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TypeScript
1234567891011121314151617181920212223242526272829303132// SPDX-License-Identifier: AGPL-3.0-or-later
const ASCII_UPPER_A = 65;const ASCII_UPPER_Z = 90;const REGION_CODE_LENGTH = 2;
function isAsciiUpperAlpha2(value: string): boolean { return ( value.length === REGION_CODE_LENGTH && value.charCodeAt(0) >= ASCII_UPPER_A && value.charCodeAt(0) <= ASCII_UPPER_Z && value.charCodeAt(1) >= ASCII_UPPER_A && value.charCodeAt(1) <= ASCII_UPPER_Z );}
export function normalizeRegionCode(regionCode: string): string | undefined { const trimmedRegionCode = regionCode.trim(); if (trimmedRegionCode.length !== REGION_CODE_LENGTH) { return undefined; } const upperRegionCode = trimmedRegionCode.toUpperCase(); if (!isAsciiUpperAlpha2(upperRegionCode)) { return undefined; } return upperRegionCode;}
export function isRegionCode(value: string): boolean { return normalizeRegionCode(value) !== undefined;}