Function ensure

client/src/client.ts:559–564

(target: T, key: K)

];

function ensure<T, K extends keyof T>(target: T, key: K): T[K] {
	if (target[key] === void 0) {
		target[key] = {} as any;
	}
	return target[key];
}

interface ResolvedTextDocumentSyncCapabilities {
	resolvedTextDocumentSync?: TextDocumentSyncOptions;