Function updateObjectValueForKey

packages/language-service/src/utils/ts_utils.ts:220–230

(
  obj: ts.ObjectLiteralExpression,
  key: string,
  newValueFn: (oldValue?: ts.Expression) => ts.Expression,
)

 * for the key.
 */
export function updateObjectValueForKey(
  obj: ts.ObjectLiteralExpression,
  key: string,
  newValueFn: (oldValue?: ts.Expression) => ts.Expression,
): ts.PropertyAssignment {
  const existingProp = objectPropertyAssignmentForKey(obj, key);
  return ts.factory.createPropertyAssignment(
    ts.factory.createIdentifier(key),
    newValueFn(existingProp?.initializer),
  );
}

/**
 * Create a new ArrayLiteralExpression, or accept an existing one.