All files / lib/whatsapp phone-variants.ts

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/**
 * Every spelling an Indian number is stored under. Pros and inquiries hold
 * E.164 (`+91…`) or bare ten digits; Meta delivers `from` as `91…` with no
 * plus; Quick Send stores whatever was typed. Anything that is not a
 * recognisable Indian number is returned as-is, so a foreign number can never
 * match a pro by its last ten digits.
 */
export function whatsappNumberVariants(phone: string): string[] {
	const digits = phone.replace(/\D/g, "");
	const national =
		digits.length === 10
			? digits
			: digits.length === 12 && digits.startsWith("91")
				? digits.slice(2)
				: null;
	return national ? [national, `91${national}`, `+91${national}`] : [phone];
}