init plugin

.babelrc

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+{
+    "ignore": [
+        "node_modules/**/*"
+    ],
+    "presets": [
+        "es2015",
+    ]
+}

.gitignore

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+.DS_Store
+node_modules
+coverage
+npm-debug.log
+dist

.npmignore

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+.DS_Store
+node_modules
+coverage
+npm-debug.log

.travis.yml

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+language: node_js
+node_js:
+  - "4"
+  - "5"
+script:
+  - npm run coveralls

package.json

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+{
+  "name": "stylus-import-if-exist",
+  "version": "1.0.0",
+  "description": "Stylus import which does not fail when import non-exist files",
+  "main": "dist/index.js",
+  "scripts": {
+    "test": "mocha --compilers js:babel-core/register",
+    "build": "babel src --out-dir dist",
+    "coverage": "isparta cover _mocha index.js --include-all-sources -- --require babel-core/register",
+    "prepublish": "npm run build",
+    "precoveralls": "npm run coverage",
+    "coveralls": "coveralls < coverage/lcov.info"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/dzhiriki/stylus-import-if-exist.git"
+  },
+  "keywords": [
+    "stylus",
+    "import"
+  ],
+  "author": "Aleksandr Petrov <[email protected]> (https://github.com/dzhiriki)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/dzhiriki/stylus-import-if-exist/issues"
+  },
+  "homepage": "https://github.com/dzhiriki/stylus-import-if-exist#readme",
+  "devDependencies": {
+    "babel": "^6.5.1",
+    "babel-cli": "^6.5.1",
+    "babel-core": "^6.5.1",
+    "babel-preset-es2015": "^6.5.0",
+    "chai": "^3.5.0",
+    "coveralls": "^2.11.6",
+    "isparta": "^4.0.0",
+    "mocha": "^2.4.5",
+    "stylus": "^0.53.0"
+  },
+  "dependencies": {
+    "glob": "^7.0.0"
+  },
+  "peerDependencies": {
+    "stylus": "1.x"
+  }
+}

readme.md

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+Stylus Import If Exist
+=================
+
+[![Build Status](https://travis-ci.org/dzhiriki/stylus-import-if-exist.svg?branch=master)](https://travis-ci.org/dzhiriki/stylus-import-if-exist)
+[![Coverage Status](https://coveralls.io/repos/github/dzhiriki/stylus-import-if-exist/badge.svg?branch=master)](https://coveralls.io/github/dzhiriki/stylus-import-if-exist?branch=master)
+[![Dependency Status](https://david-dm.org/dzhiriki/stylus-import-if-exist.svg?style=flat-square)](https://david-dm.org/dzhiriki/stylus-import-if-exist)
+
+Stylus fail build when you try import file which not exist. In some cases it's bad behavior.
+This plugin solve this problem.
+
+### Installation
+
+You can install through npm as such: `npm install stylus-import-if-exist`
+
+### Usage
+
+You can include stylus-import-if-exist as a normal stylus plugin. Example:
+
+```js
+var stylus = require('stylus');
+var importIfExist = require('stylus-import-if-exist');
+
+stylus(css)
+  .use(importIfExist())
+  .render(function(err, output){
+    console.log(output);
+  });
+```
+
+You should replace all your `@import` with `import()`. For example, instead use `@import 'example'` you should use `import(example)`. If file exist, it will be imported; if not  – nothing will happen.

src/index.js

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+import stylus, { nodes } from 'stylus';
+import path from 'path';
+import glob from 'glob';
+
+export default () => (style) => {
+  style.define('import', (file) => {
+    const res = new nodes.Root();
+    const dirname = path.dirname(file.filename);
+    const wildcard = path.join(dirname, file.val).replace(/(\.styl)?$/, '.styl');
+    const files = glob.sync(wildcard);
+
+    files.forEach((file) => {
+      res.push(
+        new nodes.Import(
+          new nodes.String(file)
+        )
+      );
+    });
+
+    return res;
+  })
+}

test/fixtures/import-real.styl

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+@import 'sample/1'
+@import 'sample/2'

test/fixtures/import-wildcard-real.styl

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+@import 'sample/*';

test/fixtures/import-wildcard.styl

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+import('sample/*');

test/fixtures/import.styl

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+import('sample/1')
+import('sample/2')

test/fixtures/not-exist.styl

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+import('some/file/which/not/exist');

test/fixtures/sample/1.styl

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+div
+  display inline-block

test/fixtures/sample/2.styl

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+span
+  display block

test/index.js

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+import { expect } from 'chai';
+import path from 'path';
+import fs from 'fs';
+import stylus from 'stylus';
+import importIfExist from '../src/index.js';
+
+const testPath = path.join(__dirname, 'fixtures');
+
+function getFile(file) {
+  return fs.readFileSync(file, 'utf8');
+}
+
+function render(file) {
+  return new Promise(function(resolve, reject) {
+    const fileName = path.join(testPath, `${file}.styl`)
+    stylus(getFile(fileName))
+      .use(importIfExist())
+      .set('filename', fileName)
+      .render((err, css) => {
+        if (err) {
+          reject(err);
+          return;
+        };
+
+        resolve(css);
+      })
+  })
+}
+
+describe('import', () => {
+  it('should not fail on import not-exist file', () =>
+    render('not-exist')
+  )
+
+  it('should contain same styles as real import when import files', () =>
+    Promise.all([render('import'), render('import-real')])
+      .then(([importContent, importRealContent]) =>
+        expect(importContent).to.equal(importRealContent)
+      )
+  )
+
+  it('should contain same styles as real import when import by wildcard', () =>
+    Promise.all([render('import-wildcard'), render('import-wildcard-real')])
+      .then(([importContent, importRealContent]) =>
+        expect(importContent).to.equal(importRealContent)
+      )
+    )
+})