feat: add comment-body output

action.yml

@@ -50,6 +50,10 @@ inputs:
     description: 'The column and direction to sort the results by. The format is "column:direction", where column is one of "Filename", "Size", or "Change" and direction is "asc" or "desc". For example, "Size:desc" sorts the table by file size in descending order.'
     default: 'Filename:asc'
 
+outputs:
+  comment-body:
+    description: 'The full Markdown body the action posts to the PR, including the size report and footer.'
+
 runs:
   using: 'node24'
   main: 'index.js'

src/index.js

@@ -2,7 +2,7 @@ import { getInput, setFailed, startGroup, endGroup, debug } from '@actions/core'
 import { context, getOctokit } from '@actions/github';
 import { exec } from '@actions/exec';
 import { SizePlugin } from '@rschristian/size-plugin';
-import { getPackageManagerAndInstallScript, diffTable, toBool, stripHash, getSortOrder } from './utils.js';
+import { getPackageManagerAndInstallScript, diffTable, toBool, stripHash, getSortOrder, setOutput } from './utils.js';
 
 /**
  * @typedef {ReturnType<typeof import("@actions/github").getOctokit>} Octokit
@@ -170,6 +170,8 @@ async function run(octokit, context, token) {
 			`\n\n<a href="https://github.com/preactjs/compressed-size-action"><sub>compressed-size-action${commentKey ? `::${commentKey}` : ''}</sub></a>`
 	};
 
+	setOutput('comment-body', comment.body);
+
 	if (context.eventName !== 'pull_request' && context.eventName !== 'pull_request_target') {
 		console.log('No PR associated with this action run. Not posting a check or comment.');
 		outputRawMarkdown = false;

src/utils.js

@@ -1,5 +1,6 @@
 import fs from 'fs';
 import path from 'path';
+import { EOL } from 'os';
 import prettyBytes from 'pretty-bytes';
 
 /**
@@ -269,3 +270,22 @@ export function getSortOrder(sortBy) {
 	console.warn(`Invalid 'order-by' value '${sortBy}', defaulting to 'Filename:asc'`);
 	return 'Filename:asc';
 }
+
+/**
+ * 
+ * @param {string} name
+ * @param {string} value
+ */
+export function setOutput(name, value) {
+	const outputPath = process.env.GITHUB_OUTPUT;
+
+	if (outputPath) {
+		const delimiter = `ghadelimiter_${Date.now()}`;
+		fs.appendFileSync(outputPath, `${name}<<${delimiter}${EOL}${value}${EOL}${delimiter}${EOL}`);
+		return;
+	}
+
+	console.log(
+		`::set-output name=${name}::${String(value).replace(/\n/g, '%0A').replace(/\r/g, '%0D')}`
+	);
+}