fix: add contributors field back (#106)

* feat: add `contributors` field

* style: use `sortPeopleObject` directly

index.js

@@ -12,7 +12,7 @@ const onObject = fn => x => (isPlainObject(x) ? fn(x) : x)
 const sortObjectBy = comparator => onObject(x => sortObjectKeys(x, comparator))
 const sortObject = sortObjectBy()
 const sortURLObject = sortObjectBy(['type', 'url'])
-const sortAuthorObject = sortObjectBy(['name', 'email', 'url'])
+const sortPeopleObject = sortObjectBy(['name', 'email', 'url'])
 const sortDirectories = sortObjectBy(['lib', 'bin', 'man', 'doc', 'example'])
 
 // See https://docs.npmjs.com/misc/scripts
@@ -69,7 +69,11 @@ const fields = [
   { key: 'repository', over: sortURLObject },
   { key: 'funding', over: sortURLObject },
   { key: 'license', over: sortURLObject },
-  { key: 'author', over: sortAuthorObject },
+  { key: 'author', over: sortPeopleObject },
+  {
+    key: 'contributors',
+    over: onArray(contributors => contributors.map(sortPeopleObject)),
+  },
   { key: 'files', over: uniq },
   { key: 'sideEffects' },
   { key: 'type' },

test.js

@@ -199,7 +199,6 @@ for (const field of [
   'name',
   'version',
   'description',
-  'contributors',
   'sideEffects',
   'files',
   'keywords',
@@ -345,6 +344,29 @@ testField('author', [
   },
 ])
 
+// contributors
+assert.deepStrictEqual(
+  Object.keys(
+    sortPackageJson({
+      contributors: [
+        {
+          [UNKNOWN]: UNKNOWN,
+          url: 'http://keithcirkel.co.uk/',
+          name: 'Keith Cirkel',
+          email: '[email protected]',
+        },
+      ],
+    }).contributors[0],
+  ),
+  ['name', 'email', 'url', UNKNOWN],
+)
+assert.deepStrictEqual(
+  sortPackageJson({
+    contributors: ['foo', 'bar', ['foo', 'bar']],
+  }).contributors,
+  ['foo', 'bar', ['foo', 'bar']],
+)
+
 testField('directories', [
   {
     value: {