Add `getViteConfig` helper (#4154)

* feat: add astro/compat entrypoint for vitest

* chore: add with-vitest example

* chore: add vitest as optional peer dependency

* chore: update lockfile

* refactor: remove astro/compat, use astro/config

* feat: allow arbitrary modes for `create-vite`

* feat: pass vite mode and command when using `getViteConfig`

* chore: remove vitest from peer deps

* chore: add changeset

* chore: update lockfile

Co-authored-by: Nate Moore <nate@astro.build>

1 files changed, 21 insertions, 0 deletions

diff --git a/examples/with-vitest/test/basic.test.ts b/examples/with-vitest/test/basic.test.ts
new file mode 100644
index 000000000..0f6d96168
--- /dev/null
+++ b/examples/with-vitest/test/basic.test.ts
@@ -0,0 +1,21 @@
+import { assert, expect, test } from 'vitest'
+
+// Edit an assertion and save to see HMR in action
+
+test('Math.sqrt()', () => {
+  expect(Math.sqrt(4)).toBe(2)
+  expect(Math.sqrt(144)).toBe(12)
+  expect(Math.sqrt(2)).toBe(Math.SQRT2)
+})
+
+test('JSON', () => {
+  const input = {
+    foo: 'hello',
+    bar: 'world',
+  }
+
+  const output = JSON.stringify(input)
+
+  expect(output).eq('{"foo":"hello","bar":"world"}')
+  assert.deepEqual(JSON.parse(output), input, 'matches original')
+})