aws-sdk.js

const stubs = require('./aws-stubs');
const AWS = {};

AWS.config = {
    setPromisesDependency: (arg) => {}
};

AWS.S3 = function() {

}

AWS.S3.prototype = {
    ...AWS.S3.prototype,

    // Stub for the listObjectsV2 method in the sdk
    listObjectsV2(params){
        const stubPromise = new Promise((resolve, reject) => {
            resolve(stubs.listObjects);
        });

        return {
            promise: () => {
                return stubPromise;
            }
        }
    }
};

module.exports = AWS; 

Hi Derik, I tried following the same thing as per your blog post with following as my aws-sdk.ts in the __mock__ dir

const AWS = {
  config: {
    setPromisesDependency: (arg) => {},
    update: (arg) => {},
  },
  Lambda: function() {},
  DynamoDB: {
    DocumentClient: function(params) {
      console.log('DocumentClient is instantiated');
    },
  },
  CloudWatch: function() {},
};

AWS.DynamoDB.DocumentClient.prototype = {
  ...AWS.DynamoDB.DocumentClient.prototype,
  put(params, callback) {
    console.log('Dynamo DocumentClient put mock', params);
    callback(null, {});
  },
  update(params, callback) {
    // console.log("Dynamo DocumentClient updateItem mock")
    callback(null, {});
  },
  get(params, callback) {
    // console.log("Dynamo DocumentClient get mock")
    /*
       https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#get-property
      */
    callback(null, {});
  },
};

export default AWS;

however I get following error on the file where aws sdk is being imported.

Test suite failed to run

    TypeError: Cannot read property 'inherit' of undefined

    > 1 | import * as AWS from 'aws-sdk';
        | ^
      2 |