eslint-plugin-big-number-rules

[shuckster]

I made an eslint plugin some time ago that's reached v2 and I thought it was now useful enough to share more broadly.

Essentially it offers replacements like:

from	to	plugin will also suggest
0.1 + 0.2	BigNumber.sum(0.1, 0.2)	('').concat(0.1, 0.2) and `${0.1}${0.2}` when you want string-concatenation instead of FP arithmetic
result === 0.3	BigNumber(result).isEqualTo(0.3)	Object.is(result, 0.3) when you want to strictly compare things that are not FP calculations
19.99 * 0.1	BigNumber(19.99).multipliedBy(0.1)
1 < 2	BigNumber(1).isLessThan(2)
2 >>> 4	BigNumber(2).shiftedBy(4)
4 << 2	BigNumber(4).shiftedBy(-2)
Math.min(1, 2)	BigNumber.minimum(1, 2)
Math.sign(-6)	BigNumber(-6).comparedTo(0)
(1).toFixed(2)	BigNumber(1).toFixed(2)
parseFloat('1.2')	BigNumber('1.2')
Number.parseFloat('2.1')	BigNumber('2.1')

There's configuration to enforce the rules only in files that import 'bignumber.js', along with other ways and means to mitigate the number of warnings if you introduce the plugin into a large code-base.

It's proved useful to me and I hope for others too.