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When it comes to API responses you don't control, I recommend taking a look at user-defined type guards: https://basarat.gitbooks.io/typescript/content/docs/typ

• jjakque 7y ago
  > type guard Thanks for the link, I am currently doing something similar without knowing TS implicit behavior. With 1st given example in the link, I forced on a style to such: ``` function doSomething(x: number | string) { if (typeof x === 'string') { doSomethingForString(x) } // Never do catch all to assume all non-strings are numbers if (typeof x === 'number') { doSomethingForNumber(x) } // Per transpiler rule, you not meant to be here, so error throwing is appropriate throw new Error('Unexpected type') } function doSomethingForString(x: string) { // Code } function doSomethingForNumber(x: number) { // Code } ```