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  1. Qt
  2. QTBUG-126813

Type error thrown when assigning to properties of a WeakMap

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      In strict mode, the following code produces a type error, when executed from QML (by imorting a .js file or by having it directly in a .qml file):

      var foo = new WeakMap();
foo.set = ...; // <- TypeError

      The code seems to fail on a `SetLookup` instruction for the assignment, producing a `TypeError` when in strict mode:

          MOTH_BEGIN_INSTR(SetLookup)
        STORE_IP();
        STORE_ACC();
        QV4::Lookup *l = function->executableCompilationUnit()->runtimeLookups + index;
        if (!l->setter(l, engine, STACK_VALUE(base), accumulator) && function->isStrict())
            engine->throwTypeError(); // <- Here
        CHECK_EXCEPTION;
    MOTH_END_INSTR(SetLookup)

      This seems specific to the usage of `WeakMap` as the same code doesn't produce an error when used, for example, with an `Array`.

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            diseraluca Luca Di Sera
            diseraluca Luca Di Sera
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              Resolved:

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