Leaflet: Leaflet 1.9 breaks Leaflet.heat

Checklist

• I’ve looked at the documentation to make sure the behavior isn’t documented and expected.
• I’m sure this is an issue with Leaflet, not with my app or other dependencies (Angular, Cordova, React, etc.).
• I’ve searched through the current issues to make sure this hasn’t been reported yet.
• I agree to follow the Code of Conduct that this project adheres to.

Steps to reproduce

First of all, thanks for your work!

The steps to reproduce the issue is just updating leaflet to 1.9 and use the leaflet.heat package. (https://github.com/Leaflet/Leaflet.heat) I also use the @types/leaflet and @types/leaflet-heat packages.

Expected behavior

This worked before 1.9.0:

import * as L from 'leaflet';
import 'leaflet.heat';
....

const heatmapLayer = L.heatLayer(data, { radius: 15, max: 10, minOpacity: 0.75 });

Current behavior

The app breaks and produces the following error:

export 'heatLayer' (imported as 'L') was not found in 'leaflet' (possible exports: Bounds, Browser, CRS, Canvas, Circle, CircleMarker, Class, Control, DivIcon, DivOverlay, DomEvent, DomUtil, Draggable, Evented, FeatureGroup, GeoJSON, GridLayer, Handler, Icon, ImageOverlay, LatLng, LatLngBounds, Layer, LayerGroup, LineUtil, Map, Marker, Mixin, Path, Point, PolyUtil, Polygon, Polyline, Popup, PosAnimation, Projection, Rectangle, Renderer, SVG, SVGOverlay, TileLayer, Tooltip, Transformation, Util, VideoOverlay, bind, bounds, canvas, circle, circleMarker, control, default, divIcon, extend, featureGroup, geoJSON, geoJson, gridLayer, icon, imageOverlay, latLng, latLngBounds, layerGroup, map, marker, noConflict, point, polygon, polyline, popup, rectangle, setOptions, stamp, svg, svgOverlay, tileLayer, tooltip, transformation, version, videoOverlay)

Minimal example reproducing the issue

No response

Environment

• Leaflet version: 1.9.0
• Browser (with version): All
• OS/Platform (with version): All