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This recipe transforms the usage of fs.truncate() to fs.ftruncate() when a file descriptor is used instead of a file path.

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Deprecation

Node.js deprecated using fs.truncate() with a file descriptor argument. Use fs.ftruncate() instead when working with file descriptors. See DEP0081 for more details.

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Usage

Run this codemod with: 
npx codemod nodejs/fs-truncate-fd-deprecation

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Before/After

- const { truncate, open, close } = require('node:fs');
+ const { ftruncate, open, close } = require('node:fs');

  open('file.txt', 'w', (err, fd) => {
    if (err) throw err;
-   truncate(fd, 10, (err) => {
+   ftruncate(fd, 10, (err) => {
      if (err) throw err;
      close(fd, () => {});
    });
  });

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What It Does

  • Replaces truncate with ftruncate when imported from node:fs or fs
  • Updates function calls from truncate(fd, ...) to ftruncate(fd, ...)
  • Applies to callback, synchronous, and promise-based APIs
This codemod only updates cases where a file descriptor is passed. If you’re using fs.truncate() with a file path string, no changes will be made.
When working with file descriptors, always use the f-prefixed variants of file system methods: ftruncate(), fchmod(), fstat(), etc.

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