Initial version

Author: frostney

package.json

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+{
+  "name": "rollup-plugin-alias",
+  "version": "1.0.0",
+  "description": "Resolves index.js files with Rollup",
+  "main": "dist/rollup-plugin-alias.js",
+  "jsnext:main": "dist/rollup-plugin-alias.es2015.js",
+  "scripts": {
+    "prebuild": "rimraf dist",
+    "build": "rollup-babel-lib-bundler -f cjs,es6 src/index.js",
+    "prepublish": "npm run build",
+    "lint": "eslint .",
+    "pretest": "npm-run-all -p build lint",
+    "test": "ava test/index.js",
+    "coverage": "nyc npm test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/frostney/rollup-plugin-alias.git"
+  },
+  "keywords": [
+    "rollup",
+    "rollup-plugin",
+    "resolve",
+    "alias"
+  ],
+  "files": [
+    "dist",
+    "src"
+  ],
+  "author": "Johannes Stein",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/frostney/rollup-plugin-alias/issues"
+  },
+  "homepage": "https://github.com/frostney/rollup-plugin-aliar#readme",
+  "devDependencies": {
+    "ava": "^0.12.0",
+    "babel-preset-es2015-loose-rollup": "^7.0.0",
+    "coveralls": "^2.11.8",
+    "eslint": "^2.2.0",
+    "eslint-config-airbnb": "^6.0.2",
+    "npm-run-all": "^1.5.1",
+    "nyc": "^5.6.0",
+    "rimraf": "^2.5.2",
+    "rollup": "^0.25.4",
+    "rollup-babel-lib-bundler": "^2.2.4"
+  }
+}

src/.babelrc

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+{
+  "presets": ["es2015-loose-rollup"]
+}

src/index.js

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+import path from 'path';
+
+export default function alias(options = {}) {
+  return {
+    resolveId(importee, importer) {
+      if (Object.keys(options).length === 0) {
+        return null;
+      }
+
+      const aliasKeys = Object.keys(options);
+      const aliasIndex = aliasKeys.indexOf(importee);
+
+      if (aliasIndex >= 0) {
+        const entry = options[aliasKeys[aliasIndex]];
+
+        if (entry.indexOf('./') === 0) {
+          const basename = path.basename(importer);
+          const directory = importer.split(basename)[0];
+
+          // TODO: Is there a way not to have the extension being defined explicitly?
+          return path.resolve(directory, entry) + '.js';
+        }
+
+        return entry;
+      }
+
+      return null;
+    },
+  };
+}

test/files/aliasMe.js

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+export default 42;

test/files/index.js

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+import nonAliased from './nonAliased';
+import fancyNumber from 'fancyNumber';
+import anotherFancyNumber from './anotherFancyNumber';
+
+export default fancyNumber + anotherFancyNumber + nonAliased;

test/files/localAliasMe.js

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+export default 42;

test/files/nonAliased.js

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+export default 24;

test/index.js

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+import test from 'ava';
+
+import path from 'path';
+
+import { rollup } from 'rollup';
+import alias from '../dist/rollup-plugin-alias';
+
+test(t =>
+  rollup({
+    entry: './files/index.js',
+    plugins: [alias({
+      fancyNumber: './aliasMe',
+      './anotherFancyNumber': './localAliasMe',
+    })],
+  }).then(stats => {
+    t.is(path.basename(stats.modules[0].id), 'nonAliased.js');
+    t.is(path.basename(stats.modules[1].id), 'aliasMe.js');
+    t.is(path.basename(stats.modules[2].id), 'localAliasMe.js');
+    t.is(path.basename(stats.modules[3].id), 'index.js');
+    t.is(stats.modules.length, 4);
+  })
+);