Webpack 5 Builds for AWS Lambda Functions with TypeScript

In a previous post, I wrote about  self-destructing tweets which runs as an AWS Lambda function every night at midnight.

While that post was about the code itself, most of the AWS CDK infrastructure information had been written in a previous post about  sending a serverless Slack message which demonstrated how to run an AWS Lambda on a cron timer.

Today’s post will be a short overview that bridges these together: it shows how I bundled the TypeScript code from the Twitter post with node modules and prepare it for deployment.

The Folder Structure

I am making assumptions here. The most “complex” set up I normally have for Lambdas is to write them in TypeScript and use Babel for transpilation.

Given this will be a familiar standing for most, let’s work with that.

#aws #javascript #typescript #webpack #lambda

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Webpack 5 Builds for AWS Lambda Functions with TypeScript

In a previous post, I wrote about  self-destructing tweets which runs as an AWS Lambda function every night at midnight.

While that post was about the code itself, most of the AWS CDK infrastructure information had been written in a previous post about  sending a serverless Slack message which demonstrated how to run an AWS Lambda on a cron timer.

Today’s post will be a short overview that bridges these together: it shows how I bundled the TypeScript code from the Twitter post with node modules and prepare it for deployment.

The Folder Structure

I am making assumptions here. The most “complex” set up I normally have for Lambdas is to write them in TypeScript and use Babel for transpilation.

Given this will be a familiar standing for most, let’s work with that.

#aws #javascript #typescript #webpack #lambda

Webpack 5 Builds for AWS Lambda Functions with TypeScript

In a previous post, I wrote about self-destructing tweets which runs as an AWS Lambda function every night at midnight.

While that post was about the code itself, most of the AWS CDK infrastructure information had been written in a previous post about sending a serverless Slack message which demonstrated how to run an AWS Lambda on a cron timer.

Today’s post will be a short overview that bridges these together: it shows how I bundled the TypeScript code from the Twitter post with node modules and prepare it for deployment.

The Folder Structure

I am making assumptions here. The most “complex” set up I normally have for Lambdas is to write them in TypeScript and use Babel for transpilation.

Given this will be a familiar standing for most, let’s work with that.

Here is how most of my lambdas following this structure will look from within the function folder:

https://gist.github.com/okeeffed/9b1e7edc86caff76179d434850f063c0.js

.
├── nodemon.json
├── package-lock.json
├── package.json
├── src
│   ├── index.local.ts
│   ├── index.ts
│   └── function.ts
├── tsconfig.json
├── .babelrc
└── webpack.config.js

You might also note I have both an index.ts and index.local.ts file. index.ts in my project is generally the entry point for the lambda, where the index.local.ts file is normally just used for local development where I swap out my lambda handler for code that lets me run.

Both generally import the main function from another file (here denoted as function.ts) and just call it.

Webpack will bundle everything into one file later, so it is fine for me to structure the folder however I see fit.

Setting Up Your Own Project

Inside of a fresh npm project that houses a TypeScript lambda, we need to add to required Babel and Webpack dependencies:

https://gist.github.com/okeeffed/83313ff75f314653c67760251571320d.js

npm i --save-dev \
  ## install required babel deps
  @babel/core \
  @babel/preset-env \
  @babel/preset-typescript \
  ## webpack deps and loaders required
  webpack \
  webpack-cli \
  babel-loader \
  cache-loader \
  fork-ts-checker-webpack-plugin \
  ## finally install TypeScript
  typescript

#webpack #aws #typescript #programming #developer

Calling an AWS Lambda function from another Lambda function

In this article, I am going to explain how to create an AWS Lambda function and then call this function from another Lambda function within the same region. This is a useful scenario in which we may need to execute a second lambda function based on the outcome of some previous logic. Another scenario may be to execute a second lambda function several times by using different parameters.

For the sake of this article, we will consider a typical retailer application, in which we can purchase different products from a retailer site using a lambda function.

Figure 1 – Architecture Diagram

If you consider the above architecture diagram, you can see that we have an AWS lambda function – the ParentFunction, which assumes a specific role from the IAM (Invoke Other Lambda Function) and then calls another lambda function – the ChildFunction with a payload. Once the execution of the ChildFunction is completed, it returns a response, which is then passed on to the ParentFunction. The ParentFunction receives the response and handles the job accordingly.

As in this example, let us assume that the ParentFunction is going to call the ChildFunction with a payload of ProductName, Quantity, and the UnitPrice of that product. The ChildFunction, in turn, will process this payload, calculate the total sales amount, generate a transaction reference ID, and return this information to the ParentFunction.

Creating the first AWS Lambda Function – ChildFunction

Let us first go ahead and create the ChildFunction, which will process the input payload and return the results to the ParentFunction.

#aws rds #functions #aws #lambda function

Deploy script for AWS Lambda (in TypeScript)

In this video we create a deployment script for AWS Lambda to automate the lambda deployment process.

The script:

• Compiles and bundles our TypeScript code to javascript using https://github.com/zeit/ncc

#aws lambda #aws #lambda #typescript

Lambda, Map, Filter functions in python

Welcome to my Blog, In this article, we will learn python lambda function, Map function, and filter function.

Lambda function in python: Lambda is a one line anonymous function and lambda takes any number of arguments but can only have one expression and python lambda syntax is

Syntax: x = lambda arguments : expression

Now i will show you some python lambda function examples:

#python #anonymous function python #filter function in python #lambda #lambda python 3 #map python #python filter #python filter lambda #python lambda #python lambda examples #python map