Add Plurals to reject the undesired (s) or (es).

Microsoft/Plurals.yml

@@ -0,0 +1,7 @@
+extends: existence
+message: "Don't add '%s' to a singular noun. Use plural instead."
+ignorecase: true
+level: error
+link: https://learn.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/s/s-es
+raw:
+  - '\(s\)|\(es\)'

README.md

@@ -35,8 +35,8 @@ See [Packages](https://vale.sh/hub/microsoft/) for more information.
 
 ## Extension Points
 
-|   Check    |                    Implementation(s)                   |
-|:------------:|:---------------------------------------------------:|
+|   Check    |                    Implementations                   |
+|:------------:|:-------------------------------------------------:|
 | [`existence`](https://errata-ai.github.io/vale/styles/#existence)  | [`Accessibility.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Accessibility.yml), [`Adverbs.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Adverbs.yml), [`AMPM.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/AMPM.yml), [`Auto.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Auto.yml), [`Avoid.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Avoid.yml), [`Dashes.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Dashes.yml), [`DateFormat.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/DateFormat.yml), [`Ellipses.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Ellipses.yml), [`FirstPerson.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/FirstPerson.yml), [`HeadingColons.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/HeadingColons.yml), [`HeadingPunctuation.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/HeadingPunctuation.yml), [`Hyphens.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Hyphens.yml), [`OxfordComma.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/OxfordComma.yml), [`Passive.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Passive.yml), [`Quotes.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Quotes.yml) |
 | [`substitution`](https://errata-ai.github.io/vale/styles/#substitution)  | [`Backend.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Backend.yml) (POS tags), [`ComplexWords.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/ComplexWords.yml), [`Contractions.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Contractions.yml), [`Foreign.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Foreign.yml), [`Terms.yml`](https://github.com/errata-ai/Microsoft/blob/master/Microsoft/Terms.yml) |
 | [`occurrence`](https://errata-ai.github.io/vale/styles/#occurrence)  | N/A |

features/rules.feature

@@ -230,6 +230,14 @@ Feature: Rules
             test.md:5:6:Microsoft.Passive:'are related' looks like passive voice.
             """
 
+    Scenario: Plurals
+        When I test "Plurals"
+        Then the output should contain exactly:
+            """
+            test.md:3:130:Microsoft.Plurals:Don't add '(s)' to a singular noun. Use plural instead.
+            test.md:5:13:Microsoft.Plurals:Don't add '(es)' to a singular noun. Use plural instead.
+            """
+
     Scenario: Sentences
         When I test "Sentences"
         Then the output should contain exactly:

fixtures/Plurals/.vale.ini

@@ -0,0 +1,6 @@
+StylesPath = ../../
+
+MinAlertLevel = suggestion
+
+[*.md]
+Microsoft.Plurals = YES

fixtures/Plurals/test.md

@@ -0,0 +1,5 @@
+# Plurals
+
+This app will use the add-on registry to extend the basic CMS capabilities, so an external add-on can supplement their own add-on(s) to the basic CMS ones.
+
+Use checkbox(es) as needed in your form.