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'use strict';
const common = require('../common');
const assert = require('assert');
const { promisify } = require('util');
const execFile = promisify(require('child_process').execFile);
// Test that --trace-sync-io works. In particular, a warning should be printed
// when it is enabled and synchronous I/O happens after the first event loop
// turn, and no warnings should occur when it is disabled or synchronous I/O
// happens before the first event loop turn is over.
if (process.argv[2] === 'late-sync-io') {
setImmediate(() => {
require('fs').statSync(__filename);
});
return;
} else if (process.argv[2] === 'early-sync-io') {
require('fs').statSync(__filename);
return;
}
(async function() {
for (const { execArgv, variant, warnings } of [
{ execArgv: ['--trace-sync-io'], variant: 'late-sync-io', warnings: 1 },
{ execArgv: [], variant: 'late-sync-io', warnings: 0 },
{ execArgv: ['--trace-sync-io'], variant: 'early-sync-io', warnings: 0 },
{ execArgv: [], variant: 'early-sync-io', warnings: 0 },
]) {
const { stdout, stderr } =
await execFile(process.execPath, [...execArgv, __filename, variant]);
assert.strictEqual(stdout, '');
const actualWarnings =
stderr.match(/WARNING: Detected use of sync API[\s\S]*statSync/g);
if (warnings === 0)
assert.strictEqual(actualWarnings, null);
else
assert.strictEqual(actualWarnings.length, warnings);
}
})().then(common.mustCall());