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ant/tests/test_fs_promises_filehandle.cjs
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test_fs_promises_filehandle.cjs
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const fs = require('node:fs/promises');
const path = require('node:path');
async function main() {
const file = path.join(__dirname, 'tmp_filehandle.txt');
try {
await fs.unlink(file);
} catch {}
const writer = await fs.open(file, 'w');
if (!writer || typeof writer !== 'object') {
throw new Error(`expected FileHandle object, got ${Object.prototype.toString.call(writer)}`);
}
if (typeof writer.fd !== 'number') {
throw new Error(`expected numeric fd, got ${typeof writer.fd}`);
}
if (typeof writer.writeFile !== 'function') {
throw new Error('expected FileHandle.writeFile()');
}
if (typeof writer.sync !== 'function') {
throw new Error('expected FileHandle.sync()');
}
if (typeof writer.close !== 'function') {
throw new Error('expected FileHandle.close()');
}
await writer.writeFile('hello');
await writer.sync();
const writerStat = await writer.stat();
if (!writerStat || typeof writerStat.size !== 'number' || writerStat.size !== 5) {
throw new Error(`expected stat.size === 5, got ${writerStat && writerStat.size}`);
}
await writer.close();
const reader = await fs.open(file, 'r');
const buf = Buffer.alloc(5);
const readResult = await reader.read(buf, 0, buf.length, 0);
if (!readResult || readResult.bytesRead !== 5) {
throw new Error(`expected bytesRead === 5, got ${readResult && readResult.bytesRead}`);
}
if (readResult.buffer !== buf) {
throw new Error('expected read() to return the original buffer');
}
if (buf.toString('utf8') !== 'hello') {
throw new Error(`expected "hello", got ${JSON.stringify(buf.toString('utf8'))}`);
}
await reader.close();
await fs.unlink(file);
console.log('fs/promises FileHandle works');
}
main().catch((err) => {
console.error(err && err.stack ? err.stack : String(err));
process.exit(1);
});

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