Pinning d3-tile@0.0.4 fixes the error. Edit: the complete list of versions that matches the last edit date is ``` d3 = require("d3-drag@1.2.1", "d3-tile@0.0.4", "d3-fetch@0.1", "d3-geo@1.10.0", "d3-geo-projection@2.4.0", "d3-selection@1.3.0", "d3-color@1.0.3") ```

Thanks a bunch! Just published with your fix.