/**
 * UI strings the editor paints into the DOM (toolbar tooltips, the
 * fullscreen exit button) and onto the timeline canvas (phantom new-
 * track label, track header labels). Every user-visible literal in
 * `@aicut/core` flows through this interface — there are no hidden
 * hard-coded translations elsewhere in the library.
 *
 * Defaults to English. Hosts that want Chinese (or any other locale)
 * pass `locale: localeZh` to `Editor.create` / `Timeline.create`, or
 * override individual keys with `locale: { undo: "撤销" }`.
 */
interface Locale {
    undo: string;
    redo: string;
    split: string;
    trimLeft: string;
    trimRight: string;
    playPause: string;
    fullscreen: string;
    snap: string;
    /** Title shown on the snap button when snap is ON (clicking turns OFF). */
    snapOnTitle: string;
    /** Title shown when snap is OFF (clicking turns ON). */
    snapOffTitle: string;
    zoomOut: string;
    zoomIn: string;
    reset: string;
    /** Toolbar tooltip when no keyframe exists at the playhead. */
    keyframeAdd: string;
    /** Toolbar tooltip when one exists — clicking removes it. */
    keyframeRemove: string;
    /** Toolbar tooltip — jump the playhead to the selected clip's start. */
    seekClipStart: string;
    /** Toolbar tooltip — jump the playhead to the selected clip's end. */
    seekClipEnd: string;
    /** Toolbar tooltip — "+ PiP overlay" action button (host's file
     *  picker takes over on click). */
    pipAdd: string;
    /** Toolbar button tooltip — opens the aspect picker popover. */
    aspectTitle: string;
    /** Header inside the popover — sits above the ratio grid. */
    aspectMenuLabel: string;
    /** Label for the "follow source clip" item — clears `Project.aspect`. */
    aspectOriginal: string;
    /** Header text on the keyframe parameter panel. */
    keyframePanelTitle: string;
    /** Row label for the X-translation numeric input. */
    keyframePanelLabelX: string;
    /** Row label for the Y-translation numeric input. */
    keyframePanelLabelY: string;
    /** Row label for the scale numeric input. */
    keyframePanelLabelScale: string;
    /** Row label for the easing dropdown. */
    keyframePanelLabelEasing: string;
    /** Reset button label — pins this kf to identity (0, 0, 1). */
    keyframePanelReset: string;
    /** Reset button tooltip. */
    keyframePanelResetTitle: string;
    /** Badge tooltip — kf for THIS prop is pinned at this moment. */
    keyframePanelBadgePinned: string;
    /** Badge tooltip — prop has kfs elsewhere but not at this moment. */
    keyframePanelBadgeAnimated: string;
    /** Badge tooltip — prop has no kfs (riding the static base). */
    keyframePanelBadgeStatic: string;
    /** Time display suffix — appended after the seconds value. */
    keyframePanelTimeSuffix: string;
    keyframeEasingLinear: string;
    keyframeEasingEaseIn: string;
    keyframeEasingEaseOut: string;
    keyframeEasingEaseInOut: string;
    exitFullscreen: string;
    exitFullscreenTitle: string;
    /** Phantom row that appears under the last track during a drag. */
    newTrack: string;
    /** Track header — `{n}` is replaced with the 1-based track index. */
    videoTrackLabel: string;
    /** Same template format as videoTrackLabel. */
    audioTrackLabel: string;
}
/** English. The library default — chosen over Chinese as the OSS norm. */
declare const localeEn: Locale;
/** Simplified Chinese. */
declare const localeZh: Locale;
/** Spread defaults under host overrides — host can supply a partial. */
declare function mergeLocale(partial: Partial<Locale> | undefined): Locale;
/**
 * Replace `{key}` placeholders in a template. We only need `{n}`
 * substitution today; the implementation is generic so additional
 * keys (e.g. `{name}`) won't need a second pass.
 */
declare function formatLabel(template: string, vars: Record<string, string | number>): string;

export { type Locale as L, localeZh as a, formatLabel as f, localeEn as l, mergeLocale as m };