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eyeccc/type-fail-demo.tsx

Created June 13, 2019 02:32
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type-fail-demo.tsx
const logEmail = (email: Email) => console.log(email);
logEmail("123");
/*
^^^^^^^^^^^^^^^
Argument of type '"123"' is not assignable to parameter of type 'string & { readonly Email: unique symbol; }'.
Type '"123"' is not assignable to type '{ readonly Email: unique symbol; }'.
*/
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