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How to use the openSync function from fs

Find comprehensive JavaScript fs.openSync code examples handpicked from public code repositorys.

fs.openSync is a synchronous method in Node.js that opens a file and returns its file descriptor.

00005-nodejs-file-system.md?plain=1

GitHub: ddean2009/www.flydean.com

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~~~js
const fs = require('fs')

try {
  const fd = fs.openSync('/tmp/flydean.txt', 'r')
} catch (err) {
  console.error(err)
}
~~~

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+ 5 other calls in file

config.js

GitHub: DataDog/dd-trace-js

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}


function maybePath (filepath) {
  if (!filepath) return
  try {
    fs.openSync(filepath, 'r')
    return filepath
  } catch (e) {
    return undefined
  }

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How does fs.openSync work?

fs.openSync is a synchronous method in Node.js's fs module used to open a file with a specified flag and mode, returning a file descriptor that can be used for subsequent read or write operations.

fs.js

GitHub: blockcollider/bcnode

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exports.mkdir = co.promisify(fs.mkdir);
exports.mkdirSync = fs.mkdirSync;
exports.mkdtemp = co.promisify(fs.mkdtemp);
exports.mkdtempSync = fs.mkdtempSync;
exports.open = co.promisify(fs.open);
exports.openSync = fs.openSync;
exports.read = co.promisify(fs.read);
exports.readSync = fs.readSync;
exports.readdir = co.promisify(fs.readdir);
exports.readdirSync = fs.readdirSync;

%E6%8E%A2%E7%B4%A2RxJS-CoreConcept.md?plain=1

GitHub: ecmadao/Coding-Guide

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function readAsync(fd, chunkSize) { /* impl */ }
function appendAsync(fd, buffer) { /* impl */ }
function encrypt(buffer) { /* impl */}

// 打开一个 4GB 的文件，每次只读取 64k
var inFile = fs.openSync('4GBfile.txt', 'r+');
var outFile = fs.openSync('Encrypted.txt', 'w+');

readAsync(inFile, 2 << 15)
  .map(encrypt)

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+ 3 other calls in file

Ai Example

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const fs = require("fs");

try {
  const fileDescriptor = fs.openSync("example.txt", "w");
  console.log(`File descriptor: ${fileDescriptor}`);
} catch (err) {
  console.error(err);
}

In this example, we use fs.openSync to open a file named "example.txt" in write mode. The function returns a file descriptor, which we then log to the console. If there was an error, it will be caught and logged to the console.

update_cards.js

GitHub: dekkerglen/CubeCobra

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const stringifyStream = json.createStringifyStream({
  body: data,
});

// create empty file
const fd = fs.openSync(filepath, 'w');

stringifyStream.on('data', (strChunk) => {
  fs.writeSync(fd, strChunk);
});

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test-fs-chmod.js

GitHub: alibaba/AliOS-nodejs

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let mode_sync;


// Need to hijack fs.open/close to make sure that things
// get closed once they're opened.
fs._open = fs.open;
fs._openSync = fs.openSync;
fs.open = open;
fs.openSync = openSync;
fs._close = fs.close;
fs._closeSync = fs.closeSync;

test-fs-utimes.js

GitHub: nwjs/node

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fs.utimes(pathType('foobarbaz'), atime, mtime, common.mustCall((err) => {
  expect_errno('utimes', 'foobarbaz', err, 'ENOENT');

  // don't close this fd
  if (common.isWindows) {
    fd = fs.openSync(tmpdir.path, 'r+');
  } else {
    fd = fs.openSync(tmpdir.path, 'r');
  }

+ 3 other calls in file

test-trace-events-fs-sync.js

GitHub: nwjs/node

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                             'fs.unlinkSync("fs7.txt")';
tests['fs.sync.fstat'] = 'fs.writeFileSync("fs8.txt", "123", "utf8");' +
                         'fs.readFileSync("fs8.txt");' +
                         'fs.unlinkSync("fs8.txt")';
tests['fs.sync.fsync'] = 'fs.writeFileSync("fs9.txt", "123", "utf8");' +
                         'const fd = fs.openSync("fs9.txt", "r+");' +
                         'fs.fsyncSync(fd);' +
                         'fs.unlinkSync("fs9.txt")';
tests['fs.sync.ftruncate'] = 'fs.writeFileSync("fs10.txt", "123", "utf8");' +
                             'const fd = fs.openSync("fs10.txt", "r+");' +

+ 11 other calls in file

test-fs-error-messages.js

GitHub: nwjs/node

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  };


  fs.open(nonexistentFile, 'r', 0o666, common.mustCall(validateError));


  assert.throws(
    () => fs.openSync(nonexistentFile, 'r', 0o666),
    validateError
  );
}

test-fs-truncate.js

GitHub: grangerecords/anyka

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stat = fs.statSync(filename);
assert.equal(stat.size, 0);


// ftruncateSync
fs.writeFileSync(filename, data);
var fd = fs.openSync(filename, 'r+');


stat = fs.statSync(filename);
assert.equal(stat.size, 1024 * 16);

2_export_graph.js

GitHub: MichaelKreil/twitter-analysis2

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function saveStream() {
	var maxCount = 1024*1024;
	var array = new Uint32Array(maxCount*3);
	var count = 0;
	var file = fs.openSync('../data/g_edges.bin', 'w');




	edgeDB.createValueStream()
		.on('data', function (data) {

unpack.js

GitHub: zeeoneofficial/node_modules

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}

let stream
let fd
try {
  fd = fs.openSync(entry.absolute, 'w', mode)
} catch (er) {
  return oner(er)
}
const tx = this.transform ? this.transform(entry) || entry : entry

index.js

GitHub: kyriosli/node-zip

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 * @param file a filename, or a fd, or a buffer
 * @returns {*}
 */
exports.unzip = function (file) {
    if (typeof file === 'string') {
        file = fs.openSync(file, 'r');
    }
    if (typeof file === 'number') {
        return zipFile(fs.fstatSync(file).size, function (offset, length) {
            var buf = new Buffer(length);

create-app.cjs

GitHub: Tracktor/create-boilerplate-vite-react-ts

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  return data.join("") + "\n";
}


const buildAppFile = () => {
  const file = "src/App.tsx";
  const fd = openSync(file, "w+");
  const data = getAppData();
  const buffer = Buffer.from(data);


  writeSync(fd, buffer, 0, buffer.length, 0); //write new data

index.js

GitHub: Monuwarhussen/CSE---3200-project

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}


class TouchSync extends Touch {
  open () {
    try {
      this.onopen(null, fs.openSync(this.path, this.oflags))
    } catch (er) {
      this.onopen(er)
    }
  }

+ 2 other calls in file

temp.js

GitHub: ds-sampaio/ClicouChegouApp

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  });
}


function openSync(affixes) {
  var filePath = generateName(affixes, 'f-');
  var fd = fs.openSync(filePath, RDWR_EXCL, 0600);
  deleteFileOnExit(filePath);
  return {path: filePath, fd: fd};
}

tmp.js

GitHub: ds-sampaio/ClicouChegouApp

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opts.postfix = opts.postfix || '.tmp';

const discardOrDetachDescriptor = opts.discardDescriptor || opts.detachDescriptor;
const name = tmpNameSync(opts);
var fd = fs.openSync(name, CREATE_FLAGS, opts.mode || FILE_MODE);
if (opts.discardDescriptor) {
  fs.closeSync(fd); 
  fd = undefined;
}

unpack.js

GitHub: RumanSanghera/Receipt-Scanner

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  done()
}

let fd
try {
  fd = fs.openSync(entry.absolute, getFlag(entry.size), mode)
} catch (er) {
  return oner(er)
}
const tx = this.transform ? this.transform(entry) || entry : entry

+ 4 other calls in file

test-trace-events-fs-async.js

GitHub: Mike7323/Mike-s-construction

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}


function fchmod() {
  const fs = require('fs');
  fs.writeFileSync('fs5.txt', '123', 'utf8');
  const fd = fs.openSync('fs5.txt', 'r+');
  fs.fchmod(fd, 100, () => {
    fs.unlinkSync('fs5.txt');
  });
}

+ 17 other calls in file

replace.js

GitHub: RumanSanghera/Receipt-Scanner

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try {
  try {
    fd = fs.openSync(opt.file, 'r+')
  } catch (er) {
    if (er.code === 'ENOENT') {
      fd = fs.openSync(opt.file, 'w+')
    } else {
      throw er
    }
  }

+ 3 other calls in file

Other functions in fs

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