Function assert

packages/pyright-internal/src/common/debug.ts:12–26

(
    expression: any,
    message?: string,
    verboseDebugInfo?: string | (() => string),
    stackCrawlMark?: AnyFunction
)

import { AnyFunction, compareValues, hasProperty, isString } from './core';

export function assert(
    expression: any,
    message?: string,
    verboseDebugInfo?: string | (() => string),
    stackCrawlMark?: AnyFunction
): asserts expression {
    if (!expression) {
        if (verboseDebugInfo) {
            message +=
                '\r\nVerbose Debug Information: ' +
                (typeof verboseDebugInfo === 'string' ? verboseDebugInfo : verboseDebugInfo());
        }
        fail(message ? 'False expression: ' + message : 'False expression.', stackCrawlMark || assert);
    }
}

export function fail(message?: string, stackCrawlMark?: AnyFunction): never {
    // debugger;