Nested structure without index signature is not assignable to Jsonifiable
Consider this simple nested data structure:
interface Inner {
foo: string
}
interface Outer {
bar: Inner
}A value of type Outer can be losslessly converted to and from JSON. However, assigning it to a variable of type Jsonifiable won’t compile with TS 5.5.2 and [email protected] Playground link:
declare const outer: Outer
let jsonifiable: Jsonifiable = outer
// ^ Type 'Outer' is not assignable to type 'Jsonifiable'.
// Type 'Outer' is not assignable to type '{ [x: string]: Jsonifiable | undefined; }'.
// Index signature for type 'string' is missing in type 'Outer'.(2322)I believe the assignment should be valid.
sindresorhus / type-fest
A collection of essential TypeScript types
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