BunFile.slice() ignoring end parameter on macOS

[tryggvil]

What version of Bun is running?

1.0.23+83f2432da

What platform is your computer?

macOS

What steps can reproduce the bug?

BunFile.slice does not handle end parameter correctly, on macOS.

const contents = "1234567890abcdefghijklmnokprstuvxyz"
const sliceEndSmallerThanFile = 11

const blb = new Blob([contents]);
const blbSlice = blb.slice(2, sliceEndSmallerThanFile);
const blActualContents = await blbSlice.text();
console.log("blob actualContents:", blActualContents);

await Bun.write("contents.txt", contents);

const fil = Bun.file("contents.txt");
const filSlice = fil.slice(2, sliceEndSmallerThanFile);
const filActualContents = await filSlice.text();
console.log("file actualContents:", filActualContents);

on macOS the output is:

blob actualContents: 34567890a
file actualContents: 34567890abcdefghijklmnokprstuvxyz

returning the whole file contents instead of the slice

What is the expected behavior?

blob actualContents: 34567890a
file actualContents: 34567890a

What do you see instead?

blob actualContents: 34567890a
file actualContents: 34567890abcdefghijklmnokprstuvxyz

Additional information

No response

[truongan07]

• Get text of file before slice it ?

const contents = "1234567890abcdefghijklmnokprstuvxyz"
const sliceEndSmallerThanFile = 11

const blb = new Blob([contents]);
const blbSlice = blb.slice(2, sliceEndSmallerThanFile);
const blActualContents = await blbSlice.text();
console.log("blob actualContents:", blActualContents);

await Bun.write("contents.txt", contents);

const fil = Bun.file("contents.txt");
const filActualContents = await fil.text();
const filSlice = filActualContents.slice(2, sliceEndSmallerThanFile);

console.log("file actualContents:", filSlice);

[tryggvil]

• Get text of file before slice it ?

const contents = "1234567890abcdefghijklmnokprstuvxyz"
const sliceEndSmallerThanFile = 11

const blb = new Blob([contents]);
const blbSlice = blb.slice(2, sliceEndSmallerThanFile);
const blActualContents = await blbSlice.text();
console.log("blob actualContents:", blActualContents);

await Bun.write("contents.txt", contents);

const fil = Bun.file("contents.txt");
const filActualContents = await fil.text();
const filSlice = filActualContents.slice(2, sliceEndSmallerThanFile);

console.log("file actualContents:", filSlice);

Yes that is a workaround but this is a regression. BunFile.slice() used to work correctly in previous bun versions.

[jdalton]

Related:
#5980
#6252
#5186

@tryggvil do you know which version of Bun it worked in?
Of interest #6259

[Jakisundays]

i have the same problem but with audio files.

[tryggvil]

@jdalton Just got around to verify this but this works correctly last in version 1.0.15 , so this broke in version 1.0.16 of Bun. Btw. this is still not working correctly in bun 1.0.31.

[gyf304]

still not working correctly in 1.1.17