in packages/geofire-common/src/index.ts [248:259]
export function wrapLongitude(longitude: number): number {
if (longitude <= 180 && longitude >= -180) {
return longitude;
}
const adjusted = longitude + 180;
if (adjusted > 0) {
return (adjusted % 360) - 180;
}
else {
return 180 - (-adjusted % 360);
}
}