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  1. Qt
  2. QTBUG-55058

Qt 5.7 QML breaks 3rd party JavaScript library

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      Upgrading our project to the latest version of Qt has been set back due to a change that breaks the Sugar.js library which we use extensively. The author of the library has investigated the issue and concluded that:

      an update to QML has made all native methods configurable: false, meaning that any attempt to override them results in a TypeError

      The author did suggest a workaround and I don't expect this to be addressed any time soon (but some official response would be nice), so this issue report is, in a broader scope, mostly to raise awareness about breaking changes in QML's JS engine, and that it's being used with non-QML JavaScript libraries (related: QTBUG-22356). To quote the author:

      the changes QML have instituted are not part of spec, and could potentially interfere with polyfills, so should be treated as a bug

      See the quoted discussion here: https://github.com/andrewplummer/Sugar/issues/551

      The issue might be present with 5.6 as well, I can't test it out at the moment.

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          relates to

          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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-84341 ECMAScript / Javascript Engine builtin objects are immutable (frozen)

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