conditional-check-failed-exception.ts

import { Entity, ElectroError } from 'electrodb';
import { DynamoDBClient } from "@aws-sdk/client-dynamodb";

const table = 'electro';

const client = new DynamoDBClient({
  region: "us-east-1",
  endpoint: 'http://localhost:8000',
  credentials: {
      accessKeyId: 'fake',
      secretAccessKey: 'fake',
  }
});

function isConditionalRequestFailedError(err: unknown): boolean {
  return err instanceof ElectroError &&
    err.cause?.name === 'ConditionalCheckFailedException';
}

const Thing = new Entity(
    {
      model: {
        entity: "thing",
        version: "1",
        service: "store"
      },
      attributes: {
        id: {
          type: "string",
        },
      },
      indexes: {
        id: {
          pk: {
            field: "pk",
            composite: ["id"]
          },
          sk: {
            field: "sk",
            composite: [],
          }
        },
      }
    },
    { table, client }
);


(async function main() {
  try {
    await Thing.remove({ id: "123" }).go();
  } catch(err: unknown) {
    if (isConditionalRequestFailedError(err)) {
      console.log('task already exists');
    } else {
      console.log('something went wrong', err);
    }
  }
})().catch(console.error);