fix: prepend basePath to static file URLs

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.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/netlify.toml

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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/next.config.js

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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/pages/_app.js

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

demos/base-path/pages/another.js

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+import Head from 'next/head'
+import { useRouter } from 'next/router'
+import styles from '../styles/Home.module.css'
+
+export default function Home() {
+  const { locale } = useRouter()
+  return (
+    <div className={styles.container}>
+      <Head>
+        <title>Create Next App</title>
+        <meta name="description" content="Generated by create next app" />
+        <link rel="icon" href="/favicon.ico" />
+      </Head>
+
+      <main className={styles.main}>
+        <h1 className={styles.title}>Another page</h1>
+      </main>
+
+
+    </div>
+  )
+}

demos/base-path/pages/api/hello.js

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+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+
+export default (req, res) => {
+  res.status(200).json({ name: 'John Doe' })
+}

demos/base-path/pages/dynamic/[dynamic]/index.js

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+function Dynamic() {
+  return <div>This is the page with a dynamic path.</div>
+}
+
+export const getStaticPaths = async () => {
+  return { paths: ['/dynamic/dynamic-1'], fallback: false }
+}
+
+export const getStaticProps = ({ params }) => {
+  return { props: params }
+}
+
+export default Dynamic

demos/base-path/pages/fallback/[dynamic]/index.js

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+function Dynamic() {
+  return <div>This is the page with a dynamic path.</div>
+}
+
+export const getStaticPaths = async () => {
+  return { paths: ['/fallback/dynamic-1'], fallback: 'blocking' }
+}
+
+export const getStaticProps = ({ params }) => {
+  return { props: params }
+}
+
+export default Dynamic

demos/base-path/pages/index.js

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+import Head from 'next/head'
+import Link from 'next/link'
+import { useRouter } from 'next/router'
+import styles from '../styles/Home.module.css'
+
+export default function Home() {
+  const { locale } = useRouter()
+  return (
+    <div className={styles.container}>
+      <Head>
+        <title>Create Next App</title>
+        <meta name="description" content="Generated by create next app" />
+        <link rel="icon" href="/favicon.ico" />
+      </Head>
+
+      <main className={styles.main}>
+        <h1 className={styles.title}>
+          Welcome to <a href="https://nextjs.org">Next.js!</a>
+        </h1>
+
+        <p>The current locale is {locale}</p>
+
+        <div className={styles.grid}>
+          <Link href="/dynamic/dynamic-1" className={styles.card}>
+            <h2>Dynamic Page</h2>
+          </Link>
+          <Link href="/fallback/dynamic-2" className={styles.card}>
+            <h2>Fallback Page</h2>
+          </Link>
+          <Link href="/redirectme" className={styles.card}>
+            <h2>Redirect me</h2>
+          </Link>
+        </div>
+      </main>
+    </div>
+  )
+}

demos/base-path/styles/Home.module.css

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+.container {
+  min-height: 100vh;
+  padding: 0 0.5rem;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  height: 100vh;
+}
+
+.main {
+  padding: 5rem 0;
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+
+.footer {
+  width: 100%;
+  height: 100px;
+  border-top: 1px solid #eaeaea;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+
+.footer a {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  flex-grow: 1;
+}
+
+.title a {
+  color: #0070f3;
+  text-decoration: none;
+}
+
+.title a:hover,
+.title a:focus,
+.title a:active {
+  text-decoration: underline;
+}
+
+.title {
+  margin: 0;
+  line-height: 1.15;
+  font-size: 4rem;
+}
+
+.title,
+.description {
+  text-align: center;
+}
+
+.description {
+  line-height: 1.5;
+  font-size: 1.5rem;
+}
+
+.code {
+  background: #fafafa;
+  border-radius: 5px;
+  padding: 0.75rem;
+  font-size: 1.1rem;
+  font-family: Menlo, Monaco, Lucida Console, Liberation Mono, DejaVu Sans Mono,
+    Bitstream Vera Sans Mono, Courier New, monospace;
+}
+
+.grid {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-wrap: wrap;
+  max-width: 800px;
+  margin-top: 3rem;
+}
+
+.card {
+  margin: 1rem;
+  padding: 1.5rem;
+  text-align: left;
+  color: inherit;
+  text-decoration: none;
+  border: 1px solid #eaeaea;
+  border-radius: 10px;
+  transition: color 0.15s ease, border-color 0.15s ease;
+  width: 45%;
+}
+
+.card:hover,
+.card:focus,
+.card:active {
+  color: #0070f3;
+  border-color: #0070f3;
+}
+
+.card h2 {
+  margin: 0 0 1rem 0;
+  font-size: 1.5rem;
+}
+
+.card p {
+  margin: 0;
+  font-size: 1.25rem;
+  line-height: 1.5;
+}
+
+.logo {
+  height: 1em;
+  margin-left: 0.5rem;
+}
+
+@media (max-width: 600px) {
+  .grid {
+    width: 100%;
+    flex-direction: column;
+  }
+}