Remove placeholder from doc.builders.cursor (#13312)

src/document/builders.js

@@ -208,7 +208,7 @@ const softline = { type: DOC_TYPE_LINE, soft: true };
 const hardline = [hardlineWithoutBreakParent, breakParent];
 const literalline = [literallineWithoutBreakParent, breakParent];
 
-const cursor = { type: DOC_TYPE_CURSOR, placeholder: Symbol("cursor") };
+const cursor = { type: DOC_TYPE_CURSOR };
 
 /**
  * @param {Doc} sep

src/document/printer.js

@@ -18,12 +18,7 @@ import {
   DOC_TYPE_LABEL,
   DOC_TYPE_BREAK_PARENT,
 } from "./constants.js";
-import {
-  fill,
-  cursor,
-  indent,
-  hardlineWithoutBreakParent,
-} from "./builders.js";
+import { fill, indent, hardlineWithoutBreakParent } from "./builders.js";
 import { getDocParts, getDocType } from "./utils.js";
 import InvalidDocError from "./invalid-doc-error.js";
 
@@ -36,6 +31,8 @@ const MODE_BREAK = Symbol("MODE_BREAK");
 /** @type {unique symbol} */
 const MODE_FLAT = Symbol("MODE_FLAT");
 
+const CURSOR_PLACEHOLDER = Symbol("cursor");
+
 function rootIndent() {
   return { value: "", length: 0, queue: [] };
 }
@@ -316,7 +313,7 @@ function printDocToString(doc, options) {
       }
 
       case DOC_TYPE_CURSOR:
-        out.push(cursor.placeholder);
+        out.push(CURSOR_PLACEHOLDER);
         break;
 
       case DOC_TYPE_INDENT:
@@ -605,10 +602,10 @@ function printDocToString(doc, options) {
     }
   }
 
-  const cursorPlaceholderIndex = out.indexOf(cursor.placeholder);
+  const cursorPlaceholderIndex = out.indexOf(CURSOR_PLACEHOLDER);
   if (cursorPlaceholderIndex !== -1) {
     const otherCursorPlaceholderIndex = out.indexOf(
-      cursor.placeholder,
+      CURSOR_PLACEHOLDER,
       cursorPlaceholderIndex + 1
     );
     const beforeCursor = out.slice(0, cursorPlaceholderIndex).join("");