All files symbolMetadata.ts

100% Statements 6/6

100% Branches 2/2

100% Functions 1/1

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  type SymbolConstructorWithMetadata = SymbolConstructor & {
  metadata?: symbol;
};
 
export function ensureSymbolMetadata(): symbol {
  const symbolConstructor = Symbol as SymbolConstructorWithMetadata;
 
  if (symbolConstructor.metadata === undefined) {
    Object.defineProperty(symbolConstructor, 'metadata', {
      configurable: false,
      enumerable: false,
      writable: false,
      value: Symbol('Symbol.metadata'),
    });
  }
 
  return symbolConstructor.metadata;
}
 
export const symbolMetadata = ensureSymbolMetadata();