add gatsby version check

package.json

@@ -51,6 +51,7 @@
  "promise-queue": "2.2.5",
  "query-string": "6.14.1",
  "regenerator-runtime": "^0.13.3",
+ "semver": "^7.3.5",
  "unist-util-visit": "^2.0.3"
  },
  "keywords": [

src/utils.js

@@ -1,4 +1,6 @@
 const { SiteClient, Loader } = require('datocms-client');
+const { getGatsbyVersion } = require("gatsby-core-utils"); 
+const { lt, prerelease } = require("semver"); 
 
 const CLIENT_HEADERS = {
  'X-Reason': 'dump',
@@ -57,7 +59,15 @@ async function getLoader({ cache, loadStateFromCache, ...options }) {
  return loader;
 }
 
-let nodeManifestWarningWasLogged;
+let warnOnceForNoSupport = false;
+let warnOnceToUpgradeGatsby = false; 
+
+const GATSBY_VERSION_MANIFEST_V2 = `4.3.0`
+const gatsbyVersion = getGatsbyVersion()
+const gatsbyVersionIsPrerelease = prerelease(gatsbyVersion)
+const shouldUpgradeGatsbyVersion =
+ lt(gatsbyVersion, GATSBY_VERSION_MANIFEST_V2) && !gatsbyVersionIsPrerelease
+
 
 const datocmsCreateNodeManifest = ({ node, context }) => {
  try {
@@ -69,7 +79,12 @@ const datocmsCreateNodeManifest = ({ node, context }) => {
  const shouldCreateNodeManifest = createNodeManifestIsSupported && nodeNeedsManifestCreated;
 
  if (shouldCreateNodeManifest) {
-
+ if (shouldUpgradeGatsbyVersion && !warnOnceToUpgradeGatsby) {
+ console.warn(
+ `Your site is doing more work than it needs to for Preview, upgrade to Gatsby ^${GATSBY_VERSION_MANIFEST_V2} for better performance`
+ )
+ warnOnceToUpgradeGatsby = true
+ }
  // Example manifestId: "34324203-2021-07-08T21:52:28.791+01:00"
  const manifestId = `${node.entityPayload.id}-${updatedAt}`;
 
@@ -78,11 +93,11 @@ const datocmsCreateNodeManifest = ({ node, context }) => {
  node,
  updatedAt
  });
- } else if (!createNodeManifestIsSupported && !nodeManifestWarningWasLogged) {
+ } else if (!createNodeManifestIsSupported && !warnOnceForNoSupport) {
  console.warn(
  `DatoCMS: Your version of Gatsby core doesn't support Content Sync (via the unstable_createNodeManifest action). Please upgrade to the latest version to use Content Sync in your site.`,
  );
- nodeManifestWarningWasLogged = true;
+ warnOnceForNoSupport = true;
  }
  } catch (e) {
  console.info(`Cannot create node manifest`, e.message);