From e33a0f4682374faadc0a6ef5bb02b16bcc3f2d88 Mon Sep 17 00:00:00 2001 From: Andrea Giammarchi Date: Wed, 2 Jul 2025 18:54:21 +0200 Subject: [PATCH] webassembly/objpyproxy: Avoid throwing on symbol or iterator has-check. JavaScript code uses "Symbol in object" to brand check its own proxies, and such checks should also work on the Python side. Signed-off-by: Andrea Giammarchi --- ports/webassembly/objpyproxy.js | 6 ++++++ tests/ports/webassembly/py_proxy_has.mjs | 2 ++ tests/ports/webassembly/py_proxy_has.mjs.exp | 2 ++ 3 files changed, 10 insertions(+) diff --git a/ports/webassembly/objpyproxy.js b/ports/webassembly/objpyproxy.js index 3b94f8aadc782..0eafd0dec53de 100644 --- a/ports/webassembly/objpyproxy.js +++ b/ports/webassembly/objpyproxy.js @@ -148,6 +148,12 @@ const py_proxy_handler = { }; }, has(target, prop) { + // avoid throwing on `Symbol() in proxy` checks + if (typeof prop !== "string") { + // returns true only on iterator because other + // symbols are not considered in the `get` trap + return prop === Symbol.iterator; + } return Module.ccall( "proxy_c_to_js_has_attr", "number", diff --git a/tests/ports/webassembly/py_proxy_has.mjs b/tests/ports/webassembly/py_proxy_has.mjs index 8881776fdbe51..37df0ae1794c9 100644 --- a/tests/ports/webassembly/py_proxy_has.mjs +++ b/tests/ports/webassembly/py_proxy_has.mjs @@ -9,3 +9,5 @@ x = [] const x = mp.globals.get("x"); console.log("no_exist" in x); console.log("sort" in x); +console.log(Symbol.toStringTag in x); +console.log(Symbol.iterator in x); diff --git a/tests/ports/webassembly/py_proxy_has.mjs.exp b/tests/ports/webassembly/py_proxy_has.mjs.exp index 1d474d5255713..7565230c01f70 100644 --- a/tests/ports/webassembly/py_proxy_has.mjs.exp +++ b/tests/ports/webassembly/py_proxy_has.mjs.exp @@ -1,2 +1,4 @@ false true +false +true pFad - Phonifier reborn

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