Reduce redundant preparation in bench scripts

Author: andrewiggins

.github/workflows/benchmarks.yml

@@ -42,6 +42,7 @@ jobs:
           npm pack --ignore-scripts
           mv preact-*.tgz preact.tgz
           tar -xzf preact.tgz
+          rm preact.tgz
       - name: Upload build output
         uses: actions/upload-artifact@v2
         with:

benches/TODO.md

@@ -8,4 +8,3 @@
 * Add bench mimicking speedometer
 * Add a realworld-like bench?
 * Add a specialized bench that hits certain code paths other's miss (e.g. style attribute handling?)
-* Add analyze script and PR to add --trace to tachometer

benches/scripts/config.js

@@ -228,10 +228,6 @@ export async function generateConfig(benchPath, options) {
 			continue;
 		}
 
-		if (options.prepare !== false) {
-			await prepare(framework.label);
-		}
-
 		benchmarks.push({
 			...baseBenchConfig,
 			packageVersions: framework,
@@ -240,6 +236,10 @@ export async function generateConfig(benchPath, options) {
 		});
 	}
 
+	if (options.prepare !== false) {
+		await prepare(benchmarks.map(b => b.packageVersions.label));
+	}
+
 	/** @type {ConfigFile} */
 	const config = {
 		$schema: TACH_SCHEMA,

benches/scripts/prepare.js

@@ -7,16 +7,22 @@ import { repoRoot } from './utils.js';
 const npmCmd = process.platform == 'win32' ? 'npm.cmd' : 'npm';
 
 /**
- * @param {TachometerOptions["framework"]} framework
+ * @param {string[]} frameworks
  */
-export async function prepare(framework) {
+export async function prepare(frameworks) {
 	const proxyRoot = repoRoot('benches/proxy-packages');
-	for (let dirname of await readdir(proxyRoot)) {
-		if (!framework.includes(dirname.replace(/-proxy/g, ''))) {
+	const proxyDirs = (await readdir(proxyRoot)).map(dirname =>
+		dirname.replace(/-proxy$/, '')
+	);
+
+	for (let framework of frameworks) {
+		const dirname = proxyDirs.find(dir => dir == framework);
+		if (dirname == null) {
 			continue;
 		}
 
-		const proxyDir = (...args) => path.join(proxyRoot, dirname, ...args);
+		const proxyDir = (...args) =>
+			path.join(proxyRoot, dirname + '-proxy', ...args);
 
 		// It appears from ad-hoc testing (npm v6.14.9 on Windows), npm will cache
 		// any locally referenced tarball files (e.g. "file:../../../preact.tgz") in