leaflet 2.0.0-beta.3

on Node.js Yarn

The third beta of Leaflet 2.0 makes chained view changes like setView(c).setZoom(z) or panTo(c).panBy(o) end where you'd expect, makes adding and removing event listeners up to hundreds of times faster on busy maps, and validates coordinates so bad data fails where it's created instead of somewhere deep in rendering. It also brings a round of keyboard and screen reader fixes for markers, popups and controls, along with over 15 bug fixes.

⚡️ Performance

• Make adding and removing event listeners constant-time: adding 50,000 markers with popups to a map takes 0.5 s instead of 15.6 s, and on, off, once and fire are faster in the common small cases too (#10537, #6914, #6923)
• Position tooltips without measuring them, so maps with many permanent tooltips zoom without a forced layout per tooltip (#6948)
• Construct Point objects ~40% faster, and the array and object forms of Point and LatLng 5–15% faster (#10550)

✨ Improvements

• Make view changes compose regardless of call order and timing: setView(c) then setZoom(z) (or the reverse) keeps both, panTo(c).panBy(o) ends at c + o, and zoomIn() calls during a zoom animation add up (#10549, #2609, #2915, #7766 by @Falke-Design)
• Validate Point and LatLng coordinates, accepting numbers and numeric strings, and make Point.validate() and LatLng.validate() match exactly what the constructors accept, so they can filter data (#10550, #7765 and #7767 by @johnd0e, #8214 by @Falke-Design)
• Allow dragging the map during a zoom animation instead of treating the drag as a click (#8201)
• Let shift-drag pan the map and drag markers when box zoom is disabled (#2772, #6233, #7088)
• Honor coords.z in TileLayer#getTileUrl, so it can build URLs for zoom levels other than the current one (#8849, #9201 by @yohanboniface)
• Style <button> and other role="button" elements in leaflet-bar controls like links (#9462, @someonewithpc)
• Support numeric strings and a partly automatic size like [100, 'auto'] in iconSize (#9253)
• Add a getEvents() hook to controls, like the one on layers: the map listeners it returns are added and removed with the control (#10229)

♿️ Accessibility

• Bring a focused marker to the front whatever riseOnHover is set to, so it's never hidden under its neighbors (#10536, #8078)
• Return focus to the marker whenever its popup closes with focus inside it, not only on Escape (#10536, #8115)
• Set aria-expanded and aria-controls on keyboard-accessible markers with a popup (#10536, #7527)
• Move focus into a popup opened from a marker with the keyboard, and keep focus on a marker activated by a screen reader (#8113, #8114)
• Keep focus on a control after clicking it instead of moving it to the map (#7947)
• Make Space activate the zoom, layers and fullscreen buttons and the popup close button (#7369)
• Open tooltips only on keyboard focus, so a tooltip no longer appears when the window regains focus or a popup closes (#9150)
• Translate the default marker alt text with the translate map option (#10542 by @nfreear, #10541)
• Raise the attribution and scale contrast to pass WCAG AA, with solid backgrounds and underlined links under prefers-contrast: more (#6742, #7538, #10536)

🐞 Bug fixes

• Fix tiles flickering during fractional zoom animations past a layer's maxZoom (#8300, #8311 by @sbquinlan)
• Fix polygons disappearing when weight is a string (#6072, #7432)
• Fix tooltip positions in right-to-left containers (#7201, #7782)
• Fix the expanded layers list sometimes being covered by other controls (#7944)
• Fix a dragged marker's autoPan panning past maxBounds (#10539 by @A350xt, #6219)
• Fix DocumentFragment popup and tooltip content being empty after the first open (#10540 by @A350xt, #3922)
• Fix setIcon keeping the size, anchor, bgPos and crossOrigin of the previous icon when the new one doesn't set them (#10538 by @b84330808)
• Fix fitBounds and getBoundsZoom zooming all the way in when the padding is larger than the map (#10544 by @jayhemnani9910)
• Fix overlaps() on Bounds and LatLngBounds returning true for a point or line inside the other bounds (#10547 by @xunguangzlj-cloud)
• Fix a layer with a NaN minZoom or maxZoom breaking the map's zoom limits (#10548 by @xunguangzlj-cloud, #8354)
• Fix togglePopup() and toggleTooltip() throwing on a layer that isn't on the map (#10551 by @Enesuygurs)
• Fix listeners added during fire being called by that same fire, a regression from 1.x (#10537)
• Fix setView with worldCopyJump leaving the map outside the main world copy when it doesn't animate (#10549)
• Fix getCenter() returning a center snapped to whole pixels right after the map is created

📝 Docs

• Mark the text that the translate option translates with a "Translatable" badge in the reference (#10546 by @Falke-Design)
• Document the flyTo and pinch flags of move and zoom events (#9775), and how to stop control events from reaching the map (#10299)

⚠️ Breaking changes

• LatLng and Point throw Invalid LatLng object / Invalid Point object for coordinates that aren't numbers or numeric strings. null, '' and booleans used to become 0 or 1, and missing coordinates ({lat: 50}) gave NaN. A non-numeric altitude throws too, and null altitude means no altitude instead of 0. Point converts numeric strings to numbers instead of keeping them (#10550)
• A non-numeric radius on a circle or circle marker throws, and a numeric string is converted to a number
• zoomIn(), zoomOut(), setZoom(), panTo() and panBy() build on the view a running animation is heading to: two quick zoomIn() calls (or clicks on the zoom button) zoom in two levels. panBy during a zoom animation waits for it to end (#10549)
• riseOnHover only controls hover: focused markers always come to the front (#10536)
• The attribution and scale controls have black text on a 90% white background, and attribution links are a darker blue (#6742, #7538)
• Control#_refocusOnMap is gone. ZoomControl, ScaleControl and AttributionControl add their map listeners through getEvents(), and ZoomControl and ScaleControl no longer have an onRemove method
• TileLayer#_getZoomForUrl takes the tile zoom as an argument