4

I have json file test.json

{ "foo": "bar0" }

Given those types declaration


type Bar = 'bar0' | 'bar1'

interface Foo {
    foo: Bar
}

I tried to load this json

import test from './test.json'

const foo: Foo = test

And I got this error 

Type '{ "foo": string; }' is not assignable to type 'Foo'.
  Types of property 'foo' are incompatible.
    Type 'string' is not assignable to type 'Bar'.

I also tried with enum

enum Bar {
    bar0 = 'bar0',
    bar1 =  'bar1'
}

Of course it works with type Bar = string

Any idea about what can be wrong?

Improve this question
6
  • Possible duplicate of TypeScript type inference issue with string literal Commented Oct 30, 2019 at 13:54
  • 2
    I am trying to load JSON, it's quite different Commented Oct 30, 2019 at 14:07
  • TypeScript is inferring your JSON property foo is a string, while your type Bar is a string literal. It's the same problem but just different ways of getting it. Commented Oct 30, 2019 at 14:17
  • You need first of all do JSON.parse, and second you need to do as Foo. Commented Oct 30, 2019 at 14:21
  • @Bauke The solution suggests to cast the "center" object as 'as "center"' while I do not see how I could cast it. Are suggesting that I could use a temporary object Commented Oct 30, 2019 at 15:56
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