Move map constructing code into a function

Author: khiga8

lib/utils/get-role.js

@@ -3,27 +3,38 @@ const {elementRoles} = require('aria-query')
 const {getElementType} = require('./get-element-type')
 const ObjectMap = require('./object-map')
 
-// Clean-up `elementRoles` from `aria-query`.
-const elementRolesMap = new ObjectMap()
-for (const [key, value] of elementRoles.entries()) {
-  // - Remove empty `attributes` key
-  if (!key.attributes || key.attributes?.length === 0) {
-    delete key.attributes
+const elementRolesMap = cleanElementRolesMap()
+
+/*
+  Returns an element roles map which uses `aria-query`'s elementRoles as the foundation.
+  We additionally clean the data so we're able to fetch a role using a key we construct based on the node we're looking at.
+  In a few scenarios, we stray from the roles returned by `aria-query` and hard code the mapping.
+*/
+function cleanElementRolesMap() {
+  const rolesMap = new ObjectMap()
+
+  for (const [key, value] of elementRoles.entries()) {
+    // - Remove empty `attributes` key
+    if (!key.attributes || key.attributes?.length === 0) {
+      delete key.attributes
+    }
+    rolesMap.set(key, value)
   }
-  elementRolesMap.set(key, value)
-}
-// Remove insufficiently-disambiguated `menuitem` entry
-elementRolesMap.delete({name: 'menuitem'})
-// Disambiguate `menuitem` and `menu` roles by `type`
-elementRolesMap.set({name: 'menuitem', attributes: [{name: 'type', value: 'command'}]}, ['menuitem'])
-elementRolesMap.set({name: 'menuitem', attributes: [{name: 'type', value: 'radio'}]}, ['menuitemradio'])
-elementRolesMap.set({name: 'menuitem', attributes: [{name: 'type', value: 'toolbar'}]}, ['toolbar'])
-elementRolesMap.set({name: 'menu', attributes: [{name: 'type', value: 'toolbar'}]}, ['toolbar'])
+  // Remove insufficiently-disambiguated `menuitem` entry
+  rolesMap.delete({name: 'menuitem'})
+  // Disambiguate `menuitem` and `menu` roles by `type`
+  rolesMap.set({name: 'menuitem', attributes: [{name: 'type', value: 'command'}]}, ['menuitem'])
+  rolesMap.set({name: 'menuitem', attributes: [{name: 'type', value: 'radio'}]}, ['menuitemradio'])
+  rolesMap.set({name: 'menuitem', attributes: [{name: 'type', value: 'toolbar'}]}, ['toolbar'])
+  rolesMap.set({name: 'menu', attributes: [{name: 'type', value: 'toolbar'}]}, ['toolbar'])
 
-/* These have constraints defined in aria-query's `elementRoles` which depend on knowledge of ancestor roles which we cant accurately determine in a linter context.
-   However, we benefit more from assuming the role, than assuming it's generic or undefined so we opt to hard code the mapping */
-elementRolesMap.set({name: 'aside'}, ['complementary']) // `aside` still maps to `complementary` in https://www.w3.org/TR/html-aria/#docconformance.
-elementRolesMap.set({name: 'li'}, ['listitem']) // `li` can be generic if it's not within a list but we would never want to render `li` outside of a list.
+  /* These have constraints defined in aria-query's `elementRoles` which depend on knowledge of ancestor roles which we cant accurately determine in a linter context.
+     However, we benefit more from assuming the role, than assuming it's generic or undefined so we opt to hard code the mapping */
+  rolesMap.set({name: 'aside'}, ['complementary']) // `aside` still maps to `complementary` in https://www.w3.org/TR/html-aria/#docconformance.
+  rolesMap.set({name: 'li'}, ['listitem']) // `li` can be generic if it's not within a list but we would never want to render `li` outside of a list.
+
+  return rolesMap
+}
 
 /*
   Determine role of an element, based on its name and attributes.