How can I recursively read a directory in Deno? - file-io

Question

I'm trying to recursively read a file in Deno using Deno.readDir, but the example they provide only does the folder given:
for await (const entry of Deno.readDir(Deno.cwd())) {
console.log(entry.name);
}
How can I make this recursive?

Answer 1

Deno's standard library includes a function called walk for this purpose. It's available in std/fs/walk.ts. Here's an example:
/Users/deno/so-74953935/main.ts:
import { walk } from "https://deno.land/std#0.170.0/fs/walk.ts";
for await (const walkEntry of walk(Deno.cwd())) {
const type = walkEntry.isSymlink
? "symlink"
: walkEntry.isFile
? "file"
: "directory";
console.log(type, walkEntry.path);
}
Running in the terminal:
% pwd
/Users/deno/so-74953935
% ls -AF
.vscode/ deno.jsonc deno.lock main.ts
% ls -AF .vscode
settings.json
% deno --version
deno 1.29.1 (release, x86_64-apple-darwin)
v8 10.9.194.5
typescript 4.9.4
% deno run --allow-read main.ts
directory /Users/deno/so-74953935
file /Users/deno/so-74953935/main.ts
file /Users/deno/so-74953935/deno.jsonc
file /Users/deno/so-74953935/deno.lock
directory /Users/deno/so-74953935/.vscode
file /Users/deno/so-74953935/.vscode/settings.json

Answer 2

Since that function returns an async generator, you can make your own generator function that wraps around Deno.readDir:
(Do note that the example provided will join the path and name, giving you strings such as /directory/name.txt)
import { join } from "https://deno.land/std/path/mod.ts";
export async function* recursiveReaddir(
path: string
): AsyncGenerator<string, void> {
for await (const dirEntry of Deno.readDir(path)) {
if (dirEntry.isDirectory) {
yield* recursiveReaddir(join(path, dirEntry.name));
} else if (dirEntry.isFile) {
yield join(path, dirEntry.name);
}
}
}
for await (const entry of recursiveReaddir(Deno.cwd())) {
console.log(entry)
}
OR, you can use recursive_readdir, which is a 3rd party library in Deno made for this purpose.