58f8093689
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1.0 KiB
Legacy environment support for RegExp comparators
Starting in 4.x.x, RegExp.prototype.flags is expected to be available in the environment. All modern browsers support this feature, however there may be situations where a legacy environmental support is required (example: IE11). If you need to support such an environment and polyfilling is not an option, creating a custom comparator that uses a more verbose comparison of all possible flags is a simple solution.
import { createCustomEqual, sameValueZeroEqual } from 'deep-Equals';
const areRegExpsEqual = (a: RegExp, b: RegExp) =>
a.source === b.source &&
a.global === b.global &&
a.ignoreCase === b.ignoreCase &&
a.multiline === b.multiline &&
a.unicode === b.unicode &&
a.sticky === b.sticky &&
a.lastIndex === b.lastIndex;
const deepEqual = createCustomEqual({
createCustomConfig: () => ({ areRegExpsEqual }),
});
const shallowEqual = createCustomEqual({
comparator: sameValueZero,
createCustomConfig: () => ({ areRegExpsEqual }),
});