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Incorrect slice() from fs.openAsBlob() #53908

Description

@jleedev

Version

v22.5.0

Platform

Linux penguin 6.6.32-02873-ge0e03a627715 #1 SMP PREEMPT Mon, 1 Jul 2024 20:29:42 +0000 aarch64 GNU/Linux

Subsystem

No response

What steps will reproduce the bug?

> await fs.promises.writeFile('a.txt', 'abcdefghij')
> blob = await fs.openAsBlob('a.txt')
Blob { size: 10, type: '' }
> await _.text()
'abcdefghij'
> blob.slice(3)
Blob { size: 7, type: '' }
> await _.text()
'defghij'
> blob.slice(3).slice()
Blob { size: 7, type: '' }
> await _.text()
'defg'

How often does it reproduce? Is there a required condition?

No response

What is the expected behavior? Why is that the expected behavior?

slice() with no arguments should be equivalent to slice(0, length) and return the entire blob; both of those are incorrectly returning something else.

What do you see instead?

The returned Blob object purports to have the expected size, but when it is read it has the wrong length.

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    confirmed-bugIssues and PRs for confirmed bugs.fsIssues and PRs related to file-system APIs and the fs module.

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