enum.ts
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enum.ts
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	import { Field, Context, App } from "../../../main";

	type Props<S> = S[] \| ((app: App) => S[]);

	/** Allows only a specified set of values.
	*
	* Params:
	* - `allowed_values` - `Array<any>` - list of acceptable values
	*/
	export default class Enum<S> extends Field {
	typeName = "enum";
	allowed_values: Props<S>;

	constructor(allowed_values: Props<S>) {
	super();
	this.allowed_values = allowed_values;
	}

	getAllowedValues(app: App): S[] {
	return this.allowed_values instanceof Function
	? this.allowed_values(app)
	: this.allowed_values;
	}

	async isProperValue(context: Context, value: S) {
	if (this.getAllowedValues(context.app).includes(value)) {
	return Field.valid();
	} else {
	return Field.invalid(
	"Allowed values: " + this.getAllowedValues(context.app).join()
	);
	}
	}
	}