feat: unstableNetlifyFunctionsSupport.includeDirs configuration

Author: lindsaylevine

helpers/copyUnstableIncludedDirs.js

@@ -0,0 +1,27 @@
+const path = require('path')
+const fs = require('fs')
+const AdmZip = require('adm-zip')
+const getNetlifyFunctionName = require('../src/lib/helpers/getNetlifyFunctionName')
+
+// This is UNSTABLE support for special use cases needing files served with their Next.js
+// pages that become Netlify functions. Eventually this will be supported internally.
+const copyUnstableIncludedDirs = ({ nextConfig, functionsDist }) => {
+  for (const name in nextConfig.unstableNetlifyFunctionsSupport || {}) {
+    const includeDirs = nextConfig.unstableNetlifyFunctionsSupport[name].includeDirs || []
+    console.log('Processing included dirs for ', name)
+
+    const zipName = path.join(functionsDist, getNetlifyFunctionName(name) + '.zip')
+    const zip = new AdmZip(zipName)
+    includeDirs.forEach((includes) => {
+      if (fs.lstatSync(includes).isDirectory()) {
+        // We add the files at the root of the ZIP because process.cwd()
+        // points to `/` in serverless functions
+        zip.addLocalFolder(includes, includes)
+        console.log(`Added ${includes} to ${zipName}`)
+      }
+    })
+    zip.writeZip(zipName)
+  }
+}
+
+module.exports = copyUnstableIncludedDirs

index.js

@@ -7,6 +7,8 @@ const nextOnNetlify = require('./src/index.js')
 
 const validateNextUsage = require('./helpers/validateNextUsage')
 const doesNotNeedPlugin = require('./helpers/doesNotNeedPlugin')
+const getNextConfig = require('./helpers/getNextConfig')
+const copyUnstableIncludedDirs = require('./helpers/copyUnstableIncludedDirs')
 
 const pWriteFile = util.promisify(fs.writeFile)
 
@@ -58,6 +60,14 @@ module.exports = {
 
     await nextOnNetlify({ functionsDir: FUNCTIONS_SRC, publishDir: PUBLISH_DIR })
   },
+  async onPostBuild({ netlifyConfig, packageJson, constants: { FUNCTIONS_DIST }, utils }) {
+    if (await doesNotNeedPlugin({ netlifyConfig, packageJson, utils })) {
+      return
+    }
+
+    const nextConfig = await getNextConfig(utils.failBuild)
+    copyUnstableIncludedDirs({ nextConfig, functionsDist: FUNCTIONS_DIST })
+  },
 }
 
 const DEFAULT_FUNCTIONS_SRC = 'netlify/functions'