/**
 * Label derivation for `Chip purpose="picker"`.
 *
 * Kept out of the component so it can be tested in the node-only unit project,
 * and because the visible text and the accessible name have to be derived
 * together. They diverge on purpose -- the chip abbreviates to stay narrow in a
 * filter bar, while the accessible name spells the selection out -- and a
 * reader of one has to be able to see the other beside it, or they drift.
 */
/**
 * How the trigger summarises its selection.
 *
 * `value` names the first selection and counts the rest, which is what a user
 * wants for a short closed vocabulary: `Severity: Critical +1` still says which
 * severity. `count` names none of them, for values too long to sit in a chip --
 * a datastore index called `classifyout-saviynt_subscriber-saviynt-v4` would
 * push the chip past the width of the bar and tell the user nothing more than
 * `Datasources: 3` does.
 */
export type PickerSummary = 'value' | 'count';
export interface PickerLabel {
    /**
     * The field's name. Always present, and rendered in the muted ink: it is the
     * constant, so it should not compete with the part that changes.
     */
    field: string;
    /**
     * The selection as shown after the colon -- a value under `summary: 'value'`,
     * a number under `'count'`. Undefined when nothing is selected, which is what
     * suppresses the colon rather than leaving `Severity:` trailing into nothing.
     */
    detail?: string;
    /** What the counter shows, or 0 when no counter is needed. */
    overflow: number;
    /** The full selection, spoken. Always names what the visible text elides. */
    accessibleName: string;
}
/**
 * Derives the visible text, the counter and the accessible name for a picker
 * chip.
 *
 * @param field  The filter's name, e.g. `Severity`. Always visible, so an empty
 *               picker still says what it filters.
 * @param values The selection, already resolved to the labels a user reads --
 *               not raw option values. A chip showing `sev_1` has failed.
 */
export declare function pickerLabel(field: string, values: string[], summary?: PickerSummary): PickerLabel;