import { QueryList, AfterContentInit, ChangeDetectorRef, AfterContentChecked, AfterViewInit } from '@angular/core';
import { GhFormFieldControl } from './form-field-control';
/** Hint text to be shown underneath the form field control. */
export declare class GhHint {
    /** Whether to align the hint label at the start or end of the line. */
    align: 'start' | 'end';
    /** Unique ID for the hint. Used for the aria-describedby on the form field control. */
    id: string;
}
export declare class GhLabel {
}
/** Single error message to be shown underneath the form field. */
export declare class GhError {
    id: string;
}
export declare class GhFormField implements AfterContentInit, AfterContentChecked, AfterViewInit {
    private _changeDetectorRef;
    /** Text for the form field hint. */
    hintLabel: string;
    _hintLabelId: string;
    /** State of the gh-error animations. */
    _errorAnimationState: '' | 'enter' | 'enter-delayed';
    _labelChild: GhLabel;
    _hintChildren: QueryList<GhHint>;
    _errorChildren: QueryList<GhError>;
    _control: GhFormFieldControl<any>;
    private _hintLabel;
    private _displayedError;
    constructor(_changeDetectorRef: ChangeDetectorRef);
    ngAfterContentInit(): void;
    ngAfterContentChecked(): void;
    ngAfterViewInit(): void;
    /** Determines whether a class from the NgControl should be forwarded to the host element. */
    _shouldForward(prop: string): boolean;
    /** Determines whether to display errors or not. */
    _getDisplayedError(): boolean;
    /** Throws an error if the form field's control is missing. */
    private _validateControlChild();
    /** Does any extra processing that is required when handling the hints. */
    private _processHints();
    /**
     * Ensure that there is a maximum of one of each `<gh-hint>` alignment specified, with the
     * attribute being considered as `align="start"`.
     */
    private _validateHints();
    /**
     * Sets the list of element IDs that describe the child control. This allows the control to update
     * its `aria-describedby` attribute accordingly.
     */
    private _syncDescribedByIds();
    private _updateAnimationState();
}