New: Allow options to be passed to prettier.getFileInfo

README.md

@@ -121,6 +121,16 @@ For the list of every available exclusion rule set, please see the [readme of es
       }]
       ```
 
+    - `fileInfoOptions`: Options that are passed to [prettier.getFileInfo](https://prettier.io/docs/en/api.html#prettiergetfileinfofilepath-options) to decide whether a file needs to be formatted. Can be used for example to opt-out from ignoring files located in `node_modules` directories.
+
+      ```json
+      "prettier/prettier": ["error", {}, {
+        "fileInfoOptions": {
+          "withNodeModules": true
+        }
+      }]
+      ```
+
 - The rule is autofixable -- if you run `eslint` with the `--fix` flag, your code will be formatted according to `prettier` style.
 
 ---

eslint-plugin-prettier.js

@@ -131,7 +131,12 @@ module.exports = {
           {
             type: 'object',
             properties: {
-              usePrettierrc: { type: 'boolean' }
+              usePrettierrc: { type: 'boolean' },
+              fileInfoOptions: {
+                type: 'object',
+                properties: {},
+                additionalProperties: true
+              }
             },
             additionalProperties: true
           }
@@ -140,6 +145,8 @@ module.exports = {
       create(context) {
         const usePrettierrc =
           !context.options[1] || context.options[1].usePrettierrc !== false;
+        const eslintFileInfoOptions =
+          (context.options[1] && context.options[1].fileInfoOptions) || {};
         const sourceCode = context.getSourceCode();
         const filepath = context.getFilename();
         const source = sourceCode.text;
@@ -163,9 +170,14 @@ module.exports = {
                 })
               : null;
 
-            const prettierFileInfo = prettier.getFileInfo.sync(filepath, {
-              ignorePath: '.prettierignore'
-            });
+            const prettierFileInfo = prettier.getFileInfo.sync(
+              filepath,
+              Object.assign(
+                {},
+                { ignorePath: '.prettierignore' },
+                eslintFileInfoOptions
+              )
+            );
 
             // Skip if file is ignored using a .prettierignore file
             if (prettierFileInfo.ignored) {

test/invalid/18.txt

@@ -0,0 +1,19 @@
+CODE:
+a();;;;
+
+OUTPUT:
+a();
+
+OPTIONS:
+[{}, { fileInfoOptions: { withNodeModules: true } }]
+
+ERRORS:
+[
+  {
+    message: 'Delete `;;;`',
+    line: 1, column: 5, endLine: 1, endColumn: 8,
+  },
+]
+
+FILENAME:
+node_modules/dummy.js

test/prettier.js

@@ -61,6 +61,11 @@ ruleTester.run('prettier', rule, {
     {
       code: `('');\n`,
       filename: getPrettierRcJsFilename('single-quote', 'dummy.md')
+    },
+    // Should ignore files from node_modules
+    {
+      code: 'a();;;;;;\n',
+      filename: 'node_modules/dummy.js'
     }
   ],
   invalid: [
@@ -81,7 +86,8 @@ ruleTester.run('prettier', rule, {
     '14',
     '15',
     '16',
-    '17'
+    '17',
+    '18'
   ].map(loadInvalidFixture)
 });
 
@@ -130,6 +136,9 @@ function loadInvalidFixture(name) {
     options: eval(sections[3]), // eslint-disable-line no-eval
     errors: eval(sections[4]) // eslint-disable-line no-eval
   };
+  if (sections.length >= 6) {
+    item.filename = sections[5];
+  }
   return item;
 }