Function helper

test/fixtures/snapshot/typescript.js:82699–82739

(condExpr, body)

                helper(condExpr, body);
            }
            function helper(condExpr, body) {
                var location = ts.isBinaryExpression(condExpr) &&
                    (condExpr.operatorToken.kind === 56 /* SyntaxKind.BarBarToken */ || condExpr.operatorToken.kind === 55 /* SyntaxKind.AmpersandAmpersandToken */)
                    ? condExpr.right
                    : condExpr;
                if (ts.isModuleExportsAccessExpression(location))
                    return;
                var type = checkTruthinessExpression(location);
                var isPropertyExpressionCast = ts.isPropertyAccessExpression(location) && isTypeAssertion(location.expression);
                if (getFalsyFlags(type) || isPropertyExpressionCast)
                    return;
                // While it technically should be invalid for any known-truthy value
                // to be tested, we de-scope to functions and Promises unreferenced in
                // the block as a heuristic to identify the most common bugs. There
                // are too many false positives for values sourced from type
                // definitions without strictNullChecks otherwise.
                var callSignatures = getSignaturesOfType(type, 0 /* SignatureKind.Call */);
                var isPromise = !!getAwaitedTypeOfPromise(type);
                if (callSignatures.length === 0 && !isPromise) {
                    return;
                }
                var testedNode = ts.isIdentifier(location) ? location
                    : ts.isPropertyAccessExpression(location) ? location.name
                        : ts.isBinaryExpression(location) && ts.isIdentifier(location.right) ? location.right
                            : undefined;
                var testedSymbol = testedNode && getSymbolAtLocation(testedNode);
                if (!testedSymbol && !isPromise) {
                    return;
                }
                var isUsed = testedSymbol && ts.isBinaryExpression(condExpr.parent) && isSymbolUsedInBinaryExpressionChain(condExpr.parent, testedSymbol)
                    || testedSymbol && body && isSymbolUsedInConditionBody(condExpr, body, testedNode, testedSymbol);
                if (!isUsed) {
                    if (isPromise) {
                        errorAndMaybeSuggestAwait(location, 
                        /*maybeMissingAwait*/ true, ts.Diagnostics.This_condition_will_always_return_true_since_this_0_is_always_defined, getTypeNameForErrorDisplay(type));
                    }
                    else {
                        error(location, ts.Diagnostics.This_condition_will_always_return_true_since_this_function_is_always_defined_Did_you_mean_to_call_it_instead);
                    }
                }
            }
        }
        function isSymbolUsedInConditionBody(expr, body, testedNode, testedSymbol) {
            return !!ts.forEachChild(body, function check(childNode) {