https://lukaszgandecki.com Latest writing on AI engineering, knowledge tools, and developer experience by Łukasz Gandecki. https://lukaszgandecki.com/blog/2026-year-of-convex After years of searching for the perfect database solution, I finally found Convex - the database I always wanted. Here's why I'm going all-in. Wed, 14 Jan 2026 00:00:00 GMT https://lukaszgandecki.com/blog/introducing-sessions A custom video player for time-traveling through coding sessions with activity tracking. Tue, 02 Dec 2025 00:00:00 GMT https://lukaszgandecki.com/blog/site-improvements-mobile-first Site should look good on mobile devices now. Mon, 17 Nov 2025 00:00:00 GMT https://lukaszgandecki.com/blog/launching-personal-space Excited to start sharing my thoughts, ideas, and experiences with the world again. Wed, 29 Oct 2025 00:00:00 GMT https://lukaszgandecki.com/blog/add-types-to-your-aws-lambda-handler Lambdas handlers can be invoked with many different, but always complex, event arguments. Wed, 28 Jul 2021 00:00:00 GMT https://lukaszgandecki.com/blog/how-to-expose-a-local-service-to-the-internet From time to time you might need to expose your locally running service to the external world Sat, 17 Jul 2021 00:00:00 GMT https://lukaszgandecki.com/blog/for-loops-in-javascript-vs---times From time to time I still see a for loop in JavaScript codebases. Linters are frequently angry about them. Tue, 29 Jun 2021 00:00:00 GMT https://lukaszgandecki.com/blog/sharing-scalars-between-modules-with-chimp Now, starting with version chimp@4.1.2 if you just want to use a scalar in a given module, but do not want to redefine it, use @predefined directive. Mon, 28 Jun 2021 00:00:00 GMT https://lukaszgandecki.com/blog/adding-typescript-to-the-official-apollo-server-example I go through the preparation of the official Apollo Platform Tutorial App for adding Chimp to it. Fri, 30 Apr 2021 00:00:00 GMT https://lukaszgandecki.com/blog/aws-cdk-lambda-dynamodb-dependency Managing dependencies between Lambdas and DynamoDB tables can get ugly. Tue, 27 Apr 2021 00:00:00 GMT https://lukaszgandecki.com/blog/tsx-and-multiline-arguments-support We've just released a new version of the cypress-cucumber-preprocessor package. Thu, 22 Apr 2021 00:00:00 GMT https://lukaszgandecki.com/blog/chimp-4-0-resolvers-for-extended-federated-types We've noticed that resolver was frequently unused and left a significant amount of unnecessary code in projects Tue, 06 Apr 2021 00:00:00 GMT https://lukaszgandecki.com/blog/better-way-to-use-usereducer-with-typescript Introducing useComplexState hook, a small wrapper combining Redux Toolkit, useReducer with some extra syntax sugar to make things even simpler and more to the point. Tue, 30 Mar 2021 00:00:00 GMT https://lukaszgandecki.com/blog/dealing-with-randomness-in-tests How to work with dates and other non-deterministic variables. Thu, 25 Mar 2021 00:00:00 GMT https://lukaszgandecki.com/blog/dreaded-yarn-link-theres-already-a-package-called-x-registered If you work on independent packages (or maybe even open-source npm modules - in which case I salute you!), you probably use the link functionality. Thu, 25 Mar 2021 00:00:00 GMT https://lukaszgandecki.com/blog/choosing-between-use-state-and-use-reducer Watch me go through the advantages and disadvantages of different ways of using hooks for dealing with state in React. Thu, 18 Mar 2021 00:00:00 GMT https://lukaszgandecki.com/blog/federation-example-updated-to-chimp-3-0 We are happy to announce that the example showing many advanced patterns related to GraphQL usage is updated to Chimp 3.0 Tue, 23 Feb 2021 00:00:00 GMT https://lukaszgandecki.com/blog/rapid-prototyping-with-javascript A video about rapid prototyping with JavaScript Tue, 23 Feb 2021 00:00:00 GMT https://lukaszgandecki.com/blog/adding-chimp-3-to-an-existing-application This article is based on my notes from adding chimp to an existing app Fri, 12 Feb 2021 00:00:00 GMT https://lukaszgandecki.com/blog/how-to-fix-the-annoying-ensure-there-is-only-one-instance-of-graphql-error If you have been doing serious work with GraphQL over the last few years, you surely saw this error at one time or another Fri, 12 Feb 2021 00:00:00 GMT https://lukaszgandecki.com/blog/updating-from-chimp-2-to-3 We've rewritten Chimp to use TypeScript and the fantastic CLI Framework called Oclif. Sun, 31 Jan 2021 00:00:00 GMT https://lukaszgandecki.com/blog/how-to-deal-with-inferred-typescript-types-and-stop-using-any What do you do when you are in need to figure out a complex type? Fri, 15 Jan 2021 00:00:00 GMT https://lukaszgandecki.com/blog/how-to-never-add-webstorm-idea-folder-to-git-ever-again Frequently when you work with an open-source repository you might accidentally commit your .idea folder to it. Sun, 10 Jan 2021 00:00:00 GMT https://lukaszgandecki.com/blog/how-to-pass-a-class-to-a-function-in-typescript An example of passing a class to a function in TypeScript Fri, 08 Jan 2021 00:00:00 GMT https://lukaszgandecki.com/blog/testing-with-dynamodb-toolbox To do integration tests with your DynamoDB Toolbox setup, it's important to be able to run tests in isolations. Wed, 30 Dec 2020 00:00:00 GMT https://lukaszgandecki.com/blog/creating-tables-with-dynamodb-toolbox I'm playing around with DynamoDB Toolbox, and one thing that wasn't clear in my mind was how do I actually create a table using the definitions I made using Toolbox. Tue, 29 Dec 2020 00:00:00 GMT https://lukaszgandecki.com/blog/instantly-update-lambda-functions Deploying the whole stack whenever you want to check your changes is tiresome and boring. Fri, 27 Nov 2020 00:00:00 GMT https://lukaszgandecki.com/blog/centralize-your-aws-lambda-errors Having multiple independent lambda functions is great, but it comes with a price of difficult monitoring. Wed, 25 Nov 2020 00:00:00 GMT https://lukaszgandecki.com/blog/make-oh-my-zsh-play-nicely-with-webstorm-intellij Disappearing history entries were bugging me for a long time. I would try to look for a command that I KNEW I recently typed, but it was gone. Sun, 22 Nov 2020 00:00:00 GMT https://lukaszgandecki.com/blog/typescript-aws-lambda-cdk-with-ease We wanted the TypeScript Lambda experience to be seamless - if a developer wants to create a new function, he should create a typescript file, add it to CDK and that's it. Fri, 20 Nov 2020 00:00:00 GMT https://lukaszgandecki.com/blog/dynamodb-nodejs-testing-tool DynamoDB is a fantastic database, but so far it misses a nice abstraction that would make you more confident that the code you write is correct. Sat, 31 Oct 2020 00:00:00 GMT https://lukaszgandecki.com/blog/chimp-v2-3-0-released-custom-prefixes-for-monorepos With the new version chimp allows you to set up custom prefixes for your chimp apps. Mon, 26 Oct 2020 00:00:00 GMT https://lukaszgandecki.com/blog/how-to-mock-files-with-testdouble-typescript-and-jest Let's assume a structure of two files, first a file with a function that calls a separate function and performs some logic based on the information received Wed, 21 Oct 2020 00:00:00 GMT https://lukaszgandecki.com/blog/why-so-loud-jest With this tiny plugin, you will be able to see ONLY RELEVANT console messages. Fri, 16 Oct 2020 00:00:00 GMT https://lukaszgandecki.com/blog/generate-your-apollo-datasources-2 Using GraphQL as your aggregation layer for your microservices is great, but writing all the code for connecting to them is not. Mon, 28 Sep 2020 00:00:00 GMT https://lukaszgandecki.com/blog/comparison-of-the-graphql-workflow-with-without-chimp Let's take a look at how using chimp can benefit your workflow when working on GraphQL Apollo Server. Sun, 27 Sep 2020 00:00:00 GMT https://lukaszgandecki.com/blog/vue-storybook-with-apollo One day you might decide your app became so large that it would be great to develop smaller chunks of it in isolation Fri, 11 Sep 2020 00:00:00 GMT https://lukaszgandecki.com/blog/adding-semantic-release-to-an-old-babel-plugin-live-2-2 In the second part of the live coding with babel-plugin-ignore-html-and-css-imports package, I'm adding the Semantic Release through Github Actions to it. Thu, 27 Aug 2020 00:00:00 GMT https://lukaszgandecki.com/blog/working-with-legacy-code-feature-for-ibm-in-an-old-babel-plugin-live-1-2 In this episode, I'm adding some tests to an old babel-plugin-ignore-html-and-css-imports package. Tue, 25 Aug 2020 00:00:00 GMT https://lukaszgandecki.com/blog/how-to-reset-local-git-repository-without-cloning-again Remove all untracked/ignored files and directories excluding .idea and .vscode folders, list things to remove, and ask for confirmation first. Fri, 21 Aug 2020 00:00:00 GMT https://lukaszgandecki.com/blog/let-s-make-the-apollo-federation-demo-testable Taking this opportunity, I'm excited to introduce a package that I hope will make it much easier to test your precious services — federation-testing-tool Wed, 05 Jun 2019 00:00:00 GMT