12 replies

Extracting Schema Instance from Property Signature

Is there any way to get a

Schema

Schema

instance from a property signature? For example:

import { Schema as S } from '@effect/schema';

const Person = S.Struct({
  name: S.String,
  role: S.optional(S.Literal('a', 'b')),
});

const Role = Person.fields.role;

console.log(S.decodeSync(Role)('a')); // Error

import { Schema as S } from '@effect/schema';

const Person = S.Struct({
  name: S.String,
  role: S.optional(S.Literal('a', 'b')),
});

const Role = Person.fields.role;

console.log(S.decodeSync(Role)('a')); // Error

What I'd like to do is to get access to the

S.Literal('a', 'b')

S.Literal('a', 'b')

within the

S.optional

S.optional

. Obviously it would be better here if the inner expression was factored out to its own schema to begin with, but a lot of times when working with existing schema definitions that's not feasible.

Effect Community•2y ago•

12 replies

mkrause

Extracting Schema Instance from Property Signature

Is there any way to get a

Schema

Schema

instance from a property signature? For example:

import { Schema as S } from '@effect/schema';

const Person = S.Struct({
  name: S.String,
  role: S.optional(S.Literal('a', 'b')),
});

const Role = Person.fields.role;

console.log(S.decodeSync(Role)('a')); // Error

import { Schema as S } from '@effect/schema';

const Person = S.Struct({
  name: S.String,
  role: S.optional(S.Literal('a', 'b')),
});

const Role = Person.fields.role;

console.log(S.decodeSync(Role)('a')); // Error

What I'd like to do is to get access to the

S.Literal('a', 'b')

S.Literal('a', 'b')

within the

S.optional

S.optional

. Obviously it would be better here if the inner expression was factored out to its own schema to begin with, but a lot of times when working with existing schema definitions that's not feasible.

Extracting Schema Instance from Property Signature

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