feat: warn if no files are found #642

Author: Ffloriel

packages/purgecss/__tests__/index.test.ts

@@ -91,3 +91,30 @@ describe("PurgeCSS with detailed extractor for html", () => {
     notFindInCSS(expect, ["parent3", "d33ef1", "parent2"], purgedCSS);
   });
 });
+
+describe("Warn if no files are found from the option 'content'", () => {
+  it("warns if no files are found", async () => {
+    const originalConsoleWarn = console.warn;
+    console.warn = jest.fn();
+    await new PurgeCSS().purge({
+      content: ["./__tests__/not-found.js", "./__tests__/not-found.html"],
+      css: [`${ROOT_TEST_EXAMPLES}others/remove_unused.css`]
+    });
+    expect(console.warn).toHaveBeenCalledTimes(1);
+    expect(console.warn).toHaveBeenCalledWith(
+      "No files found from the passed PurgeCSS option 'content'.");
+      console.warn = originalConsoleWarn;
+  })
+
+  it("does not warn if files are found", async () => {
+    const originalConsoleWarn = console.warn;
+    console.warn = jest.fn();
+    await new PurgeCSS().purge({
+      content: [`${ROOT_TEST_EXAMPLES}others/remove_unused.js`],
+      css: [`${ROOT_TEST_EXAMPLES}others/remove_unused.css`]
+    });
+    expect(console.warn).not.toHaveBeenCalled();
+    console.warn = originalConsoleWarn;
+  });
+
+})

packages/purgecss/src/index.ts

@@ -415,25 +415,27 @@ class PurgeCSS {
     extractors: Extractors[]
   ): Promise<ExtractorResultSets> {
     const selectors = new ExtractorResultSets([]);
+    const filesNames: string[] = [];
     for (const globFile of files) {
-      let filesNames: string[] = [];
-
       try {
         await asyncFs.access(globFile, fs.constants.F_OK);
         filesNames.push(globFile);
       } catch (err) {
-        filesNames = glob.sync(globFile, {
+        filesNames.push(...glob.sync(globFile, {
           nodir: true,
           ignore: this.options.skippedContentGlobs,
-        });
-      }
-      for (const file of filesNames) {
-        const content = await asyncFs.readFile(file, "utf-8");
-        const extractor = this.getFileExtractor(file, extractors);
-        const extractedSelectors = await extractSelectors(content, extractor);
-        selectors.merge(extractedSelectors);
+        }));
       }
     }
+    if (filesNames.length === 0) {
+      console.warn("No files found from the passed PurgeCSS option 'content'.")
+    }
+    for (const file of filesNames) {
+      const content = await asyncFs.readFile(file, "utf-8");
+      const extractor = this.getFileExtractor(file, extractors);
+      const extractedSelectors = await extractSelectors(content, extractor);
+      selectors.merge(extractedSelectors);
+    }
     return selectors;
   }