Data-driven styling a layer with a pre-computed line-gradient ?

mapbox-gl-js version: latest

Question

Hello!

I would like to use data-driven properties for a layer with line-gradient property (I don't want to create a layer for each line feature that needs a particular color gradient, for it would be overkill).
I read in the documentation that data-driven properties are not supported for line-gradient, and I'm wondering if this non-support also includes gradients 100% stored as feature properties (as opposed to gradient values picked from feature properties, which is not possible, as mentioned here).

Here's an example of what I'm trying to achieve:

{
    id: 'line',
    type: 'line',
    source: 'line'
    layout: {
        'line-cap': 'round',
        'line-join': 'round'
    },
    paint: {
        'line-color': '#ff0000',
        'line-width': 5,
        'line-gradient': [
            'case',
            ['has', 'averageErrorGradientData'],
            ['get', 'averageErrorGradientData'],
            [
                'interpolate',
                ['linear'],
                ['line-progress'],
                0,
                'blue',
                1,
                'red'
            ]
        ]
    },
};

Thanks!

Links to related documentation

• https://docs.mapbox.com/mapbox-gl-js/style-spec/layers/#paint-line-line-gradient

Start with the linked line-gradient paint-property documentation and the expression shown in the issue. Determine whether a complete gradient stored in feature properties is supported, distinct from selecting gradient values from feature properties. Done would require a documented answer or a defined implementation path; the issue names no source files or tests.