import { LogLevel } from './core/constants';
/**
 * Singleton class to manage environment settings for Salesforce DX VSCode automation tests
 *
 * @remarks
 * This class loads configuration from environment variables at initialization time
 */
export declare class EnvironmentSettings {
    private static _instance;
    /**
     * VSCode version to use in tests
     * @env VSCODE_VERSION - VSCode version identifier (vscode-extension-tester standard)
     * @default 'latest'
     */
    private _codeVersion;
    /**
     * Specific test spec files to run
     * @env SPEC_FILES - Test spec filename(s) to run
     * @default []
     */
    private _specFiles;
    /**
     * Path to directory containing VSIX files to install
     * @env VSIX_TO_INSTALL - Path to directory with VSIX files
     * @default undefined
     */
    private _vsixToInstallDir;
    /**
     * DevHub org alias name
     * @env DEV_HUB_ALIAS_NAME - Alias for the DevHub org
     * @default 'vscodeOrg'
     */
    private _devHubAliasName;
    /**
     * DevHub username
     * @env DEV_HUB_USER_NAME - Username for the DevHub org
     */
    private _devHubUserName;
    /**
     * SFDX auth URL for authentication
     * @env SFDX_AUTH_URL - URL for authenticating with Salesforce DX
     * @default undefined
     */
    private _sfdxAuthUrl;
    /**
     * Path to Salesforce DX VSCode extensions
     * @env EXTENSIONS_FOLDER - Path to extensions directory (vscode-extension-tester standard)
     * @default '[project_root]/extensions'
     */
    private _extensionsFolder;
    /**
     * Path to the workspace folder where VS Code and test artifacts are stored
     * @env TEST_RESOURCES - Path to workspace directory (vscode-extension-tester standard)
     * @default '[project_root]/test-resources'
     */
    private _testResources;
    /**
     * Chrome driver arguments
     * @env VSCODE_EXTENSION_TESTER_CHROMEDRIVER_ARGS - Arguments for Chrome driver
     * @default undefined
     */
    private _chromeDriverArgs;
    /**
     * Test execution start time
     * @default current time formatted as short time string
     */
    private _startTime;
    /**
     * Factor to slow down test execution
     * @env THROTTLE_FACTOR - Number to multiply timeouts by
     * @default 1
     */
    private _throttleFactor;
    /**
     * Java home directory path
     * @env JAVA_HOME - Path to Java installation
     * @default undefined
     */
    private _javaHome;
    /**
     * Path to an existing project to use instead of creating a new one
     * @env USE_EXISTING_PROJECT_PATH - Path to existing project directory
     * @default undefined
     */
    private _useExistingProject;
    /**
     * Log level for test execution
     * @env E2E_LOG_LEVEL - One of the valid log levels defined in LOG_LEVELS
     * @default 'info'
     */
    private _logLevel;
    /**
     * Private constructor that loads all settings from environment variables
     * Follows the Singleton pattern - use getInstance() to access
     */
    private constructor();
    /**
     * Returns the singleton instance of EnvironmentSettings
     * Creates the instance if it doesn't exist
     */
    static getInstance(): EnvironmentSettings;
    /** Gets the VSCode version to use in tests */
    get vscodeVersion(): string;
    /** @deprecated Use vscodeVersion instead */
    get codeVersion(): string;
    /** Gets the spec files to run */
    get specFiles(): string[];
    /** Gets the DevHub org alias name */
    get devHubAliasName(): string;
    /** Gets the DevHub username */
    get devHubUserName(): string | undefined;
    /** Gets the path to Salesforce DX VSCode extensions */
    get extensionPath(): string;
    /** Gets the path to Salesforce DX VSCode extensions (aligned with env var name) */
    get extensionsFolder(): string;
    /** Gets the throttle factor for slowing down test execution */
    get throttleFactor(): number;
    /** Gets the test execution start time */
    get startTime(): string;
    /** Gets the SFDX auth URL for authentication */
    get sfdxAuthUrl(): string | undefined;
    /** Gets the Java home directory path */
    get javaHome(): string | undefined;
    /** Gets the path to an existing project */
    get useExistingProject(): string | undefined;
    /**
     * Sets the path to an existing project
     * @param existingProject Path to the project directory
     * @throws Error if the specified path does not exist
     */
    set useExistingProject(existingProject: string | undefined);
    /** Gets the workspace path where VS Code and test artifacts are stored */
    get workspacePath(): string;
    /** Gets the test resources path (aligned with env var name) */
    get testResources(): string;
    /** Gets the log level for test execution */
    get logLevel(): LogLevel;
    /** Gets the Chrome driver arguments */
    get chromeDriverArgs(): string | undefined;
    /** Gets the Chrome driver arguments (more explicit naming) */
    get vscodeExtensionTesterChromeDriverArgs(): string | undefined;
    /** Gets the directory containing VSIX files to install */
    get vsixToInstallDir(): string | undefined;
}