Over the years and throughout my career, I have written a lot of code in various languages, such as PHP, Python, Javascript, Typescript, Dart, Java, Go, Clojure, and more. All these languages are equally good and have unique aspects that make you approach problem-solving in a certain way.

One concept seems to appear frequently, often in a rather basic manner but in fact quite complicated: Union Types. Some languages naturally support them; in others, it may seem like an impossible task.

In this article, we will be diving deep into Union Types (Untagged and Tagged Unions)—what they are, why they’re helpful, where they fall short, and why, in strongly typed languages like Dart, you might want to reconsider their use. To convey my message better, I will write examples from different languages, including Typescript, F#, PHP, and more.

Without further ado, let’s get started.

Today we’re excited to announce the release of DCM 1.25.0!

This release includes 14 new rules (9 for Bloc), additional filters and estimated effort for "dcm init preview", support for adding new seats directly from the DCM Teams Console, and more UX improvements! 🚀

Plus, starting from this version, all rules for Bloc are now included into our Free plan!

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)

Today we’re excited to announce the release of DCM 1.24.0!

This release includes 17 new rules (6 for Bloc and 4 for Flutter), autocompletion for DCM configuration in analysis_options.yaml, improved validation of rules and metrics in DCM configuration, a new type of fixes called "unsafe fixes" and more! 🚀

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)

Since 2006, when I started working in software development, I have faced the problem of memory leaks, particularly when using languages like Dart. The integration of Streams and asynchronous programming as a default feature in Dart introduces a level of difficulty in addressing this matter.

Memory leaks can be annoying as they are hard to spot and recreate compared to syntax errors or logic bugs that usually show up in the development phase. When it comes to memory leaks in Flutter applications, it's getting even more complex with the addition layers of widgets and controllers combined with listeners over time which may result performance issues or unexpected crashes for users after prolonged use.

Unfortunately, identifying all memory leaks isn't always straightforward when it comes to analysis since memory usage can vary based on runtime behavior patterns; nevertheless, tools like DCM and its Rules can sometimes help detect patterns that lead to memory leaks and prevent such issues.

In this article, we will explore Dart and Flutter memory leaks, how they occur, their significance in coding practices, solution to debug memory leaks and identify them such as DevTools and Leak Tracker and shifting left by relying on static analyzer tools such DCM and how they can prevent such leaks from sneaking into your code base.

Today we’re excited to announce the release of DCM 1.23.0!

This release includes 9 new rules, 9 new quick fixes for existing rules, new command for analyzing assets for various issues, detection of duplicate test cases, reworked rules documentation and much more! 🚀

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)

Today we’re excited to announce the release of DCM 1.22.0!

This release includes 15 new rules, DCM Teams Console improvements, ignore comment support for pubspec rules and the first version of our public roadmap.

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)

At DCM, we understand the importance of maintaining a high-quality codebase, especially in a project as widely used as the Wolt Modal Sheet package. This package provides developers with a powerful tool for implementing responsive modals with multiple pages, smooth transitions, and scrollable content within Flutter applications. However, as projects grow and evolve, ensuring code consistency and catching potential bugs early becomes increasingly critical, particularly when maintaining an open-source project that receives multiple pull requests from different contributors.

Before we start, we'd like to mention that we offer a free OSS license for Dart and Flutter open-source packages. Check out our pricing and contact us by clicking the "Looking for OSS license?" button.

In this guide, we will walk you through the process of integrating DCM into the Wolt Modal Sheet package, covering everything from the initial setup to configuring CI pipelines and addressing code issues.

Today we’re excited to announce the release of DCM 1.21.0!

This release includes 9 new rules, a reworked "banned-usage" rule, a new reporter format for SonarQube, a new "Guides" section in the documentation, and general UX improvements 🚀.

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)

Code reviews are integral to the software development lifecycle, crucial in maintaining code quality and promoting team collaboration. In this blog, I want to explore the importance of code reviews, tools, and practices to enhance the code review process and emphasize best practices specific to Dart and Flutter development. We will also discuss advanced concepts like "Shifting Left" to integrate reviews earlier in the development cycle, minimizing issues before they propagate.

There's a prevailing myth in software development that less code is always better. While concise code can benefit specific contexts, it doesn't necessarily equate to better code. Code quality, maintainability, and readability are often far more important than simply being less.

This article will explore why writing more code can often lead to better software, especially in Dart and Flutter applications. We'll focus on clarity, modularity, flexibility, robustness, and error handling. We'll also discuss the drawbacks of "magic" code and the importance of linting and rules in maintaining code quality.

Today we’re excited to announce the release of DCM 1.19.0!

This release includes 9 new rules (4 for Riverpod), proper support for codegen packages by the check-dependencies command, new summary output to sdterr for various reporters, new visualization of the statically resolved widget trees for analyze-widgets, new fix type for removing unused files (moved from check-unused-files), documentation updates and other DX improvements! 🚀

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)

Maintaining consistent and high-quality code is necessary in the fast-paced software development world, especially in Flutter and Dart projects, as they are known for being speedy tools. Continuous Integration (CI) has emerged as a crucial practice that helps development teams achieve this goal. CI provides rapid feedback by integrating code frequently and automating various aspects of the development process, allowing teams to identify and rectify issues early.

This article explores the significance of CI in enforcing code quality and consistency, the role of lint tools, especially DCM, and practical examples of integrating these tools with CI pipelines.

Today we’re excited to announce the release of DCM 1.18.0!

This release includes 8 new rules, improved "New Version" notifications, new grouping option for IntelliJ plugin, automatic DCM version detection by the "setup-dcm" action and general UX improvements 🚀.

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)

On any real-world Flutter project (but any project, really...), you want to run an analyzer and a linter at some point to ensure your quality matches the baseline your team agreed on. If you've been following me for some time, you might know that I love a promising CI/CD pipeline (heck, I even wrote a series on the topic 🙃). I always recommend running these checks in your CI pipeline.

Today we’re excited to announce the release of DCM 1.17.0!

This release includes 9 new rules (3 for Riverpod 🔥), early access to the DCM Teams license management portal, per-package monorepo mode, global configuration with DCM version constrains and more 🚀.

Let's go through the highlights of this release! (And you can find the full list of changes in our changelog)