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Add documentation for the never type
#383
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DanielRosenwasser
suggested changes
Sep 20, 2016
| # Never | ||
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| The `never` type represents the type of values that never occur. | ||
| For instance, `never` is the return type for a function that always throws an exception or one that never returns; |
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Is that true? Do we infer that? Because I'm pretty sure we still infer void.
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well.. only for function expressions and lambda's. i should be more specific.
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| The `never` type represents the type of values that never occur. | ||
| For instance, `never` is the return type for a function that always throws an exception or one that never returns; | ||
| `never` is also the type of variables under type guards that are never true. |
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Variables also acquire the type never when narrowed by any type guards that can never be true.
| For instance, `never` is the return type for a function that always throws an exception or one that never returns; | ||
| `never` is also the type of variables under type guards that are never true. | ||
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| The `never` type is a subtype of and assignable to every type; however, no type is a subtype of or assignable to `never` (except `never` itself). |
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This includes the any type.
DanielRosenwasser
approved these changes
Sep 20, 2016
chicoxyzzy
reviewed
Sep 28, 2016
| # Never | ||
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| The `never` type represents the type of values that never occur. | ||
| For instance, `never` is the return type for a function expression or a arrow function expresssion that always throws an exception or one that never returns; |
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Fixes #313