7 replies

Schema Decoding vs Class Constructor Validation in Effect-TS

When using a class constructor as a validator (https://github.com/Effect-TS/effect/blob/main/packages/schema/README.md#class-constructor-as-a-validator), what does Schema do under the hood in order to decode the input? In the example below, using

new Person()

new Person()

throws an error when the

name

name

property includes whitespace whereas calling

Schema.decodeUnknownSync

Schema.decodeUnknownSync

properly trims the whitespace as expected.

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

class Person extends Schema.Class<Person>('Person')({
  id: Schema.Number,
  name: Schema.Trim,
}) {}

const johnny = new Person({ id: 1, name: ' johnny ' }); // throws error
const john = Schema.decodeUnknownSync(Person)({ id: 1, name: ' john ' }); // does not throw 

console.log(johnny);
console.log(john);

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

class Person extends Schema.Class<Person>('Person')({
  id: Schema.Number,
  name: Schema.Trim,
}) {}

const johnny = new Person({ id: 1, name: ' johnny ' }); // throws error
const john = Schema.decodeUnknownSync(Person)({ id: 1, name: ' john ' }); // does not throw 

console.log(johnny);
console.log(john);

Effect Community•2y ago•

7 replies

erikshestopal

Schema Decoding vs Class Constructor Validation in Effect-TS

new Person()

new Person()

throws an error when the

name

name

property includes whitespace whereas calling

Schema.decodeUnknownSync

Schema.decodeUnknownSync

properly trims the whitespace as expected.

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

class Person extends Schema.Class<Person>('Person')({
  id: Schema.Number,
  name: Schema.Trim,
}) {}

const johnny = new Person({ id: 1, name: ' johnny ' }); // throws error
const john = Schema.decodeUnknownSync(Person)({ id: 1, name: ' john ' }); // does not throw 

console.log(johnny);
console.log(john);

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

class Person extends Schema.Class<Person>('Person')({
  id: Schema.Number,
  name: Schema.Trim,
}) {}

const johnny = new Person({ id: 1, name: ' johnny ' }); // throws error
const john = Schema.decodeUnknownSync(Person)({ id: 1, name: ' john ' }); // does not throw 

console.log(johnny);
console.log(john);

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