23 lines
644 B
TypeScript
23 lines
644 B
TypeScript
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// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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/**
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* Returns `true` if the input looks like a valid E164, and `false` otherwise. Note that
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* this may return false positives, as it is a fairly naïve check.
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*
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* See <https://www.twilio.com/docs/glossary/what-e164#regex-matching-for-e164> and
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* <https://stackoverflow.com/a/23299989>.
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*/
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export function isValidE164(
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value: unknown,
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mustStartWithPlus: boolean
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): value is string {
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if (typeof value !== 'string') {
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return false;
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}
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const regex = mustStartWithPlus ? /^\+[1-9]\d{1,14}$/ : /^\+?[1-9]\d{1,14}$/;
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return regex.test(value);
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}
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