Function buildSnapshot

benchmark/v8/startup-snapshot-callbacks.js:17–33

(snapshotBlob, fixtureScript, count)

});

function buildSnapshot(snapshotBlob, fixtureScript, count) {
  writeFileSync(fixtureScript, `
'use strict';
const v8 = require('node:v8');
for (let i = 0; i < ${count}; i++) {
  v8.startupSnapshot.addDeserializeCallback(() => {});
}
v8.startupSnapshot.setDeserializeMainFunction(() => {});
`);
  const result = spawnSync(process.execPath, [
    '--snapshot-blob', snapshotBlob,
    '--build-snapshot', fixtureScript,
  ]);
  if (result.status !== 0) {
    throw new Error(`Failed to build snapshot:\n${result.stderr}`);
  }
}

function main({ n, count }) {
  const dir = mkdtempSync(path.join(tmpdir(), 'node-bench-snapshot-'));