export interface Provider {
    /** Resolve a `group/source` reference to its text, or undefined if absent. */
    resolve(ref: string): string | undefined;
}
/** Deterministic, in-memory provider (the conformance + test provider). */
export declare class InMemoryProvider implements Provider {
    private readonly map;
    constructor(map: Record<string, string>);
    resolve(ref: string): string | undefined;
}
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