/**
 * In DEV environment, emits an error message.
 * This is usally used to indicate a critial failure during development process.
 *
 * @param message message content.
 * @remarks
 * In DEV mode, this function will
 * * show user an alert message box (if `confirm` or `alert` function is available in global scope),
 * * trigger a `debugger` breakpoint,
 * * throw an error to the caller,
 *   * This means if there is error handler (`try...catch`) present on the stack trace, such unhandled error might
 *     cause unexpected behavior (as there is an unhandled error bubbling up).
 * * and signal the failure with `console.assert` function.
 * In PROD mode, this function does nothing. Bundler should be optimizing such call away.
 *
 * Thus, please note that this function may or may not stop the caller's code execution.
 */
export declare function fail(message?: string): void;
/**
 * Checks for a condition; if the condition is `false`,
 * outputs messages and shows the call stack with {@link fail} function.
 *
 * @param condition the condition to check.
 * @param message the message to display when the condition is falsy.
 */
export declare function assert(condition: boolean, message?: string): asserts condition;
/**
 * Checks for a condition; if the condition is [falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy)
 * (e.g., `false`, `null`, `undefined`, `0`, `""`),
 * outputs messages and shows the call stack with {@link fail} function.
 *
 * @param condition the condition to check.
 * @param message the message to display when the condition is falsy.
 */
export declare function assert(condition: unknown, message?: string): asserts condition;
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