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/** Find the longest common character prefix between two strings. */
export function commonPrefix(a: string, b: string) {
const ac = Array.from(a)
const bc = Array.from(b)
let i = 0
while (i < ac.length && i < bc.length && ac[i] === bc[i]) i++
return {
prefix: ac.slice(0, i).join(""),
aSuffix: ac.slice(i).join(""),
bSuffix: bc.slice(i).join(""),
}
}
export function list<T>(value: T[] | undefined | null, fallback: T[]): T[] {
if (Array.isArray(value)) return value
return fallback
}
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