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Add a new layer below labels

Use the second argument of addLayer to add a layer below labels.

<!DOCTYPE html>
<html lang="en">
    <title>Add a new layer below labels</title>
    <meta property="og:description" content="Use the second argument of addLayer to add a layer below labels." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='' />
    <script src=''></script>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
<div id="map"></div>
    const map = new maplibregl.Map({
        container: 'map',
        center: [-88.13734351262877, 35.137451890638886],
        zoom: 4

    map.on('load', () => {
        const layers = map.getStyle().layers;
        // Find the index of the first symbol layer in the map style
        let firstSymbolId;
        for (let i = 0; i < layers.length; i++) {
            if (layers[i].type === 'symbol') {
                firstSymbolId = layers[i].id;
        map.addSource('urban-areas', {
            'type': 'geojson',
                'id': 'urban-areas-fill',
                'type': 'fill',
                'source': 'urban-areas',
                'layout': {},
                'paint': {
                    'fill-color': '#f08',
                    'fill-opacity': 0.4
                // This is the important part of this example: the addLayer
                // method takes 2 arguments: the layer as an object, and a string
                // representing another layer's name. if the other layer
                // exists in the stylesheet already, the new layer will be positioned
                // right before that layer in the stack, making it possible to put
                // 'overlays' anywhere in the layer stack.
                // Insert the layer beneath the first symbol layer.