Codec.safeParse

Parses an unknown value using a funtypes Codec without throwing an error.

For example:

import * as ft from "funtypes";
import * as s from 'funtypes-schemas';

export const UserCodec = ft.Object({
  id: ft.Number,
  name: ft.String,
  dateOfBirth: s.ParsedDateTimeString(),
});
// => ft.Codec<{ id: number; name: string; dateOfBirth: Date }>

// ✅ Validates and parses the Date
assert.deepEqual(
  UserCodec.safeParse({
    id: 1,
    name: "Forbes Lindesay",
    dateOfBirth: "1970-01-01T00:00:00.000Z",
  }),
  {
    success: true,
    value: {
      id: 1,
      name: "Forbes Lindesay",
      dateOfBirth: new Date("1970-01-01T00:00:00.000Z"),
    },
  },
);

// 🚨 Invalid: id should be a number, but here we've
//    passed a string instead.
const failedResult = UserCodec.safeParse({
  id: "42",
  name: "Forbes Lindesay",
  dateOfBirth: "1970-01-01T00:00:00.000Z"
});
assert.deepEqual(failedResult.success, false);
console.log(ft.showError(failedResult));
// => prints human readable error message

See the Result type for more information on how you can handle the unsuccessful return values from safeParse.