Alias feature detection includes icons package

package.json

@@ -86,7 +86,8 @@
     "react": ">=17.x",
     "react-dom": "^17.0.2",
     "react-test-renderer": "^17.0.2",
-    "rollup": "^2.64.0"
+    "rollup": "^2.64.0",
+    "semver": "^7.3.7"
   },
   "dependencies": {
     "prop-types": "^15.8.1"

src/components/__fixtures__/helpers.js

@@ -2,13 +2,24 @@ import React from 'react'
 import FontAwesomeIcon from '../FontAwesomeIcon'
 import renderer from 'react-test-renderer'
 import { parse } from '@fortawesome/fontawesome-svg-core'
+import semver from 'semver'
+
+const SVG_ICONS_VERSION = semver.parse(
+  require('@fortawesome/free-solid-svg-icons/package.json').version
+)
 
 export const REFERENCE_ICON_BY_STYLE = 0x00
 export const ICON_ALIASES = 0x01
 export const REFERENCE_ICON_USING_STRING = 0x02
 
 export function coreHasFeature (feature) {
-  if (feature === REFERENCE_ICON_BY_STYLE || feature === ICON_ALIASES || feature === REFERENCE_ICON_USING_STRING) {
+  if (feature === ICON_ALIASES) {
+    // Aliases were not introduced until version 6 so we need to check the
+    // installed free-solid-svg-icons package as well.
+    return parse.icon && SVG_ICONS_VERSION.major >= 6
+  }
+
+  if (feature === REFERENCE_ICON_BY_STYLE || feature === REFERENCE_ICON_USING_STRING) {
     return parse.icon
   }
 }