This package provides TypeScript guards for the Google Maps JavaScript API.
A type guard (or type predicate) is an expression that performs a runtime check that guarantees the type in some scope. Type guards are used to narrow the type of a variable or parameter.
For the complete API check the reference documentation.
Available via npm as the package @googlemaps/typescript-guards.
npm i @googlemaps/typescript-guards
The following example narrows a union type google.maps.LatLng | google.maps.LatLngLiteral to google.maps.LatLngLiteral using the isLatLngLiteral guard.
import { isLatLngLiteral } from "@googlemaps/typescript-guards";
const latLng: google.maps.LatLng | google.maps.LatLngLiteral = ...;
if (isLatLngLiteral(latLng)) {
lat = latLng.lat;
lng = latLng.lng;
} else {
lat = latLng.lat();
lng = latLng.lng();
}
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