Say I have a type that is inferred from something else like this:
const foo = { a: 1, b: 2 };
type FooType = typeof foo;
Is it possible to then use the keys in that type to enforce the keys in an interface? For example, I want this to pass in the TypeScript compiler:
interface OkInterface {
a: string; // the type should not matter
b: string;
}
But this should not:
interface NotOkInterface {
a: string;
c: string; // b is missing and an extra key 'c' is present
}
I am thinking of something like:
interface FooKeys implements {[key: keyof FooType]: any} {
...
}
Types are more flexible and the only way to handle your use case:
const foo = { a: 1, b: 2 }
type FooType = typeof foo
type EnforceFooInterface<T extends Record<keyof FooType, any>> = T
type OkInterface = EnforceFooInterface<{
a: string // the type should not matter
b: string
}>
type NotOkInterface = EnforceFooInterface<{
a: string
c: string // b is missing and an extra key 'c' is present
}>
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