feat: Add Node#getWidth(true) for including js docs in the width (s…

…imilar to `Node#getStart(true)` in the compiler api).

src/compiler/ast/common/Node.ts

@@ -965,9 +965,12 @@ export class Node<NodeType extends ts.Node = ts.Node> {
 
     /**
      * Gets the text length of the node without trivia.
+     * @param includeJsDocComments - Whether to include the JS doc comments in the width or not.
      */
-    getWidth() {
-        return this.compilerNode.getWidth(this._sourceFile.compilerNode);
+    getWidth(includeJsDocComments?: boolean) {
+        // Compiler code is this.getEnd() - this.getStart(sourceFile), but this
+        // takes into account js doc comments as well.
+        return this.getEnd() - this.getStart(includeJsDocComments);
     }
 
     /**

src/tests/compiler/ast/common/nodeTests.ts

@@ -495,6 +495,22 @@ class MyClass {
         });
     });
 
+    describe(nameof<Node>(n => n.getWidth), () => {
+        function doTest(text: string, expectedWidth: number, includeJsDocComment?: boolean) {
+            const { firstChild } = getInfoFromText(text);
+            expect(firstChild.getWidth(includeJsDocComment)).to.equal(expectedWidth);
+        }
+
+        it("should return the width without trivia", () => {
+            doTest("\n  \t  /* comment */ //comment  \r\n  \t enum MyEnum {\n}\n", 15);
+        });
+
+        it("should return the width at the start of the js doc comment if specified", () => {
+            const text = "/**\n * Test\n */\nenum MyEnum {\n}\n";
+            doTest(text, text.length - 1, true);
+        });
+    });
+
     describe(nameof<Node>(n => n.getCombinedModifierFlags), () => {
         const { firstChild } = getInfoFromText<ClassDeclaration>("export class Identifier {}");
         it("should get the combined modifier flags", () => {