cheerio is used outside of tests so must be a dependency not a

devDependency

package.json

@@ -26,6 +26,7 @@
     "broccoli-merge-trees": "^3.0.1",
     "broccoli-plugin": "^1.3.1",
     "chalk": "^2.4.1",
+    "cheerio": "^1.0.0-rc.3",
     "ember-cli-babel": "^7.1.0",
     "ember-cli-lodash-subset": "2.0.1",
     "ember-cli-preprocess-registry": "^3.1.2",
@@ -41,11 +42,11 @@
   "devDependencies": {
     "body-parser": "^1.18.3",
     "broccoli-asset-rev": "^3.0.0",
+    "broccoli-file-creator": "^1.1.1",
     "broccoli-test-helper": "^1.5.0",
     "chai": "^4.1.2",
     "chai-fs": "^2.0.0",
     "chai-string": "^1.4.0",
-    "cheerio": "^1.0.0-rc.3",
     "co": "^4.6.0",
     "ember-ajax": "^3.1.0",
     "ember-cli": "~3.3.0",
@@ -75,8 +76,7 @@
     "release-it": "^12.0.1",
     "release-it-lerna-changelog": "^1.0.2",
     "request": "^2.88.0",
-    "rsvp": "^4.8.3",
-    "broccoli-file-creator": "^1.1.1"
+    "rsvp": "^4.8.3"
   },
   "engines": {
     "node": "6.* || 8.* || >= 10.*"

yarn.lock

@@ -2394,6 +2394,7 @@ check-error@^1.0.1:
 cheerio@^1.0.0-rc.3:
   version "1.0.0-rc.3"
   resolved "https://registry.yarnpkg.com/cheerio/-/cheerio-1.0.0-rc.3.tgz#094636d425b2e9c0f4eb91a46c05630c9a1a8bf6"
+  integrity sha512-0td5ijfUPuubwLUu0OBoe98gZj8C/AA+RW3v67GPlGOrvxWjZmBXiBCRU+I8VEiNyJzjth40POfHiz2RB3gImA==
   dependencies:
     css-select "~1.2.0"
     dom-serializer "~0.1.1"