only update files if they exist in the input tree

Author: mansona

packages/compat/src/compat-adapters/ember-source.ts

@@ -404,6 +404,10 @@ function updateFileWithTransform(
   file: string,
   transformFunction: Babel.PluginItem | Babel.PluginItem[]
 ) {
+  // only update the file if it exists - this helps the codemods to work across many different versions
+  if (!existsSync(resolve(context.inputPaths[0], file))) {
+    return;
+  }
   let inSource = readFileSync(resolve(context.inputPaths[0], file), 'utf8');
 
   let plugins = Array.isArray(transformFunction) ? transformFunction : [transformFunction];
@@ -415,6 +419,10 @@ function updateFileWithTransform(
 }
 
 function replaceFile(context: Plugin, file: string, content: string) {
+  // only update the file if it exists - this helps the codemods to work across many different versions
+  if (!existsSync(resolve(context.inputPaths[0], file))) {
+    return;
+  }
   outputFileSync(resolve(context.outputPath, file), content, 'utf8');
 }