Use pluralize function for pluralization

extensions/ql-vscode/src/pure/word.ts

@@ -7,8 +7,9 @@ export function pluralize(
   numItems: number | undefined,
   singular: string,
   plural: string,
+  numberFormatter: (value: number) => string = (value) => value.toString(),
 ): string {
   return numItems !== undefined
-    ? `${numItems} ${numItems === 1 ? singular : plural}`
+    ? `${numberFormatter(numItems)} ${numItems === 1 ? singular : plural}`
     : "";
 }

extensions/ql-vscode/src/view/data-extensions-editor/LibraryRow.tsx

@@ -3,6 +3,7 @@ import { useCallback, useMemo, useState } from "react";
 import styled from "styled-components";
 import { ExternalApiUsage } from "../../data-extensions-editor/external-api-usage";
 import { ModeledMethod } from "../../data-extensions-editor/modeled-method";
+import { pluralize } from "../../pure/word";
 import { ModeledMethodDataGrid } from "./ModeledMethodDataGrid";
 import { calculateModeledPercentage } from "./modeled";
 import { decimalFormatter, percentFormatter } from "./formatters";
@@ -72,9 +73,14 @@ export const LibraryRow = ({
         {isExpanded ? null : (
           <>
             {" "}
-            ({decimalFormatter.format(externalApiUsages.length)} method
+            (
-            {externalApiUsages.length !== 1 ? "s" : ""},{" "}
+            {pluralize(
-            {percentFormatter.format(modeledPercentage / 100)} modeled)
+              externalApiUsages.length,
+              "method",
+              "methods",
+              decimalFormatter.format.bind(decimalFormatter),
+            )}
+            , {percentFormatter.format(modeledPercentage / 100)} modeled)
           </>
         )}
       </TitleContainer>
@@ -82,12 +88,20 @@ export const LibraryRow = ({
         <>
           <StatusContainer>
             <div>
-              {decimalFormatter.format(externalApiUsages.length)} method
+              {pluralize(
-              {externalApiUsages.length !== 1 ? "s" : ""}
+                externalApiUsages.length,
+                "method",
+                "methods",
+                decimalFormatter.format.bind(decimalFormatter),
+              )}
             </div>
             <div>
-              {decimalFormatter.format(usagesCount)} usage
+              {pluralize(
-              {usagesCount !== 1 ? "s" : ""}
+                usagesCount,
+                "usage",
+                "usages",
+                decimalFormatter.format.bind(decimalFormatter),
+              )}
             </div>
             <div>
               {percentFormatter.format(modeledPercentage / 100)} modeled

extensions/ql-vscode/test/unit-tests/pure/word.test.ts

@@ -14,5 +14,22 @@ describe("word helpers", () => {
     it("should return the empty string if the number is undefined", () => {
       expect(pluralize(undefined, "thing", "things")).toBe("");
     });
+    it("should return an unformatted number when no formatter is specified", () => {
+      expect(pluralize(1_000_000, "thing", "things")).toBe("1000000 things");
+    });
+    it("should return a formatted number when a formatter is specified", () => {
+      const formatter = new Intl.NumberFormat("en-US", {
+        style: "decimal",
+      });
+
+      expect(
+        pluralize(
+          1_000_000,
+          "thing",
+          "things",
+          formatter.format.bind(formatter),
+        ),
+      ).toBe("1,000,000 things");
+    });
   });
 });