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dart

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  1. 1

    7 Flutter App Patterns Worth Copying Into Your Next App

    What a survey of my Riverpod + go_router app says to keep, and what to fix before you paste it My test harness has a doc comment that says (in Korean) it initializes ProviderScope, ScreenUtilInit and EasyLocalization. It does not wrap anything in EasyLocalization. Screen tests that use it had been running without…

    EN2026-10-19

  2. 2

    Upgrading to Flutter 3.47 Broke 4 Things in My App: The Checklist I Wish I'd Had

    Three failed loudly, one failed silently, and one of the loud ones was hiding in generated code On 2026-10-03 I opened my Flutter app under Flutter 3.47.6 stable for the first time. The app had last been built on an older SDK, and the first thing I saw was not a new feature. It was 111 test files that no longer…

    EN2026-10-18

  3. 3

    A Pub Workspace Can Make an Unpublished Version Look Perfectly Healthy

    I had a federated Flutter plugin whose tests passed, analysis passed, native builds passed, and dependency constraints looked correct. Then pana ran dart pub downgrade and awarded three packages 50 points out of 160. The workflow required 120. The previous score had been 140. Nothing had suddenly become fifty-points…

    EN2026-09-28

  4. 4

    Dart Made Analyzer Plugins Official. Migrating Two Linters Was Not a Package Rename

    Dart 3.10 added an official analyzer plugin system. I maintain two lint packages, so the migration looked almost suspiciously tidy: replace the archived host dependency, rename a few base classes, and enjoy the future. That was the optimistic version. The analyzer had other plans (of course it did). The host was not…

    EN2026-09-27

  5. 5

    A Source Transformer Should Be Allowed to Say No

    The most reassuring response from a source-editing tool is not always a successful edit. Sometimes it is: “There is no safe value at this cursor position.” That sounds like a disappointing feature. A keyboard shortcut was pressed; surely the extension should do something. But automatic edits have an awkward property:…

    EN2026-09-25

  6. 6

    A Lint Rule That Matches Nothing Is Not Green

    A custom lint rule can compile, execute, report zero diagnostics, and be completely broken. That is the unpleasant lesson behind many static-analysis migrations. A removed API causes a useful red build. The obvious repair makes the project compile again. Then a changed query, stale type name, or weakened library check…

    EN2026-09-15

  7. 7

    A Debug Log Is Not Allowed to Run Your Code

    Debug logging is supposed to observe a program. That sounds too obvious to deserve a rule. Then put a cursor on prefs in this line and ask a source-editing tool to “log what is under the cursor”: What should it insert? If the tool expands the selection to the widest nearby expression, it may generate this:…

    EN2026-08-12

  8. 8

    Eight Review Findings, One Root Cause: What `merry init` Taught Me About Paths

    I shipped a setup command. The reviewer found eight problems with it. Four of them were the same problem. I maintain merry, a small Dart CLI that lets you define script shortcuts in pubspec.yaml and run them with merry build instead of typing the whole command. It's a maintained fork of derry. Nothing exotic. The one…

    EN2026-08-06

  9. 9

    staticElement Is Gone in analyzer 8.x — Ask the Return Type Instead

    If you maintain a custom lint rule for Dart and you have been putting off the analyzer 8.x bump, here is the thing that will stop your build, and the shape of the fix. SimpleIdentifier.staticElement was removed. Not deprecated with a grace period you can ignore for two more releases — removed. Rule code that reaches…

    EN2026-08-03

  10. 10

    Teaching Your IDE to Show Icons: Inline SVG Previews in Dartdoc Comments

    Autocomplete on an icon font is a very specific kind of comedy. You type LucideIcons. and the IDE proudly offers you 2,023 options with names like pencilSparkles, beefOff, and squirrel. Which of these is the icon you saw in the design mock? No idea. Alt-tab to lucide.dev, search, squint, alt-tab back, pick,…

    EN2026-07-18

  11. 11

    Why 45992700 Is Not 459927: Longest-Prefix-First BIN Matching for Korean Cards

    Here is a small quiz. A user in Seoul types a card number that starts with 4599 2700. Your card-type detector looks at it and says, confidently: Visa. Is it wrong? No. Is it useful? Also no. In the Korean payments context, "Visa" is barely the beginning of the question. Which issuer — 신한카드? 현대카드? Is it a credit card…

    EN2026-07-18

  12. 12

    Publishing to pub.dev With Zero Stored Secrets: OIDC and Per-Package Tags for a Federated Flutter Plugin

    Every CI publishing pipeline I have ever set up began the same way: generate a long-lived token on the registry website, paste it into the repo's secret store, and promise myself I'd rotate it someday. (Narrator: he did not rotate it.) I've paid for that pattern before. On an earlier npm project, my tag-driven publish…

    EN2026-07-18