Add err.sh for getStaticProps error (#10619)

* Add err.sh for getStaticProps error

* Prettify error

Co-authored-by: Joe Haddad <timer150@gmail.com>

errors/invalid-getstaticprops-value.md

@@ -0,0 +1,17 @@
+# Invalid unstable_getStaticProps Return Value
+
+#### Why This Error Occurred
+
+In one of the page's `unstable_getStaticProps` the return value had the incorrect shape.
+
+#### Possible Ways to Fix It
+
+Make sure to return the following shape from `unstable_getStaticProps`:
+
+```js
+export async function unstable_getStaticProps() {
+  return {
+    props: { [key: string]: any }
+  }
+}
+```

packages/next/cli/next-build.ts

@@ -45,7 +45,7 @@ const nextBuild: cliCommand = argv => {
   build(dir)
     .then(() => process.exit(0))
     .catch(err => {
-      // tslint:disable-next-line
+      console.error('')
       console.error('> Build error occurred')
       printAndExit(err)
     })

packages/next/export/worker.js

@@ -264,8 +264,8 @@ export default async function({
     return results
   } catch (error) {
     console.error(
-      `\nError occurred prerendering page "${path}" https://err.sh/zeit/next.js/prerender-error:`,
-      error
+      `\nError occurred prerendering page "${path}" https://err.sh/next.js/prerender-error:\n` +
+        error
     )
     return { ...results, error: true }
   }

packages/next/next-server/server/render.tsx

@@ -246,7 +246,8 @@ const invalidKeysMsg = (methodName: string, invalidKeys: string[]) => {
   return (
     `Additional keys were returned from \`${methodName}\`. Properties intended for your component must be nested under the \`props\` key, e.g.:` +
     `\n\n\treturn { props: { title: 'My Title', content: '...' } }` +
-    `\n\nKeys that need to be moved: ${invalidKeys.join(', ')}.`
+    `\n\nKeys that need to be moved: ${invalidKeys.join(', ')}.` +
+    `\nRead more: https://err.sh/next.js/invalid-getstaticprops-value`
   )
 }