/**
 * Describes a Rule
 * @module @report-toolkit/inspector.rule
 *
 */
/**
 */
/**
 * A Rule which can be matched against a Context
 */
export class Rule {
    /**
     * Applies defaults to a rule definition during `Rule` construction.
     * @param {Partial<RuleDefinition>} ruleDef - Raw rule definition
     * @returns {RuleDefinition}
     */
    static applyDefaults(ruleDef: Partial<RuleDefinition>): RuleDefinition;
    /**
     * Operator.  Given a "handler" (returned by the rule definition's `inspect`
     * function), normalize it into an object (since it may be just a function)
     * @returns {import('rxjs').OperatorFunction<RuleHandler,RuleHandlerObject>}
     */
    static normalizeHandler(): import('rxjs').OperatorFunction<RuleHandler, RuleHandlerObject>;
    /**
     * Creates a `Rule` from a user-defined (or builtin) `RuleDefinition`, which
     * is the exports of a rule definition file.
     * @param {RuleDefinition} ruleDefinition - Rule definition
     * @returns {Rule} New rule
     */
    static create(ruleDefinition: RuleDefinition): Rule;
    /**
     * Applies defaults, assigns some metadata.
     * @param {RuleDefinition} ruleDef
     */
    constructor(ruleDef: RuleDefinition);
    /**
     * @type {string}
     */
    get id(): string;
    get description(): any;
    get url(): any;
    get schema(): any;
    /**
     * @type {object}
     * @todo update with schema for 'meta' prop
     */
    get meta(): any;
    /**
     * Lazily-created function which validates the schema itself when first
     * referenced, creates a config-validation function, caches it, then asserts
     * any user-supplied config is valid using said function.
     * @throws If user-supplied config is invalid.
     */
    get validate(): Function;
    /**
     * Calls the `inspect()` function of a Rule impl, which will return one or
     * more "handler" functions. Note `inspect()` might return a `Promise` which
     * resolves to the "handler" functions.
     * @param {Object} [config] Optional rule-specific config
     * @returns {Promise<Object|Function>}
     */
    handlers(config?: any): Promise<any | Function>;
    /**
     * Given a stream of Report objects and an optional configuration, execute the
     * `inspect()` function of the rule definition, which should return a "next"
     * handler function, or an object having handler function props `next` and
     * `complete`.
     * 1. Normalize the result of the `inspect()` so we can make assumptions about
     *    the shape of the returned value.
     * 2. For each `Report` (`report`), run the `next` handler as if it returned
     *    a `Promise`. This handler is passed the `report`, and any `Error`s
     *    thrown are trapped. The handler may return a string ("message"), a
     *    partial `Message` object, `Array` thereof, or a `Promise` resolving to
     *    any of that stuff, or just `undefined` in the case of "nothing to
     *    mention"
     * 3. Return values are correlated with the filepath of the report. Note that
     *    `Report` objects may not *have* a filepath if they were not loaded from
     *    file.
     * 4. Once all `Report`s have passed through the `next` handler, call the
     *    `complete` handler.  It receives no `report`, and can be used in tandem
     *    with `next` to perform aggregation. Supports the same return values as
     *    `next`
     * 5. Finally, filter out empty/falsy partial `Message`s (e.g., those without
     *    actual `string` `message` props), and normalize the `Message` by adding
     *    relevant metadata (`Rule` ID, user-supplied config used, default
     *    severity, etc.)
     * @param {{reports: import('rxjs').Observable<import('@report-toolkit/common/src/report').Report>, config?: object}} opts
     * @returns {import('rxjs').Observable<import('./message').Message>}
     */
    inspect({ reports, config }: {
        reports: import('rxjs').Observable<import('@report-toolkit/common/src/report').Report>;
        config?: object;
    }): import('rxjs').Observable<import('./message').Message>;
    /**
     * Given a {@link Config}, get associated rule config and create a `RuleConfig`.
     */
    toRuleConfig(config: any): import("./rule-config.js").RuleConfig;
}
/**
 * Creates a `Rule` from a user-defined (or builtin) `RuleDefinition`, which
 * is the exports of a rule definition file.
 * @param {RuleDefinition} ruleDefinition - Rule definition
 * @returns {Rule} New rule
 */
export function createRule(ruleDefinition: RuleDefinition): Rule;
export type RuleDefinition = {
    /**
     * - (schema for `meta` prop)
     */
    meta: object;
    /**
     * - Async function which receives `Context` object
     * and optional configuration
     */
    inspect: RuleDefinitionInspectFunction;
    /**
     * - Unique rule ID
     */
    id: string;
};
export type RuleDefinitionMeta = any;
export type RuleDefinitionId = string;
export type RuleDefinitionInspectFunction = (config?: object) => Promise<RuleHandler> | RuleHandler;
export type RuleHandler = ((report: import('@report-toolkit/common').Report) => Promise<import('./message').RawMessage> | import('./message').RawMessage | void | import('./message').RawMessage[]) | RuleHandlerObject;
export type RuleHandlerObject = {
    next: RuleHandlerFunction;
    complete: (() => Promise<import('./message').RawMessage> | import('./message').RawMessage | void) | null;
};
export type RuleHandlerFunction = (report: import('@report-toolkit/common').Report) => Promise<import('./message').RawMessage> | import('./message').RawMessage | void | import('./message').RawMessage[];