export interface ResolveBaseOpts {
    readonly explicitFlag?: string;
    readonly env: NodeJS.ProcessEnv;
    readonly cwd: string;
}
export interface ResolvedBase {
    readonly ref: string;
    readonly source: "flag" | "github" | "buildkite" | "gitlab" | "merge-base" | "head~1";
}
export declare function resolveBaseRef(opts: ResolveBaseOpts): ResolvedBase;
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