fix jest

babel · Mar 28, 2023 · affd06d · affd06d
1 parent 33492ae
commit affd06d
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/packages/babel-generator/src/printer.ts b/packages/babel-generator/src/printer.ts
@@ -130,6 +130,11 @@ class Printer {
   _indentInnerComments: boolean = true;
 
   generate(ast: t.Node) {
+    // Avoid inserting unexpected blank lines at the beginning and in the middle.
+    if (this.format.retainLines && ast.loc) {
+      this._buf._position.line = ast.loc.start.line;
+    }
+
     this.print(ast);
     this._maybeAddAuxComment();
 
@@ -556,9 +561,9 @@ class Printer {
     if (!this.format.retainLines) return;
 
     // catch up to this nodes newline if we're behind
-    const pos = loc ? loc[prop] : null;
-    if (pos?.line != null) {
-      const count = pos.line - this._buf.getCurrentLine();
+    const line = loc?.[prop]?.line;
+    if (line != null) {
+      const count = line - this._buf.getCurrentLine();
 
       for (let i = 0; i < count; i++) {
         this._newline();