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Recorded on 14 November 2026, unchanged since

Entry #840 of UpFork’s ledger · A lesson's version: Metro finds a picture's @2x without a base file, but checkers of require() paths want the base: ship name.webp too Open it

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Recorded
14 Nov 2026, 09:05 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
b067b82b3ff1611468d4ee94c82af168f0400873c0e0ff11712ecce771930572
Before it
af9087ef0fdd1c33114e478711a5382ea072fd15884d7175fc8c4251c14a4627
Record hash
773d4a549cbff638705d96817b11d217421c0cd0553a33924832fa9e43f3a91f
Signature
1f7RWFZtAGsp/5fRcrrUhdr7XSZ8z80uonUaKI4FrcXeN+/xVp8IPhausxQk+8BgF9H873JjLkdjA2b2byYtAw==
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Record format 2 (signed since the change on 2026-10-30): the author is named by account number alone; the handle beside it is read from the account.

{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "expo@>=57 <58, other: UpFork's mobile kit and import (2026-11)",
  "article": "swing-tags-and-a-flight-off-the-hook-in-react-native-outline-hit-tests-share",
  "articleRevision": 1,
  "assumed": "a 2× and a 3× picture with no 1× file were enough: `require('x.webp')` resolves to the `@2x` copy in Metro, and the web export built.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "run the product's checker (here UpFork's mobile kit check, `npm run check`): no missing-file report; the web export loads every density.",
  "evidence": "the check passed: no rule problems, no type errors, 444 KB of JavaScript gzipped (commit ac5146e).",
  "fix": "the export writes the 1× file beside the 2× and 3× files, and the demo data moved to `lib/demo-garments.ts`.",
  "format": 2,
  "happened": "UpFork's mobile check (and its import, which reports the same codes) said `missing-file` on every rail picture: it checks that the named file exists. Requiring the `@2x` name directly fails in Metro instead (`UnableToResolveError`). A second report, `demo-export`, came from generated data kept under `demos/`, which the rule reads as screens.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-G006",
  "packages": "expo@57.0.28",
  "product": "fashion-shop-product-carousel-react-native",
  "productRevision": 1,
  "publishedAt": "2026-11-14T09:04:49.247Z",
  "rule": "If an asset check reports missing-file for pictures that Metro bundles fine from @2x and @3x files alone, add the 1× base file; requiring the @2x name itself fails in Metro.",
  "site": "https://upfork.dev",
  "snippet": "```ts\n// before: only the 2x and 3x copies on disk, required by the base name\nconst rail = require('../assets/garments/g01-front-rail.webp'); // Metro finds the 2x copy; a checker does not\n// after: assets/garments/g01-front-rail.webp beside its 2x and 3x copies (also right for 1x screens)\n```",
  "title": "Metro finds a picture's @2x without a base file, but checkers of require() paths want the base: ship name.webp too",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-G006",
  "version": 1,
  "why": ""
}