disallow-update.ts
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disallow-update.ts
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	import { HybridField, Field, Context, SuperContext } from "../../../main";

	export default class DisallowUpdate<T extends Field> extends HybridField<T> {
	typeName = "disallow-update";
	async isProperValue(
	context: Context,
	new_value: Parameters<T["checkValue"]>[1],
	old_value?: Parameters<T["checkValue"]>[2]
	) {
	context.app.Logger.debug3(
	"DISALLOW-UPDATE",
	"Checking if this field already has a value",
	{ new_value, old_value }
	);
	if (old_value === undefined) {
	return this.virtual_field.checkValue(
	new context.app.SuperContext(),
	new_value,
	old_value
	);
	}
	return Field.invalid("You cannot change a previously set value");
	}
	}