Notes on web technologies, engineering tradeoffs, and front-end architecture.https://www.echooff.devhttps://www.echooff.dev/blog/application-performance-is-a-product-requirementhttps://www.echooff.dev/blog/application-performance-is-a-product-requirementApplication performance is not something engineers can optimize in isolation. It is a product decision, a requirement and a trade-off that has to be made explicit.Sun, 10 May 2026 07:10:00 GMThttps://www.echooff.dev/blog/developer-experience-is-a-performance-featurehttps://www.echooff.dev/blog/developer-experience-is-a-performance-featureOptimizing developer experience often has a bigger long-term impact than optimizing rendering benchmarks or bundle size. Faster engineers build better software.Sat, 09 May 2026 05:22:00 GMThttps://www.echooff.dev/blog/pattern-matching-in-typescript-todayhttps://www.echooff.dev/blog/pattern-matching-in-typescript-todayJavaScript does not have pattern matching yet, but TypeScript developers can model states clearly and use ts-pattern for exhaustive pattern matching today.Fri, 01 May 2026 07:09:00 GMThttps://www.echooff.dev/blog/stop-using-barrel-exports-javascripthttps://www.echooff.dev/blog/stop-using-barrel-exports-javascriptBarrel exports in JavaScript reduce tree shaking effectiveness, hide dependencies and make code harder to maintain. Learn why you should avoid them.Sat, 25 Apr 2026 07:32:00 GMThttps://www.echooff.dev/blog/avoid-direct-browser-globalshttps://www.echooff.dev/blog/avoid-direct-browser-globalsDirect access to window, document, navigator and globalThis couples your code to the runtime, makes side effects harder to isolate, and leads to brittle tests.Sat, 18 Apr 2026 09:30:00 GMThttps://www.echooff.dev/blog/stop-adding-console-log-use-logpoints-insteadhttps://www.echooff.dev/blog/stop-adding-console-log-use-logpoints-insteadLogpoints let you inspect runtime behavior without changing your code, polluting commits, or pausing execution.Sat, 11 Apr 2026 06:53:00 GMThttps://www.echooff.dev/blog/why-testing-library-is-not-unit-testinghttps://www.echooff.dev/blog/why-testing-library-is-not-unit-testingTesting Library is useful, but rendering components and testing them through the DOM is integration testing, not unit testing.Sun, 05 Apr 2026 14:32:00 GMThttps://www.echooff.dev/blog/why-you-should-not-ship-test-ids-to-production-react-testing-libraryhttps://www.echooff.dev/blog/why-you-should-not-ship-test-ids-to-production-react-testing-libraryReact Testing Library works best with semantic queries like role and label. Shipping data-testid to production hides accessibility problems and turns test-only markup into an accidental contract.Sat, 04 Apr 2026 06:22:00 GMThttps://www.echooff.dev/blog/git-lfs-is-useful-but-it-is-not-a-free-storage-upgradehttps://www.echooff.dev/blog/git-lfs-is-useful-but-it-is-not-a-free-storage-upgradeGit LFS solves a real problem for large binary files, but it also adds workflow and operational complexity that teams should adopt intentionally.Sun, 29 Mar 2026 10:38:00 GMThttps://www.echooff.dev/blog/git-bisect-underrated-featurehttps://www.echooff.dev/blog/git-bisect-underrated-featuregit bisect helps you find the commit that introduced a regression, but large squash merges remove the history that makes it truly effective.Fri, 27 Mar 2026 15:46:00 GMThttps://www.echooff.dev/blog/why-i-do-not-use-enums-in-typescripthttps://www.echooff.dev/blog/why-i-do-not-use-enums-in-typescriptEnums add runtime behavior, work against modern TypeScript workflows, and have simpler alternatives like string literal unions and const objects.Sun, 22 Mar 2026 16:49:00 GMThttps://www.echooff.dev/blog/mutation-testing-typescript-strykerhttps://www.echooff.dev/blog/mutation-testing-typescript-strykerCode coverage shows what your tests execute. Mutation testing shows whether your tests fail when the code is wrong, and where Stryker fits.Thu, 19 Mar 2026 08:03:00 GMThttps://www.echooff.dev/blog/avoid-truthy-falsy-typescripthttps://www.echooff.dev/blog/avoid-truthy-falsy-typescriptTruthy and falsy checks in TypeScript hide intent and can introduce bugs. Prefer explicit checks for the values you actually care about.Sat, 14 Mar 2026 06:22:00 GMThttps://www.echooff.dev/blog/prefer-task-over-promise-typescripthttps://www.echooff.dev/blog/prefer-task-over-promise-typescriptPromises hide failure in an untyped rejection path. Task from true-myth makes asynchronous success and failure explicit in TypeScript.Sat, 07 Mar 2026 09:12:00 GMThttps://www.echooff.dev/blog/avoid-throwing-for-expected-failures-typescripthttps://www.echooff.dev/blog/avoid-throwing-for-expected-failures-typescriptUse Result in TypeScript for expected failures, Maybe for absence, and reserve exceptions for truly exceptional situations.Sat, 07 Mar 2026 07:21:00 GMThttps://www.echooff.dev/blog/avoid-null-typescripthttps://www.echooff.dev/blog/avoid-null-typescriptWhy null still causes bugs in TypeScript - and how Maybe types make absence explicit.Wed, 04 Mar 2026 07:04:00 GMThttps://www.echooff.dev/blog/dependency-injection-without-frameworks-in-typescripthttps://www.echooff.dev/blog/dependency-injection-without-frameworks-in-typescriptExplicit dependencies improve clarity and testability. You do not need a framework to achieve that.Sun, 01 Mar 2026 12:13:00 GMThttps://www.echooff.dev/blog/why-your-unit-tests-feel-fragilehttps://www.echooff.dev/blog/why-your-unit-tests-feel-fragileUnit tests do not feel fragile because testing is hard. They feel fragile because our design mixes business logic and side effects.Sun, 01 Mar 2026 08:58:00 GMThttps://www.echooff.dev/blog/why-i-started-this-bloghttps://www.echooff.dev/blog/why-i-started-this-blogWhy I finally decided to start writing on echooff.dev and what I want this blog to be.Sat, 28 Feb 2026 11:39:00 GMT