import { Reporter } from 'gatsby';
export declare type ImgixSourceDataResolver<TSource, TData> = (obj: TSource) => TData | null | undefined | Promise<TData | null | undefined>;
export declare const noop: () => void;
export declare function invariant(condition: unknown, msg: string, reporter: Reporter): asserts condition;
export declare const findPossibleURLsInNode: (node: object, depth?: number) => {
    path: string;
    value: string;
}[];
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