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Change building color based on zoom level

Use the interpolate expression to ease-in the building layer and smoothly fade from one color to the next.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Change building color based on zoom level</title>
    <meta property="og:description" content="Use the interpolate expression to ease-in the building layer and smoothly fade from one color to the next." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/[email protected]/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/[email protected]/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<style>
    #zoom {
        display: block;
        position: absolute;
        top: 20px;
        left: 50%;
        transform: translate(-50%);
        width: 50%;
        height: 40px;
        padding: 10px;
        border: none;
        border-radius: 3px;
        font-size: 12px;
        text-align: center;
        color: #fff;
        background: #ee8a65;
    }
</style>
<div id="map"></div>
<button id="zoom">Zoom to buildings</button>
<script>
    const map = new maplibregl.Map({
        container: 'map',
        style:
            'https://api.maptiler.com/maps/basic/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
        center: [-90.73414, 14.55524],
        zoom: 13
    });

    map.on('load', () => {
        map.setPaintProperty('building', 'fill-color', [
            'interpolate',
            ['exponential', 0.5],
            ['zoom'],
            15,
            '#e2714b',
            22,
            '#eee695'
        ]);

        map.setPaintProperty('building', 'fill-opacity', [
            'interpolate',
            ['exponential', 0.5],
            ['zoom'],
            15,
            0,
            22,
            1
        ]);
    });

    document.getElementById('zoom').addEventListener('click', () => {
        map.zoomTo(19, {duration: 9000});
    });
</script>
</body>
</html>