Reduce duplication.

source/redirect/base.ts

@@ -2,8 +2,21 @@ import {HostnameParameters} from './hostname.js';
 
 export type RedirectParameters = HostnameParameters;
 
+export type Matcher = {
+  matchType: 'hostname';
+  toMatch: string;
+};
+
 export abstract class Redirect<P extends RedirectParameters> {
-  constructor(public parameters: P) {}
+  constructor(public parameters: P & Matcher) {}
+
+  public isMatch(url: URL): boolean {
+    if (this.parameters.matchType === 'hostname') {
+      return url.hostname === this.parameters.toMatch;
+    }
+
+    return false;
+  }
 
   public abstract redirect(url: URL | string): URL;
 }

source/redirect/exports.ts

@@ -1,4 +1,3 @@
-import {RedirectParameters} from './base.js';
 import {HostnameRedirect} from './hostname.js';
 
 export * from './base.js';
@@ -6,7 +5,7 @@ export * from './hostname.js';
 
 export type Redirects = HostnameRedirect;
 
-export function parseRedirect<P extends RedirectParameters>(
+export function parseRedirect<P extends Redirects['parameters']>(
   parameters: P,
 ): Redirects | undefined {
   if (parameters.type === 'hostname') {

tests/redirect.test.ts

@@ -6,18 +6,23 @@ import {
   parseRedirect,
   HostnameRedirect,
   Redirect,
+  Redirects,
   RedirectParameters,
 } from '../source/redirect/exports.js';
 
+const hostnameParameters: HostnameRedirect['parameters'] = {
+  hostname: 'example.org',
+  matchType: 'hostname',
+  toMatch: 'example.com',
+  type: 'hostname',
+};
+
 test('parseRedirect', (t) => {
-  const samples: RedirectParameters[] = [
+  const samples: Array<Redirects['parameters']> = [
     {
       test: 'Invalid parameters',
-    } as unknown as RedirectParameters,
-    {
-      hostname: 'example.org',
-      type: 'hostname',
-    },
+    } as unknown as Redirects['parameters'],
+    hostnameParameters,
   ];
 
   for (const sample of samples) {
@@ -32,10 +37,7 @@ test('parseRedirect', (t) => {
 });
 
 test('Redirect.redirect', (t) => {
-  const hostnameRedirect = new HostnameRedirect({
-    hostname: 'example.org',
-    type: 'hostname',
-  });
+  const hostnameRedirect = new HostnameRedirect(hostnameParameters);
 
   const samples: Array<[string, Redirect<RedirectParameters>]> = [
     ['https://example.com', hostnameRedirect],
@@ -52,3 +54,29 @@ test('Redirect.redirect', (t) => {
     );
   }
 });
+
+test('Redirect.isMatch', (t) => {
+  type UrlSamples = Array<[string, boolean]>;
+
+  const hostnameRedirect = new HostnameRedirect(hostnameParameters);
+  const hostnameSamples: UrlSamples = [
+    ['https://example.com', true],
+    ['https://www.example.com', false],
+    ['https://example.org', false],
+  ];
+
+  const invalidRedirect = new HostnameRedirect({
+    test: 'invalid',
+  } as unknown as Redirects['parameters']);
+
+  const samples: Array<[Redirects, UrlSamples]> = [
+    [invalidRedirect, [['https://example.org', false]]],
+    [hostnameRedirect, hostnameSamples],
+  ];
+
+  for (const [redirect, urlSamples] of samples) {
+    for (const [sample, expected] of urlSamples) {
+      t.is(redirect.isMatch(new URL(sample)), expected);
+    }
+  }
+});

tests/snapshots/tests/redirect.test.ts.md

@@ -11,6 +11,8 @@ Generated by [AVA](https://avajs.dev).
     HostnameRedirect {
       parameters: {
         hostname: 'example.org',
+        matchType: 'hostname',
+        toMatch: 'example.com',
         type: 'hostname',
       },
     }