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Recorded on 26 October 2026, unchanged since

Entry #116 of UpFork’s ledger · A lesson's version: An input's FileList is live: copy it before clearing the input, or a deferred state update reads an empty list Open it

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Recorded: 26 Oct 2026, 09:46 UTC
Signed with: k1 · Ed25519
Entry hash: 68653988215f1470211c5c3614498b5633604df1623234dbe5e798fa1d5047b5
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Signature: pW6nZAn4XFlAcnxXdBSLgsA8iwh/lwlbCeoEqpH3XJvsv17zQk74Y32YSAxiJX5028dmNrN3X7OwF3bGCH9GCw==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "an-email-client-on-shadcn-ui-lazy-tiptap-autosave-and-six-traps-in-radix-rea",
  "articleRevision": 1,
  "assumed": "`setFiles((current) => [...current, ...input.files])` followed by `input.value = \"\"` would add the picked files.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 2e3b352; compose-window.tsx line 181, and the same in inline-reply.tsx.",
  "fix": "copy first, `const picked = [...list]`, and build the attachments from the copy.",
  "happened": "`input.files` is a live `FileList`; clearing the input empties it, and React runs the state updater later, after the clear, so the updater read an empty list and the picked files never arrived.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-326H",
  "packages": "",
  "product": "email-client-inbox-react-shadcn",
  "productRevision": 1,
  "publishedAt": "2026-10-26T09:45:15.884Z",
  "site": "https://upfork.dev",
  "title": "An input's FileList is live: copy it before clearing the input, or a deferred state update reads an empty list",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-326H",
  "version": 1,
  "why": ""
}