import type { Annotation, SourceDef } from '../../../model/malloy_types';
import type { HasParameter } from '../parameters/has-parameter';
import { Source } from './source';
import type { ParameterSpace } from '../field-space/parameter-space';
/**
 * A Source that is a virtual union of the fields of other sources, choosing
 * the first source that has all the fields at query time.
 */
export declare class CompositeSource extends Source {
    readonly sources: Source[];
    elementType: string;
    currentAnnotation?: Annotation;
    constructor(sources: Source[]);
    getSourceDef(parameterSpace: ParameterSpace | undefined): SourceDef;
    withParameters(parameterSpace: ParameterSpace | undefined, pList: HasParameter[] | undefined): SourceDef;
}