import { FC } from 'react';
interface Props {
    onFiles: (files: FileList | null) => void;
    /**
     * The OS picker is about to take over the screen.
     *
     * ★ Exists for the voice session, which must release the microphone before the
     * camera app claims it. Fired on the `.click()` rather than on selection,
     * because by the time a file arrives the damage is done — and a CANCELLED
     * picker never reports anything at all.
     */
    onPickerOpen?: () => void;
    /**
     * Which way the source menu opens.
     *
     * ★ 'up' is right for the COMPOSER, which sits at the bottom of the panel — a
     * downward menu there is clipped by the panel edge at every size. It is wrong
     * for the voice session, whose attach control is anchored at the TOP: the menu
     * would open above the button, outside the panel, and all four sources would be
     * unreachable. The control would look present and do nothing.
     */
    direction?: "up" | "down";
    /** False once MAX_ATTACHMENTS is reached — the control explains why. */
    canAddMore: boolean;
    disabled?: boolean;
}
/**
 * Leading circular "+" attach control in the composer.
 *
 * ★ Opens a SOURCE MENU rather than the OS picker directly. One picker had to
 * stand in for every source, and on a phone it lands in Files — so
 * photographing a diseased leaf, the single most likely thing a farmer wants to
 * show the assistant, meant leaving for the camera app and coming back.
 *
 * ★ One input, reconfigured per source, rather than one input each. `accept` and
 * `capture` are set immediately before `.click()`, so there is exactly one place
 * a change event can arrive from and the existing `onFiles` contract — shared
 * with drag-drop and paste — is untouched.
 *
 * ★ Camera uses the `capture` attribute rather than a bespoke `getUserMedia`
 * viewfinder. That hands capture → preview → retake → use to the OS camera,
 * which does it better, is already localised, and cannot be exercised on a
 * desktop CI box at all; on a device without a camera the attribute is ignored
 * and the picker opens as usual, so it degrades instead of breaking.
 *
 * `accept` is advisory — the picker still allows "All files" on most platforms —
 * so validation lives in `validateFile`, not here.
 */
export declare const AssistantAttachmentButton: FC<Props>;
export {};
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