/**
 * Identifies a specific profile+region combination in which tests are executed
 */
export interface TestEnvironment {
    /**
     * The AWS profile used for the environment
     *
     * @default - default credentials
     */
    readonly profile?: string;
    /**
     * The AWS region of the environment
     */
    readonly region: string;
    /**
     * The AWS account of the environment, if known
     *
     * The account is usually only discovered once a test has run in the
     * environment, e.g. from a bootstrap error.
     *
     * @default - account is not known
     */
    readonly account?: string;
}
/**
 * An environment that was removed from the pool, and why
 */
export interface RemovedEnvironment extends TestEnvironment {
    /**
     * Human-readable reason for the removal
     */
    readonly reason: string;
}
/**
 * Summary of the state of the environment pool
 */
export interface EnvironmentSummary {
    /**
     * Environments that were removed from the pool during the test run
     */
    readonly removed: RemovedEnvironment[];
}
/**
 * Tracks which test environments (profile+region combinations) are still
 * usable during an integration test run.
 *
 * When a test discovers that an environment is unusable (e.g. it is not
 * bootstrapped), the environment is removed from the pool so no further
 * tests are scheduled there, and the removal is recorded for reporting.
 */
export declare class EnvironmentPool {
    private readonly available;
    private readonly removed;
    constructor(environments: TestEnvironment[]);
    /**
     * Whether the given environment is still available for running tests
     */
    isAvailable(env: TestEnvironment): boolean;
    /**
     * Whether any environment is still available for running tests
     */
    hasAvailable(): boolean;
    /**
     * Remove an environment from the pool
     *
     * Only known, still-available environments are removed; removing the same
     * environment twice keeps the first removal record.
     *
     * @returns `true` if the environment was available and has now been removed
     */
    remove(env: TestEnvironment, reason: string): boolean;
    /**
     * Summary of removed environments, for end-of-run reporting
     */
    summary(): EnvironmentSummary;
}
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