How to use the decoders.maybe function in decoders

To help you get started, we’ve selected a few decoders examples, based on popular ways it is used in public projects.

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github nvie / decoders / src / types / optional-tests.ts View on Github external
import { maybe, nullable, optional, string } from 'decoders';

optional(string); // $ExpectType Decoder
optional(optional(string)); // $ExpectType Decoder

nullable(string); // $ExpectType Decoder
nullable(nullable(string)); // $ExpectType Decoder

maybe(string); // $ExpectType Decoder
maybe(maybe(string)); // $ExpectType Decoder
github nvie / decoders / src / types / optional-tests.ts View on Github external
import { maybe, nullable, optional, string } from 'decoders';

optional(string); // $ExpectType Decoder
optional(optional(string)); // $ExpectType Decoder

nullable(string); // $ExpectType Decoder
nullable(nullable(string)); // $ExpectType Decoder

maybe(string); // $ExpectType Decoder
maybe(maybe(string)); // $ExpectType Decoder
github nvie / decoders / src / types / typescript-tests.ts View on Github external
switch (type) {
        case 'rect':
            return rect;
        case 'circle':
            return circle;
    }
    return fail('Must be a valid shape');
});

guard(
    object({
        a0: string,
        a1: number,
        a2: optional(nullable(either4(string, email, regex(/x/, 'Must be x'), url()))),
        a3: fail('foo'),
        a4: maybe(mixed),
        a5: either3(constant('foo'), constant('bar'), constant('qux')),
        a6: exact({ c: array(poja), d: pojo }),
        a7: tuple6(hardcoded('foo'), mixed, null_, undefined_, unknown, truthy),
        a8: tuple4(integer, number, positiveInteger, positiveNumber),
        a9: either(boolean, numericBoolean),
        b0: map(
            compose(
                string,
                predicate(s => s.startsWith('x'), 'Must start with x')
            ),
            s => s.toUpperCase()
        ),
        b1: shape,
        b2: date,
        b3: dict(string),
        b4: mapping(string),