aretherecookies-mobile/js/apis/GoogleMapsApi.js

// @flow
import { GoogleAPIKey } from "../constants/AppConstants";
import { path } from "ramda";

const url = "https://maps.googleapis.com/maps/api/geocode/json";

type Location = {
	lat: number,
	lng: number
};

type AddressComponent = {
	long_name: string,
	short_name: string,
	types: Array<string>
};

type GeocodeResult = {
	results: Array<{
		address_components: Array<AddressComponent>,
		formatted_address: string,
		geometry: {
			location: Location
		},
		place_id: string,
		types: Array<string>
	}>
};

export const getCoordsFromZip = async (zip: string): Promise<Location> => {
	const res: GeocodeResult = await (await fetch(`${url}?key=${GoogleAPIKey}&address=${zip}`)).json();
	return path(["results", 0, "geometry", "location"], res) || { lat: 0, lng: 0 };
};