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Last active October 28, 2019 09:26
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README.md

How to make Union Types from Objects

const FilterA = Object.freeze({
  ALL: 'ALL',
  COMPLETED: 'COMPLETED',
  UNCOMPLETED: 'UNCOMPLETED'
});

type FilterTypeA = $Values<typeof FilterA>;


let a: FilterTypeA = FilterA.ALL; //OK
a = 'COMPLETED'; //OK
a = 'foo' // Error
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