Add createRegularExpressionLiteral and expose createStringLiteral

Fixes: microsoft#23992

Author: ajafff

src/compiler/factory.ts

@@ -93,12 +93,18 @@ namespace ts {
         return node;
     }
 
-    function createStringLiteral(text: string): StringLiteral {
+    export function createStringLiteral(text: string): StringLiteral {
         const node = <StringLiteral>createSynthesizedNode(SyntaxKind.StringLiteral);
         node.text = text;
         return node;
     }
 
+    export function createRegularExpressionLiteral(text: string): RegularExpressionLiteral {
+        const node = <RegularExpressionLiteral>createSynthesizedNode(SyntaxKind.RegularExpressionLiteral);
+        node.text = text;
+        return node;
+    }
+
     function createLiteralFromNode(sourceNode: PropertyNameLiteral): StringLiteral {
         const node = createStringLiteral(getTextOfIdentifierOrLiteral(sourceNode));
         node.textSourceNode = sourceNode;

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -3484,6 +3484,8 @@ declare namespace ts {
     function createLiteral(value: boolean): BooleanLiteral;
     function createLiteral(value: string | number | boolean): PrimaryExpression;
     function createNumericLiteral(value: string): NumericLiteral;
+    function createStringLiteral(text: string): StringLiteral;
+    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
     function createIdentifier(text: string): Identifier;
     function updateIdentifier(node: Identifier): Identifier;
     /** Create a unique temporary variable. */

tests/baselines/reference/api/typescript.d.ts

@@ -3484,6 +3484,8 @@ declare namespace ts {
     function createLiteral(value: boolean): BooleanLiteral;
     function createLiteral(value: string | number | boolean): PrimaryExpression;
     function createNumericLiteral(value: string): NumericLiteral;
+    function createStringLiteral(text: string): StringLiteral;
+    function createRegularExpressionLiteral(text: string): RegularExpressionLiteral;
     function createIdentifier(text: string): Identifier;
     function updateIdentifier(node: Identifier): Identifier;
     /** Create a unique temporary variable. */