feat(underscore-redirects): add support for force (#11271)

Co-authored-by: Bjorn Lu <bjornlu.dev@gmail.com>

.changeset/funny-cats-sell.md

@@ -0,0 +1,16 @@
+---
+'@astrojs/underscore-redirects': patch
+---
+
+Adds support for forced redirects
+
+Redirects can be forced by setting `force` to `true`:
+
+```ts
+redirects.add({
+    // ...
+    force: true
+})
+```
+
+It will append a `!` after the status.

packages/underscore-redirects/src/print.ts

@@ -29,7 +29,8 @@ export function print(
 			' '.repeat(inputSpaces) +
 			definition.target +
 			' '.repeat(Math.abs(targetSpaces)) +
-			definition.status;
+			definition.status +
+			(definition.force ? '!' : '');
 	}
 
 	return _redirects;

packages/underscore-redirects/src/redirects.ts

@@ -9,6 +9,7 @@ export type RedirectDefinition = {
 	// a priority once inserted.
 	weight: number;
 	status: number;
+	force?: number;
 };
 
 export class Redirects {

packages/underscore-redirects/test/print.test.js

@@ -47,4 +47,21 @@ describe('Printing', () => {
 		const expectedParts = ['/pets/:cat', '/pets/:cat/index.html', '200'];
 		assert.deepEqual(parts, expectedParts);
 	});
+
+	it('Properly handles force redirects', () => {
+				const _redirects = new Redirects();
+		_redirects.add({
+			dynamic: false,
+			input: '/a',
+			target: '/b',
+			status: 200,
+			weight: 1,
+			force: true
+		});
+		let out = _redirects.print();
+		let parts = out.split(/\s+/);
+
+		const expectedParts = ['/a', '/b', '200!'];
+		assert.deepEqual(parts, expectedParts);
+	})
 });