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node:sqlite: backup() unwraps any object as a DatabaseSync, and a duck-typed URL aborts the process

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
68/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
javascript, node.js, sqlite
Domain
databases

Research direction

Start with the node:sqlite implementations of backup() and the DatabaseSync constructor, then reproduce both examples from the issue. The work is done when invalid backup arguments and malformed URL-like objects raise TypeError instead of causing a segfault, with regression coverage for both cases.

Written by the indexing model from the issue text.

Description

Version

v27.0.0-pre (884f9cd62da)

Platform
Darwin 25.6.0 arm64
Subsystem

sqlite

What steps will reproduce the bug?

node:sqlite's backup() checks that its first argument is an object, then unwraps it. Passing anything other than a DatabaseSync results in a crash:

const { backup } = require('node:sqlite');
backup({}, '/tmp/c1a.db');

Similarly, the DatabaseSync constructor treats any object as a URL if it has a string href. If that href doesn't parse, it crashes:

const { DatabaseSync } = require('node:sqlite');
new DatabaseSync({ href: 'zzz' });
How often does it reproduce? Is there a required condition?

It's consistent.

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

Both should raise a TypeError.

What do you see instead?

A segfault.

Additional information

No response

Dominant language
JavaScript
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Forks
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Avg merge
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Merged PRs (30d)
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