# Google Maps TypeScript Guards

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## Description

This package provides [TypeScript guards](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicates) 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.

## Documentation

For the complete API check the [reference documentation](https://googlemaps.github.io/js-typescript-guards/index.html).

## Install

Available via npm as the package [@googlemaps/typescript-guards](https://www.npmjs.com/package/@googlemaps/typescript-guards).

```sh
npm i @googlemaps/typescript-guards
```

## Example

The following example narrows a union type `google.maps.LatLng | google.maps.LatLngLiteral` to `google.maps.LatLngLiteral` using the `isLatLngLiteral` guard.

```typescript
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();
}
```


TypeScript guards for Google Maps Platform JavaScript. 

Meet the Socket Team at BlackHat and DEF CON in Las Vegas, Aug 4-6

@googlemaps/typescript-guards

TypeScript guards for Google Maps Platform JavaScript.

google-wombot

jpoehnelt

typescript-guards

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@googlemaps/typescript-guards

Google Maps TypeScript Guards

Description

Documentation

Install

Example

Keywords

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@googlemaps/typescript-guards

Google Maps TypeScript Guards

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