Nerdy Workaround:

As I could not find a javascript / typescript based workaround yet, I trigger a shell script after fs/copy with something like:

text=$1
echo $text
echo "${text@E}"

replacing the Octal UTF-8 bytes 303 266 by ö :)

ooh lemme at this one those utf8 characters won't even know what hit em

@michael-spengler its ya boy, @cakekindel, comin' back at ya with some need for more information - i'm unable to reproduce this, could you provide the code / shell snippet you're using to trigger the bug, and OS / deno version you're using?

I've written a test to cover this that is (maybe errantly?) passing currently, so I'm thinking it's time to gather more info

  async function copyFileWithUnicodeInName(): Promise<void> {
    const tmpDir = Deno.makeTempDirSync();
    const destDir = Deno.makeTempDirSync({ dir: tmpDir, suffix: 'dest' });

    const filename = "wow! ö.txt";
    const fromPath = `${tmpDir}/${filename}`;
    writeFileString(fromPath, "I have a naughty name!");

    const toPath = `${destDir}/${filename}`;

    await Deno.copyFile(fromPath, toPath);
    const copiedFile = Array.from(Deno.readDirSync(destDir))[0];

    try {
      assertEquals(copiedFile.name, filename);
    } finally {
      Deno.removeSync(tmpDir, { recursive: true });
    }
  },