Yarn Build Plugin for Netlify

.netlify/netlify-plugin-yarn/index.js

@@ -0,0 +1,24 @@
+module.exports = {
+  onPreBuild: async ({ utils: { build, run } }) => {
+    const cacheDir = ".yarn_cache";
+
+    process.env["YARN_CACHE_FOLDER"] = `${process.env.HOME}/${cacheDir}`;
+    process.env[
+      "NETLIFY_CACHE_DIR"
+    ] = `${process.env.NETLIFY_BUILD_BASE}/cache`;
+
+    try {
+      await run.command(
+        `mv ${process.env.NETLIFY_CACHE_DIR}/${cacheDir} ${process.env.YARN_CACHE_FOLDER}`
+      );
+    } catch (error) {
+      console.log("No yarn cache found");
+    }
+
+    try {
+      await run.command("corepack enable");
+    } catch (error) {
+      return build.failBuild(error);
+    }
+  },
+};

.netlify/netlify-plugin-yarn/manifest.yml

@@ -0,0 +1,2 @@
+name: netlify-plugin-yarn
+inputs: []

netlify.toml

@@ -4,14 +4,21 @@ command = "CI='' yarn run build"
 
 ## Yarn 3 cache does not work out of the box as of Jan 2022. Context:
 ## https://github.com/netlify/build/issues/1535#issuecomment-1021947989
-[build.environment]
-NETLIFY_USE_YARN = "true"
-YARN_VERSION = "3.2.1"
-YARN_FLAGS = "--check-cache"
-YARN_CACHE_FOLDER = "/opt/buildhome/.yarn_cache"
+## [build.environment]
+## NETLIFY_USE_YARN = "true"
+## YARN_VERSION = "3.2.1"
+## YARN_FLAGS = "--check-cache"
+## YARN_CACHE_FOLDER = "/opt/buildhome/.yarn_cache"
 ## YARN_ENABLE_GLOBAL_CACHE = "true"
 ## YARN_GLOBAL_FOLDER = "/opt/buildhome/.yarn_cache"
 
+[build.environment]
+NODE_VERSION = "16"
+NPM_FLAGS = "--version"
+
+[[plugins]]
+package = "/.netlify/netlify-plugin-yarn"
+
 [[redirects]]
 from = "/api/*"
 to = "https://careapi.coronasafe.in/api/:splat"

package.json

@@ -244,5 +244,9 @@
       "react-app"
     ]
   },
+  "engines": {
+    "node": "16.x",
+    "yarn": "3.2.1"
+  },
   "packageManager": "[email protected]"
 }