isNumber

WARNING

isNumber is a @gradii/nanofn type predicate, not a fedaco method. It appears in test fixtures because the e2e suite uses it for assertions on auto-incrementing primary keys.

What it does

import { isNumber } from '@gradii/nanofn';

isNumber(1);     // true
isNumber('1');   // false
isNumber(NaN);   // false (most implementations exclude NaN)
isNumber(null);  // false

Why it shows up in fedaco docs

The test:

const user = await User.createQuery().create({ email: 'ada@example.com' });
const fetched = await User.createQuery().first();

expect(isNumber(fetched.id)).toBe(true);

…asserts that fedaco coerces auto-increment primary keys to numbers (driver-dependent — mysql2 and pg return strings for BIGINT/BIGSERIAL by default; SQLite returns numbers).

Why You Probably Don't Need This

For application code, just compare or use the value directly:

const user = await User.createQuery().find(req.params.id);
const id = user.id;        // auto-cast based on _keyType

If you've configured _keyType = 'string' (UUIDs, slugs), id is a string. Otherwise it's a number.

For numeric assertions in your own tests, use typeof or Number.isFinite:

expect(typeof user.id).toBe('number');
expect(Number.isFinite(user.id)).toBe(true);

See Also

• @gradii/nanofn docs
• getAttribute — the underlying read.
• Model _keyType — controls whether the primary key is treated as 'int' or 'string'.