Step Function TS to ASL

asl.js

{
  StartAt: "State1",
  States: {
    State1: {
      Catch: [
        {
          ErrorEquals: ["States.All"],
          Next: "Throw",
        },
      ],
      Next: "State2",
      ResultPath: "$.person",
      Parameters: {
        Key: {
          id: {
            "S.$": "$.id",
          },
        },
        TableName: personTable.resource.tableName,
      },
      Resource: "arn:aws:states:::aws-sdk:dynamodb:getItem",
      Type: "Task",
    },
    State2: {
      Choices: [
        {
          Or: [
            {
              Variable: "$.person.Item",
              IsPresent: false,
            },
            {
              Variable: "$.person.Item",
              IsNull: true,
            },
          ],
          Next: "State3",
        },
      ],
      Default: "State4",
      Type: "Choice",
    },
    State3: {
      Next: "Success",
      Parameters: {
        result: null,
      },
      OutputPath: "$.result",
      Type: "Pass",
    },
    State4: {
      Catch: [
        {
          ErrorEquals: ["States.All"],
          Next: "Throw",
        },
      ],
      Next: "State5",
      ResultPath: "$.score",
      Parameters: {
        person: {
          "id.$": "$.person.Item.id.S",
          "name.$": "$.person.Item.name.S",
        },
      },
      Resource: computeScore.resource.functionArn,
      Type: "Task",
    },
    State5: {
      Next: "Success",
      Parameters: {
        result: {
          "id.$": "$.person.Item.id.S",
          "name.$": "$.person.Item.name.S",
          "score.$": "$.score",
        },
      },
      OutputPath: "$.result",
      Type: "Pass",
    },
    Success: {
      Type: "Succeed",
    },
    Throw: {
      Error: "TODO",
      Type: "Fail",
    },
  },
}

macine.ts

new ExpressStepFunction(
  stack,
  "fn",
  (id: string): (Person & { score: number }) | undefined => {
    const person = $AWS.DynamoDB.GetItem({
      TableName: personTable,
      Key: {
        id: {
          S: id,
        },
      },
    });

    if (person.Item === undefined) {
      return undefined;
    }

    const score = computeScore({
      id: person.Item.id.S,
      name: person.Item.name.S,
    });

    return {
      id: person.Item.id.S,
      name: person.Item.name.S,
      score,
    };
  }
)