Function assert

src/vs/base/common/assert.ts:44–56

(
	condition: boolean,
	messageOrError: string | Error = 'unexpected state',
)

 * @param messageOrError An error message or error object to throw if condition is `falsy`.
 */
export function assert(
	condition: boolean,
	messageOrError: string | Error = 'unexpected state',
): asserts condition {
	if (!condition) {
		// if error instance is provided, use it, otherwise create a new one
		const errorToThrow = typeof messageOrError === 'string'
			? new BugIndicatingError(`Assertion Failed: ${messageOrError}`)
			: messageOrError;

		throw errorToThrow;
	}
}

/**
 * Like assert, but doesn't throw.