Function narrowTypeByAssertion

test/fixtures/snapshot/typescript.js:70486–70500

(type, expr)

                return undefined;
            }
            function narrowTypeByAssertion(type, expr) {
                var node = ts.skipParentheses(expr, /*excludeJSDocTypeAssertions*/ true);
                if (node.kind === 95 /* SyntaxKind.FalseKeyword */) {
                    return unreachableNeverType;
                }
                if (node.kind === 221 /* SyntaxKind.BinaryExpression */) {
                    if (node.operatorToken.kind === 55 /* SyntaxKind.AmpersandAmpersandToken */) {
                        return narrowTypeByAssertion(narrowTypeByAssertion(type, node.left), node.right);
                    }
                    if (node.operatorToken.kind === 56 /* SyntaxKind.BarBarToken */) {
                        return getUnionType([narrowTypeByAssertion(type, node.left), narrowTypeByAssertion(type, node.right)]);
                    }
                }
                return narrowType(type, node, /*assumeTrue*/ true);
            }
            function getTypeAtFlowCall(flow) {
                var signature = getEffectsSignature(flow.node);
                if (signature) {