input-validation.md

check argument type

Open in playground

export const main = asl.deploy.asStateMachine(async (input: Input) => {
  if (typeof input.delayInSeconds !== "number") {
    throw new ValidationError("delayInSeconds must be a number");
  }
  await asl.wait({ seconds: input.delayInSeconds });
});

interface Input {
  delayInSeconds: number | undefined;
}
class ValidationError extends Error {
  constructor(message: string) {
    super(message);
  }
}

check argument type provide default

Open in playground

export const main = asl.deploy.asStateMachine(async (input: Input) => {
  if (typeof input.delayInSeconds !== "number") {
    input.delayInSeconds = 5;
  }
  await asl.wait({ seconds: input.delayInSeconds });
  return input.delayInSeconds;
});

interface Input {
  delayInSeconds: number | undefined;
}
class ValidationError extends Error {
  constructor(message: string) {
    super(message);
  }
}

check argument range

Open in playground

export const main = asl.deploy.asStateMachine(async (input: Input) => {
  if (typeof input.delayInSeconds !== "number") {
    input.delayInSeconds = 5;
  }

  if (input.delayInSeconds > 10 || input.delayInSeconds < 1) {
    throw new ValidationError(
      "delay in seconds must be numeric value no greater than 10 and no smaller than 1"
    );
  }

  await asl.wait({ seconds: input.delayInSeconds });
  return input.delayInSeconds;
});

interface Input {
  delayInSeconds: number | undefined;
}
class ValidationError extends Error {
  constructor(message: string) {
    super(message);
  }
}