css-module-type-definitions/src/validateToken.ts

Generate Type Definitions for CSS Modules

const RESERVED_WORDS = new Set([
    'break',
    'case',
    'catch',
    'class',
    'const',
    'continue',
    'debugger',
    'default',
    'delete',
    'do',
    'else',
    'enum',
    'export',
    'extends',
    'false',
    'finally',
    'for',
    'function',
    'if',
    'import',
    'in',
    'instanceof',
    'new',
    'null',
    'return',
    'super',
    'switch',
    'this',
    'throw',
    'true',
    'try',
    'typeof',
    'var',
    'void',
    'while',
    'with',
    'as',
    'implements',
    'interface',
    'type',
    'let',
    'package',
    'private',
    'protected',
    'public',
    'static',
    'yield',
]);

export type Validation = { isValid: true } | { isValid: false; message: string };
export function validateToken(token: string): Validation {
    if(!/^[a-zA-Z$_][0-9a-zA-Z$_]*$/u.test(token))
        return { isValid: false, message: `${token} is not valid TypeScript variable name.` };

    if(RESERVED_WORDS.has(token))
        return { isValid: false, message: `${token} is TypeScript reserved word.` };

    return { isValid: true };
}

export default validateToken;