import { BaseAspect, FP } from "./Aspect";
/**
 * Do we consider that the particular fingerprint is relevant to this project,
 * based on an intermediate format?
 */
export declare type RelevanceTest<SOURCE> = (fingerprintName: string, source: SOURCE) => boolean;
/**
 * Aspect derived from some intermediate representation of a project such as a ProjectAnalysis.
 * As with DerivedAspect, the intermediate calculation must have been completed in a previous phase.
 */
export interface DerivedAspect<SOURCE, FPI extends FP = FP> extends BaseAspect<FPI> {
    /**
     * Function to extract fingerprint(s) from an intermediate representation
     * of this project. Implementation does not have access to the Project itself
     * and should be relatively inexpensive as it depends on previously extracted
     * data such as a ProjectAnalysis.
     */
    derive: (source: SOURCE) => Promise<FPI | FPI[]>;
    /**
     * Is this aspect relevant to this project? For example, if
     * we are tracking TypeScript version, is this even a Node project?
     * Is the target at all relevant
     */
    relevanceTest?: RelevanceTest<SOURCE>;
    /**
     * Is this aspect desired on this project, according to our standards?
     */
    necessityTest?: RelevanceTest<SOURCE>;
}
export declare function isDerivedAspect(aspect: BaseAspect): aspect is DerivedAspect<any>;