export interface FabricCommandLine {
    argv: readonly string[];
    cwd: string;
}
/**
 * The Fabric copy this process's command line loads with `-e`/`--extension`, when it is a
 * different copy than `entryPath`; otherwise undefined.
 *
 * A Fabric child Pi loads its parent's own Fabric build with `-e` and also the packages in the
 * user's Pi settings. When those settings name another pi-fabric build (the profile switched
 * builds while the parent kept running), both copies would register `fabric_exec` and Pi would
 * refuse to start the child. The command-line copy wins: it matches the worker the parent
 * launched, and Pi itself loads command-line extensions first. When several Fabric copies are on
 * the command line, the first one wins.
 *
 * Only the command line counts, never the environment, so a top-level `pi` that inherits a
 * Fabric child's environment keeps its own Fabric. Any failure to inspect the copies leaves
 * this copy active.
 */
export declare const commandLineFabricCopy: (entryPath: string, commandLine?: FabricCommandLine) => string | undefined;
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