fix: prepend basePath to static file URLs (#1213)

* fix: prepend basePath to static file URLs

* chore: add basePath demo

* chore: log event

* fix: pass basePath

* chore: remove cypress from basepath demo for now

* chore: copy default locale

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: ascorbic

demos/base-path/.eslintrc

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+{
+  "extends": "next",
+  "root": true
+}

demos/base-path/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# vercel
+.vercel

demos/base-path/README.md

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+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `pages/index.js`. The page auto-updates as you edit the file.
+
+[API routes](https://nextjs.org/docs/api-routes/introduction) can be accessed on [http://localhost:3000/api/hello](http://localhost:3000/api/hello). This endpoint can be edited in `pages/api/hello.js`.
+
+The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

demos/base-path/local-plugin/index.js

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+module.exports = require('../../../lib')

demos/base-path/local-plugin/manifest.yml

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+name: '@netlify/plugin-nextjs-local'

demos/base-path/local-plugin/package-lock.json

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+{
+  "name": "local-plugin",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "preinstall": "cd ../../.. && npm i"
+  },
+  "author": "",
+  "license": "ISC"
+}

demos/base-path/local-plugin/package.json

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+[build]
+command = "next build"
+publish = ".next"
+ignore = "git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF ../../"
+
+[build.environment]
+# cache Cypress binary in local "node_modules" folder
+# so Netlify caches it
+CYPRESS_CACHE_FOLDER = "../node_modules/.CypressBinary"
+
+[dev]
+framework = "#static"
+
+[[plugins]]
+package = "./local-plugin"
+
+[[plugins]]
+package = "@netlify/plugin-local-install-core"
+
+# [[context.deploy-preview.plugins]]
+# package = "netlify-plugin-cypress"

demos/base-path/netlify.toml

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+module.exports = {
+  // Configurable site features we support:
+  // distDir: 'build',
+  generateBuildId: () => 'build-id',
+  i18n: {
+    defaultLocale: 'en',
+    locales: ['en', 'es', 'fr'],
+  },
+  async headers() {
+    return [
+      {
+        source: '/',
+        headers: [
+          {
+            key: 'x-custom-header',
+            value: 'my custom header value',
+          },
+        ],
+      },
+    ]
+  },
+  trailingSlash: true,
+  // Configurable site features _to_ support:
+  basePath: '/docs',
+  // Rewrites allow you to map an incoming request path to a different destination path.
+  async rewrites() {
+    return {
+      beforeFiles: [
+        {
+          source: '/old/:path*',
+          destination: '/:path*',
+        },
+      ],
+    }
+  },
+  // Redirects allow you to redirect an incoming request path to a different destination path.
+  async redirects() {
+    return [
+      {
+        source: '/redirectme',
+        destination: '/',
+        permanent: true,
+      },
+    ]
+  },
+}

demos/base-path/next.config.js

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+import '../styles/globals.css'
+
+function MyApp({ Component, pageProps }) {
+  return <Component {...pageProps} />
+}
+
+export default MyApp