import { ChangeEvent, Ref } from 'react';
import { ChatInputV2AttachedFile } from './ChatInputV2.types';
export declare const FILE_NAME_TAG_MAX_LEN = 8;
export declare const truncateFileNameForTag: (name: string) => string;
/** Layout buffer and “+ N more” reserve — mirrors `AttachmentFile` in ChatInput. */
export declare const ATTACHMENT_ROW_BUFFER_PX = 30;
export declare const ATTACHMENT_ROW_MORE_BUTTON_RESERVE_PX = 100;
export declare const ATTACHMENT_ROW_GAP_PX = 8;
export declare const OVERFLOW_MENU_TRIGGER_CLASS = "overflow-menu-trigger";
/** Outer container resize: ignore tiny fluctuations; treat meaningful width change as ≥10px. */
export declare function isSignificantOuterWidthChange(previousWidth: number, nextWidth: number): boolean;
/** Wider viewport → allow re-measuring with more chips visible (see `isExpanding` in row). */
export declare function isOuterWidthExpanding(previousWidth: number, nextWidth: number): boolean;
/**
 * After `attachedFiles.length` changes, update visible cutoff without flashing all chips on remove
 * or jumping to full list on add.
 */
export declare function reduceCutoffForFileCountChange(previousFileCount: number, nextFileCount: number): (currentCutoff: number) => number;
/** When true with fewer rendered chips than files, the row first sets the cutoff to all files, then re-runs (viewport widening or file list shrink). */
export declare function shouldExpandCutoffToMeasureAllChips(isExpanding: boolean, renderedChipCount: number, attachedFileCount: number): boolean;
type ComputeCutoffArgs = {
    filesContainer: HTMLElement;
    attachedFileCount: number;
    /** Inter-chip gap in px — must match `gap` on the flex row (from tokens, e.g. `attachedFilesContainer.gap`). */
    rowGapPx: number;
};
/**
 * Walk visible chip DOM nodes and compute how many files can stay inline before “+ N more”.
 */
export declare function computeAttachmentRowCutoff({ filesContainer, attachedFileCount, rowGapPx, }: ComputeCutoffArgs): number;
export declare function sliceVisibleChatInputV2AttachedFiles(attachedFiles: ChatInputV2AttachedFile[], cutOffIndex: number): ChatInputV2AttachedFile[];
export declare function sliceOverflowChatInputV2AttachedFiles(attachedFiles: ChatInputV2AttachedFile[], cutOffIndex: number): ChatInputV2AttachedFile[];
/** Max height in px: explicit prop wins; otherwise parse token `maxHeight` (defaults to 200). */
export declare function resolveChatInputV2TextareaMaxHeightPx(textareaMaxHeightProp: number | undefined, tokenMaxHeight: unknown): number;
/** ChatGPT-style auto-grow: clamp scroll height to `maxHeightPx`. */
export declare function applyChatInputV2TextareaAutoHeight(el: HTMLTextAreaElement | null, maxHeightPx: number): void;
export declare function notifyChatInputV2DuplicateFiles(duplicateFileNames: string[]): void;
/** Hidden file input: filters duplicates vs `attachedFiles`, shows SnackbarV2, forwards new files. Resets input value. */
export declare function handleChatInputV2FileInputChange(e: ChangeEvent<HTMLInputElement>, attachedFiles: ChatInputV2AttachedFile[], onAttachFiles: (files: File[]) => void): void;
export declare function assignForwardedRef<T>(node: T | null, ref: Ref<T | null> | null | undefined): void;
export declare const truncatePlaceholder: (textarea: HTMLTextAreaElement | null, placeholder: string | undefined) => string | undefined;
export declare const removePxFromValue: (value: number | string) => number;
export {};