add test cases

src/fixtures/expected/gatsby-config.js

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+import { resolve } from 'path'
+
+export default {
+  alias: {
+    'style': resolve(__dirname, './assets/style')
+  },
+  pathPrefix: '/amazing-new-repo/',/* test */
+}

src/fixtures/expected/gatsby-config.old.js

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+module.exports = {
+  pathPrefix: '/amazing-new-repo/'
+}

src/fixtures/expected/next.config.js

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+
+import { resolve } from 'path'
+
+export default {
+  alias: {
+    'style': resolve(__dirname, './assets/style')
+  },
+  basePath: '/amazing-new-repo/'/* test */,
+}

src/fixtures/expected/next.config.old.js

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+module.exports={
+    basePath: '/amazing-new-repo/'/* test */,
+  }
+  

src/fixtures/expected/next.config.old.missing.js

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+module.exports={
+    basePath: '/amazing-new-repo/'
+}
+  

src/fixtures/expected/nuxt.config.js

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+import { resolve } from 'path'
+
+export default {
+  alias: {
+    'style': resolve(__dirname, './assets/style')
+  },
+  target: 'static',
+  router: {
+    base: '/amazing-new-repo/'
+  }
+}

src/fixtures/expected/nuxt.config.missing.js

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+import { resolve } from 'path'
+
+export default {
+  router: {
+        base: '/amazing-new-repo/'
+    },
+alias: {
+    'style': resolve(__dirname, './assets/style')
+  },
+  target: 'static'
+}

src/fixtures/expected/nuxt.config.old.js

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+
+module.exports={
+  alias: {
+    'style': resolve(__dirname, './assets/style')
+  },
+  target: 'static',
+  router: {
+    base: '/amazing-new-repo/'
+  }
+}