/**
 * Extension startup failures.
 *
 * A session whose extensions fail `session_start` or `resources_discover` is
 * rolled back and rejects with one `ExtensionStartupError`. Its message and
 * `failures` name every failing extension and its own error, so callers can
 * report and classify the failure without reading `AggregateError.errors`.
 */
export declare const EXTENSION_STARTUP_FAILED_CODE = "ExtensionStartupFailed";
export interface ExtensionStartupFailure {
    readonly extensionPath: string;
    readonly event: string;
    readonly message: string;
}
export declare class ExtensionStartupError extends AggregateError {
    readonly code = "ExtensionStartupFailed";
    readonly failures: readonly ExtensionStartupFailure[];
    constructor(failures: readonly ExtensionStartupFailure[]);
}
/** True when `error` is, or aggregates, an extension startup failure. */
export declare function isExtensionStartupFailure(error: unknown): boolean;
/**
 * True when a fresh session may succeed: every failing extension reported a
 * load- or timing-dependent error. A startup failure whose rollback also failed
 * is never transient, so its ownership problems are not retried over.
 */
export declare function isTransientExtensionStartupFailure(error: unknown): boolean;
/** Message for an aggregate that wraps a startup failure with the errors its cleanup reported. */
export declare function startupCleanupFailureMessage(summary: string, errors: readonly unknown[]): string;
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