List filenames recursively in a directory using this utility function.

In this article, we will review a function named listRecursively found in unbuild/src/utils.ts export function listRecursively(path: string): string[] { const filenames = new Set(); const walk = (path: string): void => { const files = readdirSync(path); for (const file of files) { const fullPath = resolve(path, file); if (statSync(fullPath).isDirectory()) { filenames.add(fullPath + "/"); walk(fullPath); } else { filenames.add(fullPath); } } }; walk(path); return [...filenames]; } This codesnippet does below: Initialise filenames to a Set const filenames = new Set(); Using a Set prevents duplicate file names, if you wish to include duplicate files names, you are better off using an array. I study large open-source projects and provide insights, give my repository a star. Define walk function with path parameter const walk = (path: string): void => { Get the list of files/directorites const files = readdirSync(path); readdirSync is an API used to read the contents of the directory. Read more about readdirSync. Loop through files and get full path for (const file of files) { const fullPath = resolve(path, file); Check if the path is a directory // statSync provides an API to check if the given path is a directory. if (statSync(fullPath).isDirectory()) { // Add the path to filenames set // filenames is a set and add is used add the fullPath filenames.add(fullPath + "/"); // Call walk function recursively walk(fullPath); } else { // filenames is a set and add is used add the fullPath filenames.add(fullPath); } Call the walk function. walk(path); Return the file names return [...filenames]; About me: Hey, my name is Ramu Narasinga. I study large open-source projects and create content about their codebase architecture and best practices, sharing it through articles, videos. I am open to work on interesting projects. Send me an email at ramu.narasinga@gmail.com My Github — https://github.com/ramu-narasinga My website — https://ramunarasinga.com My Youtube channel — https://www.youtube.com/@thinkthroo Learning platform — https://thinkthroo.com Codebase Architecture — https://app.thinkthroo.com/architecture Best practices — https://app.thinkthroo.com/best-practices Production-grade projects — https://app.thinkthroo.com/production-grade-projects References https://github.com/unjs/unbuild/blob/main/src/utils.ts#L54 https://nodejs.org/api/fs.html#fsreaddirsyncpath-options https://nodejs.org/api/fs.html#fsstatsyncpath-options

export function listRecursively(path: string): string[] {
  const filenames = new Set<string>();
  const walk = (path: string): void => {
    const files = readdirSync(path);
    for (const file of files) {
      const fullPath = resolve(path, file);
      if (statSync(fullPath).isDirectory()) {
        filenames.add(fullPath + "/");
        walk(fullPath);
      } else {
        filenames.add(fullPath);
      }
    }
  };
  walk(path);
  return [...filenames];
}

const filenames = new Set<string>();

const walk = (path: string): void => {

const files = readdirSync(path);

for (const file of files) {
      const fullPath = resolve(path, file);

// statSync provides an API to check if the given path is a directory.
if (statSync(fullPath).isDirectory()) {
  // Add the path to filenames set
  // filenames is a set and add is used add the fullPath
  filenames.add(fullPath + "/");
  // Call walk function recursively
  walk(fullPath);
} else {
  // filenames is a set and add is used add the fullPath
  filenames.add(fullPath);
}

 walk(path);

return [...filenames];

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