Standard libraries that lift up your code.
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import {Collection} from '../collection/Collection'
import {uuid4} from './data'
/**
* Type structure for a single item in the global registry.
*/
export type GlobalRegistrant = { key: string | symbol, value: any }
/**
* A convenient class to manage global variables.
*/
export class GlobalRegistry extends Collection<GlobalRegistrant> {
constructor() {
super()
this.setGlobal('registry_uuid', uuid4())
}
/**
* Store the given `value` associated by `key`.
* @param key
* @param value
*/
public setGlobal(key: string | symbol, value: unknown): this {
const existing = this.firstWhere('key', '=', key)
if ( existing ) {
existing.value = value
} else {
this.push({
key,
value,
})
}
return this
}
/**
* Retrieve the value of the given `key`, if it exists in the store.
* @param key
*/
public getGlobal(key: string | symbol): any {
return this.firstWhere('key', '=', key)?.value
}
}
/**
* Export a singleton global registry for all code to share.
*
* Exporting an instance here guarantees that all code that import it will get the same instance.
*/
export const globalRegistry = new GlobalRegistry()