/**
 * Data slot names that hosts treat specially for every widget type (a system panel, and the panel
 * that switches on member colors). A plugin's data slot must not use them (exact, case-sensitive
 * match).
 *
 * @internal
 */
export declare const RESERVED_DATA_SLOT_NAMES: readonly string[];
/**
 * A data slot as read from a plugin manifest, which may come from untyped code: every field is
 * unknown until checked.
 *
 * @internal
 */
export type UncheckedDataSlot = {
    readonly name?: unknown;
    readonly displayName?: unknown;
    readonly maxItems?: unknown;
    readonly visibleWhen?: unknown;
};
/**
 * A problem found in one data slot of a plugin.
 *
 * @internal
 */
export type DataSlotProblem = {
    /** The data slot's `name` as declared (may be missing or not a string). */
    readonly slotName: unknown;
    /** What is wrong, phrased to follow `data slot "<name>"`. */
    readonly message: string;
};
/** Checks one data slot against the whole slot list; returns a message or `undefined`. */
type DataSlotCheck = (slot: UncheckedDataSlot, slots?: readonly UncheckedDataSlot[]) => string | undefined;
/**
 * Flags a `maxItems` that is present but not a whole number of at least 1.
 *
 * @param slot - The data slot to check.
 * @returns The problem message, or `undefined` when the slot follows the rule.
 * @internal
 */
export declare const checkMaxItems: DataSlotCheck;
/**
 * Flags a name that is not camelCase; saved widgets load the slot's items under the camelCase form.
 *
 * @param slot - The data slot to check.
 * @returns The problem message, or `undefined` when the slot follows the rule.
 * @internal
 */
export declare const checkCamelCaseName: DataSlotCheck;
/**
 * Flags a name reserved by hosts (see `RESERVED_DATA_SLOT_NAMES`).
 *
 * @param slot - The data slot to check.
 * @returns The problem message, or `undefined` when the slot follows the rule.
 * @internal
 */
export declare const checkReservedName: DataSlotCheck;
/**
 * Flags a display name equal to the name of another slot.
 *
 * @param slot - The data slot to check.
 * @param slots - Every data slot of the list, including `slot`.
 * @returns The problem message, or `undefined` when the slot follows the rule.
 * @internal
 */
export declare const checkDisplayName: DataSlotCheck;
/**
 * Flags a `visibleWhen` the SDK cannot read; such a slot is always shown.
 *
 * @param slot - The data slot to check.
 * @returns The problem message, or `undefined` when the slot follows the rule.
 * @internal
 */
export declare const checkVisibleWhen: DataSlotCheck;
/**
 * Finds the problems in a plugin's data slot list, one per broken rule per slot, in slot order.
 * Anything that is not a list of objects is ignored rather than rejected.
 *
 * @param inputs - The `dataPanel.config.inputs` of a plugin manifest, unchecked.
 * @returns The problems found; empty when the list follows every rule.
 * @internal
 */
export declare const findDataSlotProblems: (inputs: unknown) => readonly DataSlotProblem[];
export {};