25 lines
787 B
TypeScript
25 lines
787 B
TypeScript
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export type GhostSuggestionDecision =
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| { type: "keep" }
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| { type: "show"; suggestion: string }
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| { type: "hide" };
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/**
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* Prefer a stable ghost suggestion while the user's typed input still
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* falls within the currently shown prediction. This avoids a "jitter"
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* effect where freshly fetched suggestions keep replacing the same
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* visual prediction one character at a time.
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*/
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export function decideGhostSuggestion(
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activeSuggestion: string | null,
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input: string,
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nextSuggestion: string | null,
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): GhostSuggestionDecision {
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if (activeSuggestion && activeSuggestion.startsWith(input)) {
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return { type: "keep" };
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}
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if (nextSuggestion && nextSuggestion.startsWith(input)) {
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return { type: "show", suggestion: nextSuggestion };
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}
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return { type: "hide" };
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}
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