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I'm having some trouble finding your proposal in the thread... how would you do it?

• jwalton 5y ago
  :) Fair enough: function isHuman(obj: unknown): obj is Human { return !!obj && typeof obj === 'object' && typeof (obj as any).name === 'string' && typeof (obj as any).age === 'number'; } This checks the shape of the object, and returns true if it's a `Human`. This will work for array or objects or classes or anything.