use core.setOutput

Author: yanamura

dist/index.js

@@ -95,10 +95,7 @@ function run() {
         output = output.replace(/\n/g, '%0A');
         output = output.replace(/\r/g, '%0D');
         core.info(output);
-        const setoutputCommand = `echo "diff=${output}" >> $GITHUB_OUTPUT`;
-        exec.exec(setoutputCommand).catch(error => {
-            core.setFailed(error.message);
-        });
+        core.setOutput("diff", output);
     });
 }
 function removeStarLines(inputString, lineBreak = '\n') {

src/main.ts

@@ -65,10 +65,7 @@ async function run(): Promise<void> {
 
   core.info(output)
 
-  const setoutputCommand = `echo "diff=${output}" >> $GITHUB_OUTPUT`
-  exec.exec(setoutputCommand).catch(error => {
-    core.setFailed(error.message)
-  })
+  core.setOutput("diff", output)
 }
 
 function removeStarLines(inputString: string, lineBreak: string = '\n'): string {