Module assert

assert

• assert(condition: any, msg?: string): asserts condition

• Simple runtime assertion that narrows involved types using assertion functions.

  Note: This function is not purely type level and leaves minimal runtime trace in generated code.

  example

  const something: string | undefined = "abc" as any; assert(something, "Something has to be defined!"); // from now on something is string, if this wouldn't be a case, assert would throw

  const anything = "abc" as any; assert(anything instanceof String, "anything has to be a string!"); // from now on anything is string

  Parameters

  • condition: any

  • msg: string = 'no additional info provided'

  Returns asserts condition