/**
 * Classify a failed regression/test command's output as a *diagnosed
 * environment failure* — something the sandbox cannot provide (a missing system
 * library, no display, no root) rather than a genuine code regression.
 *
 * When `defaults.environmentFailureOnce` is on, the regression loop records such
 * a failure once ("could not run, and why") and continues, instead of re-running
 * and re-reporting it up to five times. Run 2 (vscode-project-manager #947)
 * retried the same `libnspr4.so` loader failure five times — this classifier
 * stops that.
 *
 * Deterministic and pure. House style: a `Record` lookup table of signature →
 * human reason (no `switch`). Signatures are anchored to specific loader/display/
 * privilege phrases so ordinary log noise (a test that merely prints "cannot
 * open display" in passing) does not trip it — and the classifier is only ever
 * run on a command that actually FAILED (non-zero exit).
 */
export interface EnvironmentFailureResult {
    isEnvironmentFailure: boolean;
    /** The matched human reason, or null when not an environment failure. */
    reason: string | null;
}
/**
 * Inspect `output` for a known environment-failure signature. Returns
 * `{ isEnvironmentFailure, reason }`; `reason` is the matched human string or
 * null. Empty/whitespace output never classifies as an environment failure.
 */
export declare function classifyEnvironmentFailure(output: string): EnvironmentFailureResult;
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