Function caseWhen

packages/db/src/query/builder/functions.ts:578–599

(...args: Array<CaseWhenValue>)

  ...rest: Array<CaseWhenValue>
): any
export function caseWhen(...args: Array<CaseWhenValue>): any {
  if (args.length < 2) {
    throw new Error(`caseWhen() requires at least two arguments`)
  }

  const pairCount = Math.floor(args.length / 2)
  for (let i = 0; i < pairCount; i++) {
    const condition = args[i * 2]
    if (!isConditionValue(condition)) {
      throw new Error(`caseWhen() conditions must be expression-like values`)
    }
  }

  if (caseWhenHasOnlyExpressionValues(args)) {
    return new Func(
      `caseWhen`,
      args.map((arg) => toExpression(arg)),
    )
  }

  return new CaseWhenWrapper(args)
}

export function add<T1 extends ExpressionLike, T2 extends ExpressionLike>(
  left: T1,