I'm facing a challenge in creating a d.ts file for the given DOM feature.
Storage.prototype.setObject = function(key:string, value:any) {
this.setItem(key, JSON.stringify(value));
}
Storage.prototype.getObject = function(key:string) {
var value = this.getItem(key);
return value && JSON.parse(value);
}
What is the best way to enhance the default dom Storage definition type for this scenario?
In order to enhance the Storage interface, you simply need to extend it as follows:
interface Storage {
setObject<T>(key:string, value:T):void;
getObject<T>(key:string):T;
}
To specify the type of function's this, you can utilize a dummy this parameter (which should be the first one in the function):
Storage.prototype.setObject = function(this:Storage, key:string, value:any) {
this.setItem(key, JSON.stringify(value));
}
Storage.prototype.getObject = function(this:Storage, key:string) {
var value = this.getItem(key);
return value && JSON.parse(value);
}
When running this code snippet in Typescript: [].map(JSON.stringify); An error is being thrown: Argument of type '{ (value: any, replacer?: ((key: string, value: any) => any) | undefined, space?: string | number | undefined): string; (value: any, ...
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