initial commit

.gitignore

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+node_modules

action.js

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+import { getInput, setFailed } from '@actions/core';
+import { GitHub, context } from '@actions/github';
+import { exec } from '@actions/exec';
+import SizePlugin from 'size-plugin-core';
+
+
+async function run(octokit, context) {
+	const { owner, repo, number: pull_number } = context.issue;
+	const pr = (await octokit.pulls.get({ owner, repo, pull_number })).data;
+
+	const plugin = new SizePlugin({
+		pattern: process.env.PATTERN || [
+			'dist/*.js',
+			'**/dist/*.js'
+		],
+		exclude: '*.map'
+	});
+
+	const cwd = process.cwd();
+
+	console.log('computing new sizes');
+	await exec(`npm ci && npm run build`);
+	const newSizes = await plugin.readFromDisk(cwd);
+
+	console.log('computing old sizes');
+	await exec(`git checkout ${pr.base.sha}`);
+	await exec(`npm ci && npm run build`);
+	const oldSizes = await plugin.readFromDisk(cwd);
+
+	const diff = await plugin.getDiff(oldSizes, newSizes);
+
+	const text = await plugin.printSizes(diff);
+
+	await octokit.issues.createComment({
+		...context.repo,
+		issue_number: pull_number,
+		body: `Size updates:\n\n\n\n\`\`\`\n${text}\n\`\`\``,
+	});
+}
+
+export default async () => {
+	try {
+		const token = getInput('repo-token', { required: true });
+		const octokit = new GitHub(token);
+		await run(octokit, context);
+	} catch (e) {
+		setFailed(e.message);
+	}
+};

action.yml

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+name: 'gzip-size action'
+description: 'Get compressed size differences for every PR'
+author: 'Jason Miller'
+branding:
+  icon: 'archive'
+  color: 'purple'
+inputs:
+  repo-token:
+    description: 'The GITHUB_TOKEN secret'
+runs:
+  using: 'node12'
+  main: 'index.js'

index.js

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+require('esm')();
+require('./action');