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  1. Qt
  2. QTBUG-84341

ECMAScript / Javascript Engine builtin objects are immutable (frozen)

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    • Windows

    Description

      As already reported in other issues, multiple external (3rd party) JS libraries are unusable in Qt / QML as they depend on altering (replacing) builtin objects properties / functionalities. This should be possible but results in

      TypeError: Type error

      In our case, it is pdfMake but has already been reported to break the usage of sugar.js (see unresolved QTBUG-55058 and others since Qt 5.7.

      It seems there "once was" an idea to resolve this issue, but did never make it into release and was abandoned.

      Obviously it would greatly improve feasibility of JS oriented projects implemented with Qt / QML, if external JS libraries could be used with less hassle and pain.

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          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-22787 Cannot set properties on QJSEngine's global object in initializeEngine()

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-101298 Extending the Error class errors when trying to overwrite the `name` property

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-55058 Qt 5.7 QML breaks 3rd party JavaScript library

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-66932 REGRESSION: Object.getOwnPropertyDescriptor returns wrong property descriptors for builtin objects

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Open

          Task - A task that needs to be done. QTBUG-51597 QML compile time optimizations for global object

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open

          Suggestion - Public suggestions QTBUG-22356 Investigate support for 3rd party JS libraries

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-126813 Type error thrown when assigning to properties of a WeakMap

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          mentioned in

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          For Gerrit Dashboard: QTBUG-84341
          # Subject Branch Project Status CR V
          429349,8 Allow limited extensions to globals dev qt/qtdeclarative Status: MERGED +2 0

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              qtqmlteam Qt Qml Team User
              attisan Attila Santo
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              Dates

                Created:
                Updated:

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