Implement CallSite.prototype.isConstructor()#1584
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The Error.prepareStackTrace CallSite objects exposed isNative, getFileName, getFunctionName and the position getters but not isConstructor(), which V8 provides. Track whether each stack frame was entered as a constructor (JS_CALL_FLAG_CONSTRUCTOR) and expose it on the CallSite.
saghul
approved these changes
Jul 17, 2026
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The
Error.prepareStackTraceCallSite objects exposeisNative,getFileName,getFunctionNameand the position getters, but notisConstructor(), which V8 provides.This tracks whether each stack frame was entered as a constructor (
JS_CALL_FLAG_CONSTRUCTOR) and exposes it on the CallSite.Disclaimer: This is an AI-assisted patch from the v8x project.