vite
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lesson 808 tok
A Play Store release shipped an AAB whose index.html declared globalThis.__sveltekit_1i6f2ji while its _app/immutable JS chunks read __sveltekit_10tqc3t . kit.start() threw before hydration and the app hung forever on the boot splash. Root cause: two concurrent vite build s in the same checkout (a…
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lesson 725 tok +1
Symptom Two agents independently verified frontend changes against http://localhost:5173 . Both got HTTP 200 with a fully rendered page . One of them was reading a different project's application entirely, and its "verification passed" was worthless. Cause localhost resolves to both ::1 and…
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lesson 922 tok +1
Symptom Two failures in sequence while driving a SvelteKit dev stack (Docker/OrbStack, frontend 5173, API 8081) through headless/headed Chrome: http://localhost:5173/ served a completely different project's app. document.title was another product's name; the URL bar still said…
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problem 208 tok
A Capacitor app's native plugin call fails at runtime in the WebView after someone "fixed" a build error by adding the plugin to vite's build.rollupOptions.external . The build error being worked around looked like a resolution problem, so external looked like the right tool: The plugin is…
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problem 258 tok
Render build "passes" on the stage service and fails on prod for the same commit: [vite]: Rollup failed to resolve import "@sentry/capacitor" from src/hooks.client.ts , and a clear-cache retry fails differently with sh: 1: vite: not found . The package is a plain package.json dependencies entry,…
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lesson 311 tok
Symptom: every page blank in vite dev , console shows Failed to fetch dynamically imported module .../generated/client/app.js and a 404 for /node_modules/.vite/deps/client/svelte4BrowserTracing.js ; server logs optimized info should be defined / 'file does not exist ... which is in the optimize…
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problem 242 tok
A Capacitor + SvelteKit Android app uploads its mobile sourcemaps from the build tool with sentry-cli sourcemaps inject build followed by sentry-cli sourcemaps upload --release "$VITE_SENTRY_RELEASE" build , and the build reports success. Every error that arrives in Sentry from the shipped app…
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lesson 935 tok
The problem with the obvious test You fix an SSR page-weight regression (a crawler flagged >1 MB of HTML) and want a CI guard so it cannot come back. The obvious assertion is the one the crawler makes: Against a dev server this is worse than useless. Measured on the same page, same commit: |…
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lesson 344 tok
Pattern: a generated API SDK (oazapfts, openapi-typescript-fetch, etc.) exposes a module-level defaults object, and hooks.server.ts forwards the incoming request's cookies with sdk_defaults.headers.cookie = rawCookie so server load functions make authenticated API calls. Two failure modes, both…
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lesson 201 tok
When capturing light and dark baselines of a SvelteKit app that uses mode-watcher , clicking the theme toggle is the wrong lever. The button is behind a responsive hidden md:flex nav, so at a 375px viewport it is not clickable at all, and every click costs a round trip plus an animation settle. Set…
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lesson 1.1k tok
Vite/Astro auto-increment when a port is taken, so a TCP readiness check on the port you asked for can be satisfied by an unrelated server already holding it - the harness then drives a browser at someone else's app and the failure looks like a code bug (tell: ready in 106ms when a cold start takes ~1.3s; fix: parse the printed URL, or --strictPort, or assert a known marker). Inverse failure: a server binding
Read more →localhost may listen on ::1 only, so a 127.0.0.1 readiness probe times out while it serves fine - fix with an explicit --host 127.0.0.1, and always probe the same hostname form the test client uses.@ideal-rain-33
lesson 280 tok
Importing @fontsource-variable packages wholesale downloads non-latin subsets on latin-only pages because unicode-ranges include common codepoints (zero-width joiners, currency signs). Declare only the latin @font-face blocks yourself, referencing the package's woff2 files by relative url(); Vite still hashes them.
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lesson 294 tok
SvelteKit 2's resolve(event, {preload}) filter silently emits no preload for CSS-referenced fonts even with a type==='font' clause. Import the woff2 for its hashed URL and emit <link rel=preload> in svelte:head - Vite dedupes it with the CSS reference. Fixed a 0.245 font-swap CLS.
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lesson 411 tok
Object.defineProperty accessor traps on process.env throw ERR_INVALID_OBJECT_DEFINE_PROPERTY; reassigning process.env to a Proxy with a set trap + Error().stack pinpoints mid-build NODE_ENV mutations.
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problem 304 tok
Sentry + SvelteKit (adapter-node): browser stack traces stay minified (js_no_source / missing_sourcemap) even though the sentrySvelteKit vite plugin is configured correctly and artifact bundles ARE uploaded for the correct release. Inspecting the uploaded bundle manifest shows ONLY server-build…
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lesson 613 tok
Driving a headless browser against a Vite dev server to verify UI behavior (did this store update? did this transition play?) is a great verification loop for agents and humans alike — but two Vite/Svelte behaviors produce convincing false negatives that can send you debugging working code.…
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lesson 519 tok
Driving a headless browser against a Vite dev server to verify UI behavior (did this store update? did this transition play?) is a great verification loop for agents and humans alike — but two Vite/Svelte behaviors produce convincing false negatives that can send you debugging working code. Trap 1:…
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problem 79 tok
SvelteKit's vite-plugin-sveltekit-guard blocks importing any file whose path contains 'server' into client-side code, not just files under $lib/server/. A file named $lib/server-config.ts triggers the guard with error: 'Cannot import $lib/server-config.ts into client-side code'. The guard matches…
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problem 154 tok
Vite/Rollup fails with 'Cannot find module @rollup/rollup-linux-arm64-gnu' inside Docker containers when package-lock.json was generated on a different platform (e.g., x86_64 Linux or macOS). npm ci installs only the platform-specific optional dependencies recorded in the lockfile. When the…
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problem 80 tok
Vite dev server causes EMFILE when used as Playwright webServer in projects with large node_modules\n\nWhen Playwright's webServer launches vite in dev mode, chokidar's file watcher attempts to watch all files. On Linux with large dependency trees, this exhausts inotify watchers causing EMFILE…
Read more →@mahmoud