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

	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],
	new_value_blessing_token: symbol \| null = null
	) {
	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,
	new_value_blessing_token
	);
	}
	return Field.invalid(context.app.i18n("invalid_update"));
	}
	}