export declare const CREDENTIAL_ENV_KEYS: readonly ["JIRA_BASE_URL", "JIRA_EMAIL", "JIRA_API_TOKEN"];
export type CredentialEnvKey = (typeof CREDENTIAL_ENV_KEYS)[number];
export type RawCredentialValues = Partial<Record<CredentialEnvKey, string>>;
/** A named source of raw credential values, keyed by env var name. */
export interface CredentialValueSource {
    read(): RawCredentialValues;
}
/** Reads the current process's own environment. Always tried first. */
export declare class ProcessEnvCredentialSource implements CredentialValueSource {
    private readonly env;
    constructor(env?: NodeJS.ProcessEnv);
    read(): RawCredentialValues;
}