Package Exports

variant-ts
variant-ts/dist/index.js

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Readme

Variant-ts

Variant, Option and Result types for Typescript

Variants

import { Variant, variant, pattern } from "variant-ts";
import { match } form "ts-pattern";

type Connection = Variant<"IPV4", string> | Variant<"IPV6", string>;

let connection = variant<Connection>();

let con1 = connection("IPV4", "127.0.0.1");

let con2 = connection("IPV6", "2001:0db8:85a3:08d3:1319:8a2e:0370:7344");

match(con2)
    .with(pattern("IPV4"), res => {connect_ipv4(res.value)})
    .with(pattern("IPV6"), res => {connect_ipv6(res.value)})
    .exhaustive()

Options

import { none, some } from "variant-ts";

const one = some("foo");
const two = none();

const three = one.map((x) => x.concat("bar"));
const four = two.map((x) => x.concat("bar"));

expect(three.value).to.equal("foobar");
expect(four.value).to.equal(undefined);

Results

import { err, ok } from "variant-ts";

const one = ok("foo");
const two = err("error");

const three = one.map((x) => x.concat("bar"));
const four = two.map((x) => x.concat("bar"));

expect(three.value).to.equal("foobar");
expect(four.value).to.equal("error");