I18n.ts

I18n.ts

interface FormatDescriptor {
	id: string;
	defaultTemplate?: string;
}

export type Formatted =
	| { kind: 'text'; value: string }
	| { kind: 'sequence'; items: Formatted[] }
	| { kind: 'object'; items: Record<string, Formatted> };

export interface I18nService {
	format<TData extends Record<string, unknown>>(
		descriptor: FormatDescriptor,
		data: TData
	): Formatted;
}

const service: I18nService = null!;

const count = 10;
service.format(
	{
		id: 'items',
		defaultTemplate: `There {
				pluralCat($count).match({
					singular: "is one {$Link("item")}",
					other: "are {numToWords($count)} {$Link("items")}"
				})
			}`,
	},
	{ count, Link: (text: string) => '' }
);