export function validateKey()

in packages/geofire-common/src/index.ts [45:64]

• 18 lines of code
• 7 McCabe index (conditional complexity)

export function validateKey(key: string): void {
  let error: string;

  if (typeof key !== 'string') {
    error = 'key must be a string';
  } else if (key.length === 0) {
    error = 'key cannot be the empty string';
  } else if (1 + GEOHASH_PRECISION + key.length > 755) {
    // Firebase can only stored child paths up to 768 characters
    // The child path for this key is at the least: 'i/<geohash>key'
    error = 'key is too long to be stored in Firebase';
  } else if (/[\[\].#$\/\u0000-\u001F\u007F]/.test(key)) {
    // Firebase does not allow node keys to contain the following characters
    error = 'key cannot contain any of the following characters: . # $ ] [ /';
  }

  if (typeof error !== 'undefined') {
    throw new Error('Invalid GeoFire key \'' + key + '\': ' + error);
  }
}