import { AssistantTr } from './i18n';
/**
 * Is this EXACTLY loading copy an older build stored — and nothing else?
 *
 * ★ Exact whole-string match, trimmed. "I am thinking..." and "Thinking about
 * your irrigation schedule" are answers. Empty is NOT filler here: an empty
 * bubble is a question for the display projection, which knows whether a turn
 * is live.
 *
 * ★★ Compared against the CURRENT translation and the English fallback. That
 * covers copy written in English and read in any locale (the fallback), and
 * copy written and read in the same locale, including a key that is published
 * but not ACTIVE and so resolved to its fallback — which is how ~9,000
 * assistant keys behaved in prod. It does NOT cover copy written translated and
 * read after switching to another locale, English included: that stored text
 * matches neither. The write-time locale is not recorded, so this is a false
 * negative — the filler is shown as it was stored — which is the direction this
 * is meant to err in. Reach is small: loading copy was only translated from
 * 2026-09-10.
 */
export declare function isLegacyFiller(tr: AssistantTr, content: string | null | undefined): boolean;
/**
 * Is this EXACTLY the "Stopped" a BOFF-7229 build wrote into content?
 *
 * ★ Those builds (2026-09-10 to BOFF-7277) replaced the filler of a turn the
 * user cut off with the word itself. The display projection shows a turn that
 * ended with nothing as a muted "Stopped" with no Copy or Listen; recognising
 * the stored word lets those older turns look — and behave — the same.
 *
 * Deliberately a separate predicate from `isLegacyFiller`: "Stopped" is a
 * settled outcome, not loading copy, and the projection only treats it as one
 * when the message carries no completion evidence. A reply that says "Stopped
 * the pump at 4pm." never matches, and a completed reply that is exactly
 * "Stopped" carries evidence.
 */
export declare function isLegacyStopped(tr: AssistantTr, content: string | null | undefined): boolean;
/**
 * The older predicate: empty OR exactly legacy filler.
 *
 * @deprecated Kept for the public API only. It answered "is this bubble still
 * loading?" by reading content, which is the question BOFF-7277 moved to live
 * processing state. Use `getAssistantDisplayContent` to decide what to show.
 */
export declare function isStageCopy(tr: AssistantTr, content: string | null | undefined): boolean;
/**
 * Strip the "Thinking..." an older build left IN FRONT OF its own timeout note.
 *
 * ★★ The shape, exactly: the progress sentinel, a blank line, then one of the
 * incomplete-turn notices (translated or English) and whatever followed it. A
 * turn whose stream budget elapsed before any output passed the sentinel into
 * `withIncompleteTurnNotice`, which keeps any non-blank body — so the stored
 * reply read "Thinking...\n\n_This turn stopped before an answer arrived..._".
 * That is a genuine settled outcome with our filler glued to it; the note is
 * kept and the filler is not.
 *
 * Returns the text without the prefix, or `null` when the content is anything
 * other than that shape — a model reply is never touched.
 */
export declare function stripLegacyFillerPrefix(tr: AssistantTr, content: string): string | null;
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