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

	export default class DisallowUpdate<
	DecodedType,
	InputType,
	StorageType,
	T extends Field<DecodedType, InputType, StorageType>,
	> extends HybridField<
	DecodedType,
	InputType,
	StorageType,
	DecodedType,
	InputType,
	StorageType,
	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,
	item: CollectionItem \| undefined = undefined
	) {
	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(
	context,
	new_value,
	old_value,
	new_value_blessing_token,
	item
	);
	}
	return Field.invalid(
	context.i18n`You cannot change a previously set value.`
	);
	}
	}