eliminate map tile seams in Leaflet 1.0

gistfile1.txt

import leaflet from 'leaflet';
// ...
patchMapTileGapBug();
// ...
function patchMapTileGapBug () {

    // Workaround for 1px lines appearing in some browsers due to fractional transforms
    // and resulting anti-aliasing. adapted from @cmulders' solution:
    // https://github.com/Leaflet/Leaflet/issues/3575#issuecomment-150544739
    let originalInitTile = leaflet.GridLayer.prototype._initTile;
    if (originalInitTile.isPatched) return;

    leaflet.GridLayer.include({
        _initTile: function (tile) {
            originalInitTile.call(this, tile);

            var tileSize = this.getTileSize();

            tile.style.width = tileSize.x + 1 + 'px';
            tile.style.height = tileSize.y + 1 + 'px';
        }
    });

    leaflet.GridLayer.prototype._initTile.isPatched = true;

}