Thoughts on software engineering, leadership, and technology.https://dejan.vasic.com.au/en-ushttps://dejan.vasic.com.au/blog/2025/11/solving-optimistic-update-race-conditions-in-sveltekit/https://dejan.vasic.com.au/blog/2025/11/solving-optimistic-update-race-conditions-in-sveltekit/How I fixed race conditions in my notes app by implementing a request queue at the network layer instead of managing state-level complexity.Sun, 02 Nov 2025 00:00:00 GMTsveltesveltekittypescriptoptimistic updateshttps://dejan.vasic.com.au/blog/2025/10/my-svelte-claude-md-instructions/https://dejan.vasic.com.au/blog/2025/10/my-svelte-claude-md-instructions/A basic CLAUDE.md file can go a long way in improving your Svelte project.Mon, 20 Oct 2025 00:00:00 GMTsveleteclaudedeveloper toolinghttps://dejan.vasic.com.au/blog/2025/07/my-honest-take-on-AI-developer-tooling/https://dejan.vasic.com.au/blog/2025/07/my-honest-take-on-AI-developer-tooling/Anthropic is hitting the notes and leading the race when it comes to developer tooling. Since the beginning of this year I found myself using AI more frequently in different forms and so I decided to write a short opinion piece about it.Wed, 09 Jul 2025 00:00:00 GMTaiclaudesonnetgithub copilothttps://dejan.vasic.com.au/blog/2025/06/avoidoing-any-keyword-in-typescript/https://dejan.vasic.com.au/blog/2025/06/avoidoing-any-keyword-in-typescript/Using the any type in TypeScript tests can lead to less maintainable and error-prone code. Let's explore how to avoid it and improve our test quality.Wed, 04 Jun 2025 00:00:00 GMTtypescripttestingzodzod-mockfakerhttps://dejan.vasic.com.au/blog/2025/04/displaying-toast-messages-in-svelte-5/https://dejan.vasic.com.au/blog/2025/04/displaying-toast-messages-in-svelte-5/Toast messages are a lovely addition to any interface whether it's your Operating System, mobile or web application.Sun, 06 Apr 2025 00:00:00 GMTsveltesvelte-kitfront-endtypescriptmelt-uihttps://dejan.vasic.com.au/blog/2024/12/creating-custom-svelte-component-with-children-props-in-typescript/https://dejan.vasic.com.au/blog/2024/12/creating-custom-svelte-component-with-children-props-in-typescript/Typing children props in Svelte 5Sat, 14 Dec 2024 00:00:00 GMTsveltetypescriptfront-endhttps://dejan.vasic.com.au/blog/2024/03/sveltekit-with-auth0-integration/https://dejan.vasic.com.au/blog/2024/03/sveltekit-with-auth0-integration/A guide to integrating Auth0 with SvelteKit for authentication.Sun, 03 Mar 2024 00:00:00 GMTsveltesvelte-kitauth0oauth2typescripthttps://dejan.vasic.com.au/blog/2024/02/nextjs-ssr-with-react-hook-form-not-found-issue/https://dejan.vasic.com.au/blog/2024/02/nextjs-ssr-with-react-hook-form-not-found-issue/A deep dive into the 'Form Not Found' issue in Next.js applications using React Hook Form, and how to resolve it effectively.Thu, 29 Feb 2024 00:00:00 GMTnextjsreactreact-hook-formserver-actionshttps://dejan.vasic.com.au/blog/2023/12/my-journey-into-functional-programming-with-kotlin-and-svelte-kit/https://dejan.vasic.com.au/blog/2023/12/my-journey-into-functional-programming-with-kotlin-and-svelte-kit/Functional programming in Typescript with fp-ts and Svelte Kit.Sun, 10 Dec 2023 00:00:00 GMTsveltetypescriptfp-tsfunctional programminghttps://dejan.vasic.com.au/blog/2023/11/asserting-either-in-vitest/https://dejan.vasic.com.au/blog/2023/11/asserting-either-in-vitest/"Enhancing TypeScript testing with custom matchers for FP-TS Either objects in Vitest."Sat, 11 Nov 2023 00:00:00 GMTvitesttypescriptfp-tsfunctional programminghttps://dejan.vasic.com.au/blog/2022/05/next-images-in-storybook/https://dejan.vasic.com.au/blog/2022/05/next-images-in-storybook/Displaying Nextjs Image component in StorybookSun, 08 May 2022 00:00:00 GMTnextjsstorybookreacthttps://dejan.vasic.com.au/blog/2022/02/query-graphql-in-nextjs-and-ssr-rehydration/https://dejan.vasic.com.au/blog/2022/02/query-graphql-in-nextjs-and-ssr-rehydration/SSR Data hydration and Querying GraphQL in Nextjs with ApolloMon, 28 Feb 2022 00:00:00 GMTgraphqlapollonextjsssrhttps://dejan.vasic.com.au/blog/2021/10/next-getserversideprops-high-order-function-in-typescript/https://dejan.vasic.com.au/blog/2021/10/next-getserversideprops-high-order-function-in-typescript/Have you needed to reuse some code for Next pages in particular within the server side function getServerSideProps?Wed, 27 Oct 2021 00:00:00 GMThocnextjsreacthttps://dejan.vasic.com.au/blog/2021/08/epic-react-course-key-takeaways/https://dejan.vasic.com.au/blog/2021/08/epic-react-course-key-takeaways/Learning react hooks and patterns from Kent C Dodds Epic React courseMon, 23 Aug 2021 00:00:00 GMTreactreact-hookseducationhttps://dejan.vasic.com.au/blog/2021/04/auth0-and-apollo-graphql-handling-token-expiry/https://dejan.vasic.com.au/blog/2021/04/auth0-and-apollo-graphql-handling-token-expiry/Handling token expiry with Auth0 and Apollo GraphQLSun, 18 Apr 2021 00:00:00 GMTapolloauth0graphqljwtreacthttps://dejan.vasic.com.au/blog/2020/12/ant-design-async-validation/https://dejan.vasic.com.au/blog/2020/12/ant-design-async-validation/How to perform async server-side validation for unique phone/email fields in Ant Design forms using Apollo GraphQL.Mon, 21 Dec 2020 00:00:00 GMTant-designformsgraphqlreactserver-side-validationvalidationhttps://dejan.vasic.com.au/blog/2020/09/ant-design-upload-to-s3-bucket-and-graphql/https://dejan.vasic.com.au/blog/2020/09/ant-design-upload-to-s3-bucket-and-graphql/How to use Ant Design's Upload component to upload files to AWS S3 with GraphQL and signed URLs.Thu, 10 Sep 2020 00:00:00 GMTant-designawsgraphqlreacts3https://dejan.vasic.com.au/blog/2020/08/serving-react-spa-in-koa/https://dejan.vasic.com.au/blog/2020/08/serving-react-spa-in-koa/Serving a React SPA and static sites with Koa and handling client-side routing.Sat, 22 Aug 2020 00:00:00 GMTreactkoaspagraphqlhttps://dejan.vasic.com.au/blog/2020/06/circleci-and-heroku-orb/https://dejan.vasic.com.au/blog/2020/06/circleci-and-heroku-orb/How to use the Heroku Orb in CircleCI to deploy and set build numbers as environment variables.Tue, 23 Jun 2020 00:00:00 GMTcircleciherokuhttps://dejan.vasic.com.au/blog/2020/06/react-typescript-and-ant-design/https://dejan.vasic.com.au/blog/2020/06/react-typescript-and-ant-design/A lean React + TypeScript + Ant Design boilerplate with theming and modern tooling.Fri, 05 Jun 2020 00:00:00 GMTant-designantdesignboilerplatereacttemplatethemingtypescriptwebpackhttps://dejan.vasic.com.au/blog/2020/04/sequelize-5-with-typescript/https://dejan.vasic.com.au/blog/2020/04/sequelize-5-with-typescript/Using Sequelize v5 with TypeScript for Postgres, including model setup and type safety tips.Sun, 05 Apr 2020 00:00:00 GMTJavaScriptPostgresSequelizetypescripthttps://dejan.vasic.com.au/blog/2020/01/ynab-you-really-do-need-a-budget/https://dejan.vasic.com.au/blog/2020/01/ynab-you-really-do-need-a-budget/Personal budgeting lessons and strategies using the YNAB app.Wed, 15 Jan 2020 00:00:00 GMTAPIBanksBudgetingFinancesoftwareYNABhttps://dejan.vasic.com.au/blog/2020/01/unit-of-work-with-node-mssql-and-typescript/https://dejan.vasic.com.au/blog/2020/01/unit-of-work-with-node-mssql-and-typescript/Implementing a unit of work pattern for atomic transactions in Node.js with TypeScript and MSSQL.Fri, 03 Jan 2020 00:00:00 GMTjavascriptlambdanodetypescripthttps://dejan.vasic.com.au/blog/2019/11/managing-postgres-database-locally-with-docker/https://dejan.vasic.com.au/blog/2019/11/managing-postgres-database-locally-with-docker/How to use Docker to run and manage a local Postgres database for development.Thu, 07 Nov 2019 00:00:00 GMTdevelopmentdockerPostgreshttps://dejan.vasic.com.au/blog/2019/11/golang-logging-with-correlation-id/https://dejan.vasic.com.au/blog/2019/11/golang-logging-with-correlation-id/Correlating API logs in Go using correlation/request IDs for better traceability.Fri, 01 Nov 2019 00:00:00 GMTAPIBestPracticesCorrelationIDGolangLoggingMicroserviceaRequestIDhttps://dejan.vasic.com.au/blog/2019/01/paging-in-postgres-and-java/https://dejan.vasic.com.au/blog/2019/01/paging-in-postgres-and-java/Paging is a common problem in large datasets. Here is a simple solution using Postgres and Java.Thu, 03 Jan 2019 00:00:00 GMTpostgrespagingjavahttps://dejan.vasic.com.au/blog/2015/02/angularjs-password-strength-with-bootstrap/https://dejan.vasic.com.au/blog/2015/02/angularjs-password-strength-with-bootstrap/Building a password strength indicator using AngularJS and BootstrapSat, 07 Feb 2015 00:00:00 GMTangularjspasswordbootstraphttps://dejan.vasic.com.au/blog/2013/12/javascript-file-upload-chunking-with-jquery/https://dejan.vasic.com.au/blog/2013/12/javascript-file-upload-chunking-with-jquery/Uploading is not easy and chunking is even harder. Here is a simple solution using JQuery and Bootstrap progress bar.Tue, 03 Dec 2013 00:00:00 GMTjqueryjavascriptuploadchunkingprogress barbootstraphttps://dejan.vasic.com.au/blog/2013/03/generating-full-content-url-in-asp-mvc/https://dejan.vasic.com.au/blog/2013/03/generating-full-content-url-in-asp-mvc/Absolute URL generation in ASP.NET MVCTue, 26 Mar 2013 00:00:00 GMTasp.netmvcurl