feat: options ignoreFiles

README.md

@@ -118,6 +118,7 @@ module: {
 - `prefix` - This string is added before every CSS selector.
 - `exclude` - It's possible to avoid prefixing some selectors by passing an array of selectors (strings or regular expressions).
 - `transform` - In cases where you may want to use the prefix differently for different selectors, it is possible to pass in a custom transform method.
+- `ignoreFiles` - List of ignored files for processing.
 
 ## Maintainer
 

index.js

@@ -1,21 +1,29 @@
 module.exports = function postcssPrefixSelector(options) {
   const prefix = options.prefix;
   const prefixWithSpace = /\s+$/.test(prefix) ? prefix : `${prefix} `;
+  const ignoreFiles = options.ignoreFiles ? [].concat(options.ignoreFiles) : [];
 
-  return function(root) {
-    root.walkRules(rule => {
+  return function (root) {
+    if (
+      root.source.input.file &&
+      ignoreFiles.some((file) => root.source.input.file.includes(file))
+    ) {
+      return;
+    }
+
+    root.walkRules((rule) => {
       const keyframeRules = [
         'keyframes',
         '-webkit-keyframes',
         '-moz-keyframes',
-        '-o-keyframes'
+        '-o-keyframes',
       ];
 
       if (rule.parent && keyframeRules.includes(rule.parent.name)) {
         return;
       }
 
-      rule.selectors = rule.selectors.map(selector => {
+      rule.selectors = rule.selectors.map((selector) => {
         if (options.exclude && excludeSelector(selector, options.exclude)) {
           return selector;
         }
@@ -35,7 +43,7 @@ module.exports = function postcssPrefixSelector(options) {
 };
 
 function excludeSelector(selector, excludeArr) {
-  return excludeArr.some(excludeRule => {
+  return excludeArr.some((excludeRule) => {
     if (excludeRule instanceof RegExp) {
       return excludeRule.test(selector);
     }

test/fixtures/ignore-files.css

@@ -0,0 +1,7 @@
+.a {
+  color: coral;
+}
+
+.b {
+  color: deepskyblue;
+}

test/fixtures/ignore-files.expected.css

@@ -0,0 +1,7 @@
+.a {
+  color: coral;
+}
+
+.b {
+  color: deepskyblue;
+}

test/test.js

@@ -7,7 +7,7 @@ it('should prefix a selector', () => {
   const out = postcss()
     .use(
       prefixer({
-        prefix: '.hello '
+        prefix: '.hello ',
       })
     )
     .process(getFixtureContents('single-selector.css')).css;
@@ -21,7 +21,7 @@ it('should prefix a group of selectors', () => {
   const out = postcss()
     .use(
       prefixer({
-        prefix: '.hello '
+        prefix: '.hello ',
       })
     )
     .process(getFixtureContents('group-selectors.css')).css;
@@ -36,7 +36,7 @@ it('should avoid prefixing excluded selectors', () => {
     .use(
       prefixer({
         prefix: '.hello ',
-        exclude: ['body', '.a *:not(.b)', /class-/]
+        exclude: ['body', '.a *:not(.b)', /class-/],
       })
     )
     .process(getFixtureContents('exclude-selectors.css')).css;
@@ -50,7 +50,7 @@ it('should skip @keyframes selectors', () => {
   const out = postcss()
     .use(
       prefixer({
-        prefix: '.hello '
+        prefix: '.hello ',
       })
     )
     .process(getFixtureContents('keyframes.css')).css;
@@ -71,7 +71,7 @@ it('should support an additional callback for prefix transformation', () => {
           }
 
           return prefixedSelector;
-        }
+        },
       })
     )
     .process(getFixtureContents('transform.css')).css;
@@ -81,6 +81,23 @@ it('should support an additional callback for prefix transformation', () => {
   assert.equal(out, expected);
 });
 
+it('should not set prefix a selector in ignore file', () => {
+  const out = postcss()
+    .use(
+      prefixer({
+        prefix: '.hello ',
+        ignoreFiles: ['ignore-files.css'],
+      })
+    )
+    .process(getFixtureContents('ignore-files.css'), {
+      from: 'ignore-files.css',
+    }).css;
+
+  const expected = getFixtureContents('ignore-files.expected.css');
+
+  assert.equal(out, expected);
+});
+
 function getFixtureContents(name) {
   return fs.readFileSync(`test/fixtures/${name}`, 'utf8').trim();
 }