Implement tests with uvu/swc

.changeset/fluffy-ladybugs-fry.md

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+---
+"microsite": patch
+---
+
+Remove prettier from core dependencies

.changeset/late-lions-leave.md

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+---
+"microsite": patch
+---
+
+Remove PostCSS logic from core dependencies. Microsite will prompt users to install PostCSS locally if detected.

.github/CONTRIBUTING.md

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+# Contributing to Microsite
+
+This codebase is a monorepo, set up with [Lerna](https://github.com/lerna/lerna). You should start by familiarizing yourself with `lerna`, as it operates a little bit differently than the standard Node/NPM workflow. 
+
+> Note: Commands should generally be run from the root directory of the monorepo rather than a subdirectory like `packages/microsite`.
+
+## Initial dev setup
+
+1. Install [Volta](https://volta.sh/) if you haven't already. It's our favorite tools for managing Node/NPM versions, and automatically picks up the correct Node version for this project.
+
+2. Install dependencies for the monorepo: `npm install`.
+
+3. Install and link dependencies in sub-packages: `npx lerna bootstrap`
+
+## Adding features/fixing bugs
+Please open an issue describing your feature/bug before opening a PR.
+
+Please ensure that your PR is covered by a test, if applicable. Microsite currently has very fews tests but this is something we hope to prioritize.
+
+## Testing
+
+Our tests are written in TypeScript with [`uvu`](https://github.com/lukeed/uvu). They are run with the `uvu` CLI and [`@swc-node/register`](https://github.com/Brooooooklyn/swc-node/tree/master/packages/register).
+
+> Note: as of `@swc-node/[email protected]`, `jsxFactory` and `jsxFragmentFactory` are not respected. This means any Preact components need to include the following comment at the top of the file:
+> `/* @jsx h */`
+> This should be fixed in the next version of `@swc-node/register`.
+
+```bash
+npm run test
+
+# Or watch mode (requires a file change to run the first time)
+npm run test:watch
+```
+
+**VSCode:** There are launch actions included for both single-run and watch mode.

.github/workflows/test.yml

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+name: Test
+
+on: push
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - uses: volta-cli/action@v1
+
+    - run: npm ci
+
+    - run: npm run bootstrap:ci
+
+    - run: npm run test

.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+      {
+          "name": "Run tests",
+          "request": "launch",
+          "console": "integratedTerminal",
+          "autoAttachChildProcesses": true,
+          "runtimeArgs": [
+              "run-script",
+              "test"
+          ],
+          "runtimeExecutable": "npm",
+          "skipFiles": [
+              "<node_internals>/**"
+          ],
+          "type": "pwa-node"
+      },
+      {
+          "name": "Watch tests",
+          "request": "launch",
+          "console": "integratedTerminal",
+          "autoAttachChildProcesses": true,
+          "runtimeArgs": [
+              "run-script",
+              "test:watch"
+          ],
+          "runtimeExecutable": "npm",
+          "skipFiles": [
+              "<node_internals>/**"
+          ],
+          "type": "pwa-node"
+      },
+  ]
+}