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'use strict';
const common = require('../common');
const assert = require('assert');
const fs = require('fs');
const path = require('path');
const tmpdir = require('../common/tmpdir');
const enoentFile = path.join(tmpdir.path, 'non-existent-file');
const expectedStatObject = new fs.Stats(
0n, // dev
0n, // mode
0n, // nlink
0n, // uid
0n, // gid
0n, // rdev
common.isWindows ? undefined : 0n, // blksize
0n, // ino
0n, // size
common.isWindows ? undefined : 0n, // blocks
0n, // atim_msec
0n, // mtim_msec
0n, // ctim_msec
0n // birthtim_msec
);
tmpdir.refresh();
// If the file initially didn't exist, and gets created at a later point of
// time, the callback should be invoked again with proper values in stat object
let fileExists = false;
const options = { interval: 0, bigint: true };
const watcher =
fs.watchFile(enoentFile, options, common.mustCall((curr, prev) => {
if (!fileExists) {
// If the file does not exist, all the fields should be zero and the date
// fields should be UNIX EPOCH time
assert.deepStrictEqual(curr, expectedStatObject);
assert.deepStrictEqual(prev, expectedStatObject);
// Create the file now, so that the callback will be called back once the
// event loop notices it.
fs.closeSync(fs.openSync(enoentFile, 'w'));
fileExists = true;
} else {
// If the ino (inode) value is greater than zero, it means that the file
// is present in the filesystem and it has a valid inode number.
assert(curr.ino > 0n);
// As the file just got created, previous ino value should be lesser than
// or equal to zero (non-existent file).
assert(prev.ino <= 0n);
// Stop watching the file
fs.unwatchFile(enoentFile);
watcher.stop(); // stopping a stopped watcher should be a noop
}
}, 2));
// 'stop' should only be emitted once - stopping a stopped watcher should
// not trigger a 'stop' event.
watcher.on('stop', common.mustCall(function onStop() {}));
watcher.start(); // starting a started watcher should be a noop
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