[Koha-bugs] [Bug 35718] New: Remove ES6 warnings from JavaScript system preferences

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=35718

            Bug ID: 35718
           Summary: Remove ES6 warnings from JavaScript system preferences
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Architecture, internals, and plumbing
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: lucas at bywatersolutions.com
        QA Contact: testopia at bugs.koha-community.org

When using any of the UserJS system preferences there are warnings if you use
any ES6 features/syntax.

To recreate:

1. Add some JS like this to any of the UserJS system preferences:

$(document).ready( function() {
    let something = 1;
    const another_thing = 2;

    let an_arrow_function = (a, b) => a + b;
    console.log( an_arrow_function(something, another_thing) );
});

2. Notice the icons and warnings to the left of the line numbers:

let is available in ES6
const is available in ES6
arrow_function_syntax is available in ES6


ES6 syntax is pretty commonly used now, I don't think we need those warnings.

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