--- title: TYPO3 adopts Symfony’s dependency injection container in v10 url: "https://b13.com/knowledge/we-love-dependency-injection-in-typo3-v10" description: Dependency injection in TYPO3 v10 makes code easier to maintain, test, read, and extend. Another reason to upgrade to the latest version. image: "https://b13.com/fileadmin/_processed_/7/6/csm_dependency-injections_191-1_07a143d8fa.png" date: 2020-06-17 modified: 2026-08-19 lastUpdated: 2026-08-19 --- # TYPO3 adopts Symfony’s dependency injection container in v10 [ TYPO3v10 ](https://b13.com/knowledge/typo3v10) We Love Dependency Injection in TYPO3 v10 =========================================== ![](https://b13.com/fileadmin/_processed_/d/e/csm_daniel_goerz_2eed6f34a2.jpg)Daniel Goerz 17 June 2020 [ RSS Feed ](https://b13.com/rss.xml) ![A person wearing a yellow shirt labeled "INJECTOR" is pouring liquid from two bottles into a glass, surrounded by a backdrop of various bottles.](https://b13.com/fileadmin/_processed_/f/1/csm_dependency-injections_a7619f741c.webp) Dependency injection (DI) makes code easier to maintain, test, read and extend. Until now, in TYPO3, it’s only been available in Extbase context, not in the rest of core. From TYPO3 v10, the widely adopted Symfony implementation is part of core and Extbase. It’s yet another reason to upgrade to the latest version. What is dependency injection? ------------------------------- DI is a software architecture concept that avoids tightly coupling objects to their dependencies. For example, if your application needs to send email newsletters, the part that’s responsible for sending emails doesn’t need to hard-code the service used for transport. Instead, whoever instantiates the object can decide what email service to use and “inject” this dependency as a parameter. If they (or someone else) decide to use another service later on, they can inject this instead of rewriting the code. ![Diagram illustrating a dependency injection concept, featuring an "INJECTOR" at the top, with arrows indicating that it injects dependencies into "CLASS A" and "CLASS B," where "CLASS A" uses "CLASS B."](https://b13.com/fileadmin/_processed_/6/0/csm_DI-figure_5a4f58d879.webp) Separation of concerns—do one job well ---------------------------------------- This supports the separation of concerns, whereby services are dedicated to doing a single, well defined, job well while outsourcing anything else to dependencies. With applications getting larger all the time, this helps break down complex into small, bite-sized chunks. Another advantage for devs is that dependency injection makes testing easier: a technique known as mocking enables us to pass a dummy object to simulate various scenarios. So to continue the newsletter example, you don’t have to send out emails to test what happens when emails bounce. Instead, you can simulate that behaviour by injecting a dummy object instead of the transport service. The dummy object can then return whatever success or error codes you want to test against. As mentioned above, DI also makes it easier for devs to swap out components later on. You don’t have to rewrite code but can just pass in a different service if you need to change it. Symfony components flatten TYPO3’s learning curve --------------------------------------------------- The big news around DI in TYPO3 core isn’t just DI itself, but the fact we chose to use Symfony rather than extending our existing implementation from Extbase to core. Relying on Symfony components has several advantages for TYPO3 users. It’s familiar to a wider range of coders, so it helps agencies find staff because the learning curve is flattened and the pool of suitable candidates is larger. Another boon: Symfony, including dependency injection, is already excellently documented, and documentation is central to great developer experience. So all in all, not reinventing the wheel but using an already existing and proven solution enables the TYPO3 community and contributors to focus more on the CMS aspects of TYPO3. DI in production at b13 ------------------------- We were really keen for Symfony’s DI container to be available across TYPO3, so it’s unsurprising we’re already using it in production. In one project, I configured the CacheManager as a factory in my services.yaml so that the correct CacheFrontend was injected into my controller so that I did not have to get it on my own. More details about this can be found in my [blog post](https://usetypo3.com/di-and-events-example.html) about the implementation. What are you waiting for? Time to upgrade to v10 -------------------------------------------------- With time, more of core will be refactored to leverage dependency injection. Extensions can use it too, instead of TYPO3’s own DI they used previously. Ultimately, Symfony’s DI will replace DI in Extbase, so it’s a good idea to upgrade and write new code for v10 to save yourself rewriting it in the future. Dependency injection is just one more example of how TYPO3 v10 is a big step in keeping our favourite CMS state of the art. Upgrade as soon as you can to get the best experience for your devs, editors, and customers so you don’t have to rewrite your code later. Get a quote for upgrading to TYPO3 v10 ---------------------------------------- [ Let’s connect ](https://b13.com/lets-connect) ### Written by: ![Bild von Daniel Goerz](https://b13.com/fileadmin/_processed_/d/e/csm_daniel_goerz_9a279a5f6a.webp) Daniel has been an integrated presence in our workday since he joined us remotely from Berlin in 2018. When not engaged in his geeky hobbies, we usually find him helping someone somewhere. His essential tool: The Internet Daniel Goerz Development [ more from Daniel Goerz ](https://b13.com/team/daniel-goerz) Related Articles ------------------ - ![A yellow user interface panel featuring multiple sections and tabs, set against a dark green background with abstract shapes and gears. The panel includes placeholders for text and checkboxes.](https://b13.com/fileadmin/_processed_/9/e/csm_Dashboard_63f98a27c9.webp) ### Optimize your daily workflow with the TYPO3 dashboard 30 March 2021 | Oliver Bartsch The TYPO3 dashboard is geared towards maximum extensibility. Discover the benefits, take a tour under the hood and find out how to build your own custom widgets. 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[ Read more: Auto-updated redirects: A feature to convince you to upgrade TYPO3 ](https://b13.com/knowledge/auto-slug-update-typo3-v10) - ![A person wearing a beret and a fringed poncho waves goodbye to a steam train, surrounded by stylized smoke and a dark background.](https://b13.com/fileadmin/_processed_/3/c/csm_Deprecations_f2863dfb8d.webp) ### Deprecations and breaking changes to celebrate in TYPO3 v10 18 August 2020 | Michael Semle These changes keep TYPO3 awesome. They’re worth the effort it takes to adapt! [ Read more: Deprecations and breaking changes to celebrate in TYPO3 v10 ](https://b13.com/knowledge/deprecations-and-breaking-changes-to-celebrate-in-typo3-v10) - ![A person holds two large signs displaying the word "EVENT" in bold letters. 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