typed-routes

typed-routes

Routes with TypeScript support.

This library is intended solely to help with pattern matching path-like strings. It makes no assumptions about location or browser history or any attempt to implement actual route change detection.

Usage

import createRoute from "typed-routes";

// Like "/data/profiles/:userId/info" in Express
let path = createRoute()
  .extend("data", "profiles")
  .param("userId")
  .extend("info");

Typed routes can be matched against strings to return the extracted params (if there's match) or to convert a params object to a param string

path.match("/data/profiles/xyz/info"); // => { userId: "xyz" }
path.match("/daat/profylez/xyz/info"); // => undefined

Typed routes can also convert a set of params to a string route.

path.from({ userId: "xyz" }); // => "/data/profiles/xyz/info"
path.from({ uzerid: "xyz" }); // => Type error

Routes may have optional types and rest types as well

let path = createRoute().param("groupId").opt("userId").rest();
path.match("/gid/uid/a/b/c");
  // => { groupId: "gid", userId: "uid", rest: ["a", "b", "c"] }
path.match("/gid");
  // => { groupId: "gid", rest: [] }

Routes can specify types.

import { default as createRoute, IntType } from "typed-routes";

let path = createRoute().extend("profile").param("uid", IntType);
path.match("/profile/123"); // => { uid: 123 }
path.match("/profile/abc"); // => undefined

path.from({ uid: 123 });   // => "/profile/123"
path.from({ uid: "abc" }); // => Type error

Types are just an object with parse and stringify functions. For example, this is the definition of the DateTimeParam type, which converts a Date to milliseconds since epoch.

const DateTimeParam = {
  parse: (s: string): Date|undefined => {
    let ret = new Date(parseInt(s));
    return isNaN(ret.getTime()) ? undefined : ret;
  },
  stringify: (d: Date): string => d.getTime().toString()
};

You can provide your own types for more customized behavior (such as returning a default value is one is undefined).

API

createRoute

createRoute({
  // What kind of "slash" separates paths? Defaults to "/".
  delimiter: string;

  // Require that our route starts with a certain prefix. Defaults to "/".
  prefix: string;

  // Require that our route ends with a certain suffix. Defaults to
  // empty string.
  suffix: string;
}): Route;

Creates a route object with certain settings.

Route.extend

route.extend(...parts: string[]): Route;

Adds static segments to route that must match exactly.

Route.param

route.param(name: string, type: ParamType = StringParam): Route;

Add a required parameter and optional type.

Route.opt

route.opt(name: string, type: ParamType = StringParam): OptRoute;

Add an optional parameter and type. .extend and .param cannot follow a .opt command.

Route.rest

route.rest(type = StringParam): Route;
route.rest(name = "rest", type = StringParam): Route;

Add a field that captures multiple parts of the path as an array. Defaults to using rest as the property but this can be changed. Type specifies what kind of array we're working with (e.g. use IntParam or FloatParam to type as number[]).

Built-In Param Types

• StrParam - Default parameter. Types as string.

• IntParam - Type as integer using parseInt.

• FloatParam - Type as float using parseFloat.

• DateTimeParam - Type as Date by serializing as milliseconds since epoch.

• ArrayParam(ParamType, delimiter = ",") - A function that takes another param type and returns as param type that parses as an array of the original type. For instance, ArrayParam(IntParam, "::") will parse 1::2::3 as [1, 2, 3].