Function checkSwitchStatement

test/fixtures/snapshot/typescript.js:83694–83741

(node)

            }
        }
        function checkSwitchStatement(node) {
            // Grammar checking
            checkGrammarStatementInAmbientContext(node);
            var firstDefaultClause;
            var hasDuplicateDefaultClause = false;
            var expressionType = checkExpression(node.expression);
            var expressionIsLiteral = isLiteralType(expressionType);
            ts.forEach(node.caseBlock.clauses, function (clause) {
                // Grammar check for duplicate default clauses, skip if we already report duplicate default clause
                if (clause.kind === 290 /* SyntaxKind.DefaultClause */ && !hasDuplicateDefaultClause) {
                    if (firstDefaultClause === undefined) {
                        firstDefaultClause = clause;
                    }
                    else {
                        grammarErrorOnNode(clause, ts.Diagnostics.A_default_clause_cannot_appear_more_than_once_in_a_switch_statement);
                        hasDuplicateDefaultClause = true;
                    }
                }
                if (clause.kind === 289 /* SyntaxKind.CaseClause */) {
                    addLazyDiagnostic(createLazyCaseClauseDiagnostics(clause));
                }
                ts.forEach(clause.statements, checkSourceElement);
                if (compilerOptions.noFallthroughCasesInSwitch && clause.fallthroughFlowNode && isReachableFlowNode(clause.fallthroughFlowNode)) {
                    error(clause, ts.Diagnostics.Fallthrough_case_in_switch);
                }
                function createLazyCaseClauseDiagnostics(clause) {
                    return function () {
                        // TypeScript 1.0 spec (April 2014): 5.9
                        // In a 'switch' statement, each 'case' expression must be of a type that is comparable
                        // to or from the type of the 'switch' expression.
                        var caseType = checkExpression(clause.expression);
                        var caseIsLiteral = isLiteralType(caseType);
                        var comparedExpressionType = expressionType;
                        if (!caseIsLiteral || !expressionIsLiteral) {
                            caseType = caseIsLiteral ? getBaseTypeOfLiteralType(caseType) : caseType;
                            comparedExpressionType = getBaseTypeOfLiteralType(expressionType);
                        }
                        if (!isTypeEqualityComparableTo(comparedExpressionType, caseType)) {
                            // expressionType is not comparable to caseType, try the reversed check and report errors if it fails
                            checkTypeComparableTo(caseType, comparedExpressionType, clause.expression, /*headMessage*/ undefined);
                        }
                    };
                }
            });
            if (node.caseBlock.locals) {
                registerForUnusedIdentifiersCheck(node.caseBlock);
            }
        }
        function checkLabeledStatement(node) {
            // Grammar checking
            if (!checkGrammarStatementInAmbientContext(node)) {