Type Alias StrictCIDR

The strict CIDR validation mode checks whether the input string is a genuinely valid CIDR, ruling out unmatching prefixes. For example, the (potential) CIDR 192.168.0.1/24 is inaccurate in that the prefix 192.168.0.1 should instead be 192.168.0.0 for the bit length of 24.

Without the validation mode on, IPUtil.isIP('192.168.0.1/24', true) still returns true. But with it on, the relevant method will return a corrected CIDR as a string instead of a boolean if the input string is potentially valid as a CIDR but is inaccurate:

// allowCidr: false or undefined
console.log(IPUtil.isIP('192.168.0.1')); // true
console.log(IPUtil.isIP('192.168.0.1/24')); // false
// allowCidr: true
console.log(IPUtil.isIP('192.168.0.1', true)); // true
console.log(IPUtil.isIP('192.168.0.1/24', true)); // true
console.log(IPUtil.isIP('192.168.0.0/24', true)); // true
// allowCidr: 'strict'
console.log(IPUtil.isIP('192.168.0.1', 'strict')); // true (just as when allowCidr is true)
console.log(IPUtil.isIP('192.168.0.1/24', 'strict')); // 192.168.0.0/24
console.log(IPUtil.isIP('192.168.0.0/24', 'strict')); // true
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