External module "node_modules/assert-never/index"

assertNever

• assertNever(value: never, noThrow?: undefined | false | true): never

• Helper function for exhaustive checks of discriminated unions. https://basarat.gitbooks.io/typescript/docs/types/discriminated-unions.html

  example

  type A = {type: 'a'}; type B = {type: 'b'}; type Union = A | B;

  function doSomething(arg: Union) { if (arg.type === 'a') { return something; }

   if (arg.type === 'b') {
     return somethingElse;
   }
  
   // TS will error if there are other types in the union
   // Will throw an Error when called at runtime.
   // Use `assertNever(arg, true)` instead to fail silently.
   return assertNever(arg);

  }

  Parameters

  • value: never

  • Optional noThrow: undefined | false | true

  Returns never