Proxy for Error Classes

[sam-goodwin]

Can we generate some types for the various AWS SDK errors, e.g. ConditionCheckFailed and then provide a proxy that lazily instantiates a class when accessed?

const dynamo = new AWS.DynamoDB();

try {
  await dynamo.putItem({ .. })
} catch (err) {
  if (err instanceof AWS.DynamoDB.ConditionCheckFailed) {
    
  }
}

[sam-goodwin]

Proxy could work like:

let errorClasses = {};

new Proxy({}, {
  get: (_, className) => errorClasses ??= (class extends Error {
    constructor(type: string, message: string) { .. }
  })
}

Hard parts:

1. how do we enumerate all the different errors?
2. how do we map AWS's internal error IDs, e.g. __type: 'com.amazon.coral.validate#ValidationException', to a class?