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benchmark: rewrite detect-esm-syntax benchmark #55238

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Merged
merged 1 commit into from
Oct 9, 2024
+16 −17
Merged

benchmark: rewrite detect-esm-syntax benchmark #55238

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33 changes: 16 additions & 17 deletions benchmark/esm/detect-esm-syntax.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,34 +4,33 @@
// We use the TypeScript fixture because it's a very large CommonJS file with no ESM syntax: the worst case.
const common = require('../common.js');
const tmpdir = require('../../test/common/tmpdir.js');
const fixtures = require('../../test/common/fixtures.js');
const scriptPath = fixtures.path('snapshot', 'typescript.js');
const fs = require('node:fs');

const bench = common.createBenchmark(main, {
type: ['with-module-syntax-detection', 'without-module-syntax-detection'],
type: ['with-package-json', 'without-package-json'],
n: [1e4],
}, {
flags: ['--experimental-detect-module'],
});

const benchmarkDirectory = tmpdir.fileURL('benchmark-detect-esm-syntax');
const ambiguousURL = new URL('./typescript.js', benchmarkDirectory);
const explicitURL = new URL('./typescript.cjs', benchmarkDirectory);

async function main({ n, type }) {
tmpdir.refresh();
fs.mkdirSync(tmpdir.resolve('bench'));

fs.mkdirSync(benchmarkDirectory, { recursive: true });
fs.cpSync(scriptPath, ambiguousURL);
fs.cpSync(scriptPath, explicitURL);

bench.start();

let loader = '';
const modules = [];
for (let i = 0; i < n; i++) {
const url = type === 'with-module-syntax-detection' ? ambiguousURL : explicitURL;
await import(url);
const url = tmpdir.fileURL('bench', `mod${i}.js`);
fs.writeFileSync(url, `const foo${i} = ${i};\nexport { foo${i} };\n`);
loader += `import { foo${i} } from './mod${i}.js';\n`;
modules.push(url);
}
const loaderURL = tmpdir.fileURL('bench', 'load.js');
fs.writeFileSync(loaderURL, loader);

if (type === 'with-package-json') {
fs.writeFileSync(tmpdir.resolve('bench', 'package.json'), '{ "type": "module" }');
}

bench.start();
await import(loaderURL);
bench.end(n);
}
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