fix(gatsby-dev-cli): resolve correct versions of packages with unpkg (#33551)

* fix(gatsby-dev-cli): resolve correct versions of packages with unpkg

* a bit more details in case of errors

* defaults for deps

Author: vladar

packages/gatsby-dev-cli/src/utils/check-deps-changes.js

@@ -60,16 +60,16 @@ exports.checkDepsChanges = async ({
     // this allow us to not publish to local repository
     // and save some time/work
     try {
-      const response = await got(
-        `https://unpkg.com/${packageName}/package.json`
-      )
+      const version = getPackageVersion(packageName)
+      const url = `https://unpkg.com/${packageName}@${version}/package.json`
+      const response = await got(url)
       if (response?.statusCode !== 200) {
-        throw new Error(`No response or non 200 code`)
+        throw new Error(`No response or non 200 code for ${url}`)
       }
       localPKGjson = JSON.parse(response.body)
-    } catch {
+    } catch (e) {
       console.log(
-        `'${packageName}' doesn't seem to be installed and is not published on NPM.`
+        `'${packageName}' doesn't seem to be installed and is not published on NPM. Error: ${e.message}`
       )
       return {
         didDepsChanged: true,
@@ -182,3 +182,12 @@ exports.checkDepsChanges = async ({
     packageNotInstalled,
   }
 }
+
+function getPackageVersion(packageName) {
+  const projectPackageJson = JSON.parse(
+    fs.readFileSync(`./package.json`, `utf-8`)
+  )
+  const { dependencies = {}, devDependencies = {} } = projectPackageJson
+  const version = dependencies[packageName] || devDependencies[packageName]
+  return version || `latest`
+}