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A corrected token // slides out sideways as its replacement slides in, the freed width // collapsing under it so the line reflows like a compositor swapping a // sort — not a flash. Pure DOM/CSS transforms, no canvas. // // The motion IS the data: jitter vs. baseline is the only signal for // provisional vs. committed, there's no separate status pill. Distinct from // streaming-ink-dry (which encodes elapsed-time freshness via weight/opacity and never // snaps) and text-decrypt (a one-shot scramble-to-reveal on a fixed string, // no underlying state machine at all). // --------------------------------------------------------------------------- type Key = string | number; export interface LooseTypeToken { /** * Stable identity. Reusing an id updates that token in place (e.g. a * still-provisional token settling toward its final wording without a * full swap). Give a *replacement* token a fresh id at the same array * position to represent a correction — the old id's span slides out as * the new id's span slides in, at that seam. */ id: Key; text: string; /** Locked into the chase. Default false (provisional). */ committed?: boolean; } export interface LooseTypeProps { /** Full ordered snapshot of the line's tokens, every render. */ tokens: LooseTypeToken[]; /** extra classes merged onto the rendered root element */ className?: string; } type Status = "entering" | "settled" | "removing"; interface Item { id: Key; text: string; committed: boolean; jitter: { ty: number; rot: number }; status: Status; /** entering: false until the slide-in transition should start */ animateIn?: boolean; /** removing: measured px width, captured before the collapse starts */ widthPx?: number; /** removing: false until the collapse/slide-out transition should start */ collapse?: boolean; } const ENTER_MS = 260; const EXIT_MS = 260; const COMMIT_MS = 420; // A back-out curve is the pure-CSS stand-in for a stiff, low-damping spring: // it overshoots past the resting value before settling, same read as a sort // dropping into the chase and bouncing once against its neighbors. const SPRING_EASE = "cubic-bezier(0.34, 1.56, 0.64, 1)"; // Deterministic per-token offset so a token's tilt/lift never rerolls across // re-renders — "seeded per token", not per paint. Two independent floats are // pulled from one FNV-1a hash by mixing it a second time for the pair. function seededJitter(id: Key): { ty: number; rot: number } { const s = String(id); let h = 0x811c9dc5; for (let i = 0; i < s.length; i++) { h ^= s.charCodeAt(i); h = Math.imul(h, 0x01000193); } const h2 = Math.imul(h ^ 0x9e3779b9, 0x2545f491); const ty = (((h >>> 0) % 2001) / 1000 - 1) * 1; // -1..1 px const rot = (((h2 >>> 0) % 1201) / 1000 - 0.6) * 1; // -0.6..0.6 deg return { ty, rot }; } function makeEntering(t: LooseTypeToken): Item { return { id: t.id, text: t.text, committed: !!t.committed, jitter: seededJitter(t.id), status: "entering", animateIn: false, }; } function makeSettled(t: LooseTypeToken): Item { return { id: t.id, text: t.text, committed: !!t.committed, jitter: seededJitter(t.id), status: "settled", }; } function carryOver(prev: Item, t: LooseTypeToken): Item { return { ...prev, text: t.text, committed: !!t.committed }; } // Walks the previous render list against the new snapshot in order. A // surviving id is carried over in place; an id that vanished becomes (or // stays) a "removing" ghost planted exactly where it was; a brand-new id // is inserted as "entering" right before whatever surviving token it now // precedes. For the common case — append-only growth, or a single tail // token swapped for its correction — this lands the ghost and its // replacement adjacent, at the seam, which is the whole point. function diff(prev: Item[], tokens: LooseTypeToken[]): Item[] { const incoming = new Set(tokens.map((t) => t.id)); const next: Item[] = []; let ti = 0; for (const p of prev) { if (incoming.has(p.id)) { while (ti < tokens.length && tokens[ti]!.id !== p.id) { next.push(makeEntering(tokens[ti]!)); ti++; } if (ti < tokens.length && tokens[ti]!.id === p.id) { next.push(carryOver(p, tokens[ti]!)); ti++; } } else if (p.status === "removing") { next.push(p); // already ghosted, don't restart its timer/measurement } else { next.push({ ...p, status: "removing", widthPx: undefined, collapse: false }); } } while (ti < tokens.length) { next.push(makeEntering(tokens[ti]!)); ti++; } return next; } export function LooseType({ tokens, className = "" }: LooseTypeProps) { const [items, setItemsState] = useState(() => tokens.map(makeSettled)); const itemsRef = useRef(items); // synchronous init so a mount with provisional tokens already present under // prefers-reduced-motion never paints the jittered branch on the first frame const reducedRef = useRef( typeof window !== "undefined" && typeof window.matchMedia === "function" && window.matchMedia("(prefers-reduced-motion: reduce)").matches ); const nodesRef = useRef(new Map()); const measuredRef = useRef(new Set()); const flippedRef = useRef(new Set()); const setItems = useCallback((next: Item[]) => { itemsRef.current = next; setItemsState(next); }, []); useEffect(() => { reducedRef.current = window.matchMedia("(prefers-reduced-motion: reduce)").matches; }, []); const sig = useMemo( () => tokens.map((t) => `${t.id}:${t.committed ? 1 : 0}:${t.text}`).join(""), [tokens] ); useEffect(() => { if (reducedRef.current) { setItems(tokens.map(makeSettled)); return; } setItems(diff(itemsRef.current, tokens)); // eslint-disable-next-line react-hooks/exhaustive-deps }, [sig]); // Entering tokens: flip from the pre-slide style to the animated one a // frame after mount, so the browser actually observes a style change to // transition from (setting the "final" style on the same paint as mount // would just render there, no motion). useLayoutEffect(() => { if (reducedRef.current) return; const pending = items.filter((it) => it.status === "entering" && !it.animateIn && !flippedRef.current.has(it.id)); if (!pending.length) return; for (const it of pending) flippedRef.current.add(it.id); const raf = requestAnimationFrame(() => { setItems( itemsRef.current.map((it) => it.status === "entering" && pending.some((p) => p.id === it.id) ? { ...it, animateIn: true } : it ) ); }); // If this rAF gets cancelled (e.g. the sibling "removing" measurement // effect fires a synchronous setItems in the same layout-effect flush, // before the browser ever paints a frame), the flip never actually // happened — un-mark these ids so the next effect pass retries them. // Without this, a token that entered in the same tick a correction was // ghosted (exactly the provisional-correction seam) got permanently // stuck at opacity:0/transition:none: never animated in, never fired // the transitionend that settles it — invisible forever. return () => { cancelAnimationFrame(raf); for (const it of pending) flippedRef.current.delete(it.id); }; }, [items, setItems]); // Removing tokens: measure the natural width first (so the collapse has a // real px start point — "auto" can't be transitioned), then flip to the // collapsed target a frame later. useLayoutEffect(() => { if (reducedRef.current) return; const toMeasure = items.filter((it) => it.status === "removing" && it.widthPx === undefined && !measuredRef.current.has(it.id)); if (!toMeasure.length) return; for (const it of toMeasure) measuredRef.current.add(it.id); const widths = new Map(); for (const it of toMeasure) { const node = nodesRef.current.get(it.id); widths.set(it.id, node ? node.offsetWidth : 0); } setItems( itemsRef.current.map((it) => (widths.has(it.id) ? { ...it, widthPx: widths.get(it.id) } : it)) ); }, [items, setItems]); useEffect(() => { if (reducedRef.current) return; const toCollapse = items.filter((it) => it.status === "removing" && it.widthPx !== undefined && !it.collapse); if (!toCollapse.length) return; const raf = requestAnimationFrame(() => { setItems( itemsRef.current.map((it) => it.status === "removing" && toCollapse.some((p) => p.id === it.id) ? { ...it, collapse: true } : it ) ); }); return () => cancelAnimationFrame(raf); }, [items, setItems]); const onGhostTransitionEnd = useCallback( (id: Key, e: React.TransitionEvent) => { if (e.propertyName !== "max-width") return; measuredRef.current.delete(id); nodesRef.current.delete(id); setItems(itemsRef.current.filter((it) => it.id !== id)); }, [setItems] ); const onEnterTransitionEnd = useCallback( (id: Key, e: React.TransitionEvent) => { if (e.propertyName !== "opacity") return; flippedRef.current.delete(id); setItems(itemsRef.current.map((it) => (it.id === id && it.status === "entering" ? { ...it, status: "settled" } : it))); }, [setItems] ); const committedText = tokens .filter((t) => t.committed) .map((t) => t.text) .join(" "); return (

{committedText}

{items.map((it) => { const reduced = reducedRef.current; const base: React.CSSProperties = { display: "inline-block", marginRight: "0.28em", marginBottom: "0.15em", }; if (reduced) { return ( {it.text} ); } if (it.status === "entering") { const style: React.CSSProperties = it.animateIn ? { ...base, transform: `translateX(0) translateY(${it.jitter.ty}px) rotate(${it.jitter.rot}deg)`, opacity: 1, transitionProperty: "transform, opacity", transitionDuration: `${ENTER_MS}ms`, transitionTimingFunction: "cubic-bezier(0.16, 1, 0.3, 1)", } : { ...base, transform: "translateX(0.4em)", opacity: 0, transition: "none", }; return ( { if (node) nodesRef.current.set(it.id, node); }} className={it.committed ? "ns-streaming-token-settle-token text-foreground" : "ns-streaming-token-settle-token ns-streaming-token-settle-provisional text-ns-muted"} style={style} onTransitionEnd={(e) => onEnterTransitionEnd(it.id, e)} > {it.text} ); } if (it.status === "removing") { const style: React.CSSProperties = it.collapse ? { ...base, maxWidth: 0, marginRight: 0, opacity: 0, transform: "translateX(-0.4em)", overflow: "hidden", whiteSpace: "nowrap", transitionProperty: "max-width, margin-right, opacity, transform", transitionDuration: `${EXIT_MS}ms`, transitionTimingFunction: "ease-out", } : { ...base, maxWidth: it.widthPx !== undefined ? `${it.widthPx}px` : undefined, opacity: 1, transform: "translateX(0)", overflow: "hidden", whiteSpace: "nowrap", transition: "none", }; return ( { if (node) nodesRef.current.set(it.id, node); }} className={it.committed ? "ns-streaming-token-settle-token text-foreground" : "ns-streaming-token-settle-token ns-streaming-token-settle-provisional text-ns-muted"} style={style} onTransitionEnd={(e) => onGhostTransitionEnd(it.id, e)} > {it.text} ); } // settled: the resting spring lives here permanently, so a // provisional -> committed flip animates purely off the // `committed` boolean with no extra phase to schedule. return ( {it.text} ); })}

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