--- title: Reviving a 6-year-old Flutter app: the technical... description: A detailed engineering walkthrough of migrating a 6-year-old Flutter e-commerce app (Flushion) to modern standards. Covers upgrading from Dart 2.7 to Dart... canonical: https://daily.dev/posts/reviving-a-6-year-old-flutter-app-the-technical-play-by-play-tbspmmxcq twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Reviving a 6-year-old Flutter app: the technical play-by-play | daily.dev og:description: A detailed engineering walkthrough of migrating a 6-year-old Flutter e-commerce app (Flushion) to modern standards. Covers upgrading from Dart 2.7 to Dart... og:url: https://daily.dev/posts/reviving-a-6-year-old-flutter-app-the-technical-play-by-play-tbspmmxcq og:image: https://api.daily.dev/og/posts/tBSpMmXCq.png og:image:alt: Reviving a 6-year-old Flutter app: the technical play-by-play og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Reviving a 6-year-old Flutter app: the technical play-by-play **[Medium](https://daily.dev/sources/medium_js)** · 8 min read · 0 upvotes · 0 comments ## Summary A detailed engineering walkthrough of migrating a 6-year-old Flutter e-commerce app (Flushion) to modern standards. Covers upgrading from Dart 2.7 to Dart 3/Flutter 3.44 with null safety, replacing legacy FlutterFire packages and rewriting all changed API call sites, migrating Android build tooling from AGP 3.5/Gradle 5.6 to AGP 8.1/Gradle 8.3, and standing up a new Firebase project after the original was reclaimed. Beyond compilation, the post documents runtime bugs only found by manual click-through: a broken Google Sign-In on web due to deprecated OAuth popup flow, a hardcoded admin email gate blocking all access, a cart duplication bug, a checkout success toast firing on empty carts, a signup form silently discarding the display name, and a debug print leaking credentials. Also covers Flutter web automation challenges with CanvasKit's canvas-only rendering and DWDS dev server limitations. New features added include a persisted account page, real order history, and cart quantity controls. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Medium](https://daily.dev/posts/medium-bgqngssje) · Medium · 0 upvotes · 0 comments - [Using Flutter with Firebase: A Developer's Guide](https://daily.dev/posts/using-flutter-with-firebase-a-developer-s-guide-jbpavk3vl) · Flutter Community · 0 upvotes · 0 comments - [May 2026: Google I/O, Flutter 3.44, Dart 3.12, Building Pi in a World of Slop](https://daily.dev/posts/may-2026-google-i-o-flutter-3-44-dart-3-12-building-pi-in-a-world-of-slop-6orgsqczr) · Code with Andrea · 0 upvotes · 0 comments --- Tags: [#flutter](https://daily.dev/tags/flutter), [#firebase](https://daily.dev/tags/firebase), [#dart](https://daily.dev/tags/dart) [View this post on daily.dev](https://daily.dev/posts/reviving-a-6-year-old-flutter-app-the-technical-play-by-play-tbspmmxcq) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Reviving a 6-year-old Flutter app: the technical play-by-play","url":"https://daily.dev/posts/reviving-a-6-year-old-flutter-app-the-technical-play-by-play-tbspmmxcq","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/reviving-a-6-year-old-flutter-app-the-technical-play-by-play-tbspmmxcq"},"datePublished":"2026-07-12T11:50:28.927Z","dateModified":"2026-07-12T11:51:01.627Z","description":"A detailed engineering walkthrough of migrating a 6-year-old Flutter e-commerce app (Flushion) to modern standards. 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