/**
 * Points this process's temp directory at a run root it owns, creating the root
 * on first call and reusing it afterwards.
 *
 * All three of `TMPDIR`, `TMP` and `TEMP` are set: Node reads `TMPDIR` on POSIX
 * and `TEMP`/`TMP` on Windows, and non-Node tools spawned by fixtures read
 * whichever their platform prefers. Setting one would leave the others pointing
 * at the shared directory for exactly the callers hardest to see.
 * @returns Absolute path of this process's run root.
 */
export declare const installScratchRoot: () => string;
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