Fix type of isIterationStatement (microsoft#22065)

Andy · web-flow · commit 928ffaa1b517 · 2018-03-01T13:12:18.000-08:00
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
@@ -5578,6 +5578,8 @@ namespace ts {
 
     // Statement
 
+    export function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
+    export function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
     export function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement {
         switch (node.kind) {
             case SyntaxKind.ForStatement:
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -3231,7 +3231,8 @@ declare namespace ts {
     function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
     function isTemplateLiteral(node: Node): node is TemplateLiteral;
     function isAssertionExpression(node: Node): node is AssertionExpression;
-    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement;
+    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
+    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
     function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
     function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
     /** True if node is of a kind that may contain comment text. */
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
@@ -3286,7 +3286,8 @@ declare namespace ts {
     function isCallOrNewExpression(node: Node): node is CallExpression | NewExpression;
     function isTemplateLiteral(node: Node): node is TemplateLiteral;
     function isAssertionExpression(node: Node): node is AssertionExpression;
-    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement;
+    function isIterationStatement(node: Node, lookInLabeledStatements: false): node is IterationStatement;
+    function isIterationStatement(node: Node, lookInLabeledStatements: boolean): node is IterationStatement | LabeledStatement;
     function isJsxOpeningLikeElement(node: Node): node is JsxOpeningLikeElement;
     function isCaseOrDefaultClause(node: Node): node is CaseOrDefaultClause;
     /** True if node is of a kind that may contain comment text. */
