fix: allow non-core file extensions (from plugins) (#128)

src/__tests__/isSupportedExtension.test.js

@@ -6,20 +6,23 @@ afterEach(() => jest.clearAllMocks());
 test('return true when file with supported extension passed in', () => {
   expect(isSupportedExtension(true)('banana.js')).toEqual(true);
   expect(prettier.getFileInfo.sync).toHaveBeenCalledWith('banana.js', {
+    file: 'banana.js',
     resolveConfig: true,
   });
 });
 
 test('return false when file with not supported extension passed in', () => {
   expect(isSupportedExtension(true)('banana.txt')).toEqual(false);
   expect(prettier.getFileInfo.sync).toHaveBeenCalledWith('banana.txt', {
+    file: 'banana.txt',
     resolveConfig: true,
   });
 });
 
 test('do not resolve config when false passed', () => {
   expect(isSupportedExtension(false)('banana.txt')).toEqual(false);
   expect(prettier.getFileInfo.sync).toHaveBeenCalledWith('banana.txt', {
+    file: 'banana.txt',
     resolveConfig: false,
   });
 });

src/isSupportedExtension.js

@@ -1,4 +1,13 @@
-import { getFileInfo } from 'prettier';
+import { getFileInfo, resolveConfig as prettierResolveConfig } from 'prettier';
 
 export default (resolveConfig) => (file) =>
-  Boolean(getFileInfo.sync(file, { resolveConfig }).inferredParser);
+  Boolean(
+    getFileInfo.sync(file, {
+      resolveConfig,
+      ...prettierResolveConfig.sync(
+        file,
+        { editorconfig: true },
+        { filepath: file },
+      ),
+    }).inferredParser,
+  );