Change local error to a warn for now, may want to do something different later

Author: Laurie Barth

packages/gatsby-plugin-theme-ui/gatsby-node.js

@@ -5,24 +5,13 @@ exports.onPreInit = (__, options) => {
     try {
       options.preset = require(preset)
     } catch {
-      reporter.error(
-        `It appears your theme dependency is not installed. Try running \`${generateInstallInstructions()} ${themeModule}\``
+      reporter.warn(
+        `It appears your theme dependency is not installed. Only local styles will appear.`
       )
     }
   }
 }
 
-function generateInstallInstructions() {
-  const { getConfigStore } = require(`gatsby-core-utils`)
-
-  const packageMangerConfigKey = `cli.packageManager`
-  const PACKAGE_MANGER = getConfigStore().get(packageMangerConfigKey) || `yarn`
-
-  const installKeyWord = PACKAGE_MANGER === `yarn` ? 'add' : 'install'
-
-  return `${PACKAGE_MANGER} ${installKeyWord}`
-}
-
 exports.createSchemaCustomization = ({ actions }) => {
   const { createTypes } = actions
 

packages/gatsby-plugin-theme-ui/package.json

@@ -6,8 +6,7 @@
   "license": "MIT",
   "peerDependencies": {
     "gatsby": "^2.13.1",
-    "theme-ui": "^0.3.0",
-    "gatsby-core-utils": "^1.2.0"
+    "theme-ui": "^0.3.0"
   },
   "keywords": [
     "gatsby",