558)

Contributors

Thanks to the following contributors: @sbc100 (10) @guybedford (2) @brendandahl (1)

Full Changelog: https://github.com/emscripten-core/emscripten/compare/6.0.7...6.0.8

Source: README.md, updated 2026-08-20