diff --git a/.babelrc b/.babelrc
new file mode 100644
index 000000000..6365fbfff
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,13 @@
+{
+  "presets": [
+    [
+      "es2015",
+      {
+        "modules": false
+      }
+    ]
+  ],
+  "plugins": [
+    "external-helpers"
+  ]
+}
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 000000000..a2fa4a85b
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,12 @@
+{
+  "extends": "airbnb-base",
+  "rules": {
+    "import/prefer-default-export": 0,
+    "no-plusplus": 0,
+    "comma-dangle": 0,
+    "no-underscore-dangle": ["error", { "allowAfterThis": true }],
+    "no-param-reassign": ["error", { "props": false }],
+    "no-mixed-operators": 0,
+    "no-prototype-builtins": 0
+  }
+}
diff --git a/.gitignore b/.gitignore
index 00cbbdf53..1041c72b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,7 @@ bower_components
 
 # Compiled binary addons (http://nodejs.org/api/addons.html)
 build/Release
+dist/
 
 # Dependency directories
 node_modules/
@@ -56,4 +57,3 @@ typings/
 
 # dotenv environment variables file
 .env
-
diff --git a/README.md b/README.md
new file mode 100644
index 000000000..a6182ada6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,13 @@
+# CASL
+
+CASL is an isomorphic authorization JavaScript library which restricts what resources a given user is allowed to access. All permissions are defined in a single location (the `Ability` class) and not duplicated across controllers, views, and database queries.
+
+## Installation
+
+```sh
+npm install casl --save
+```
+
+## License
+
+[MIT License](http://www.opensource.org/licenses/MIT)
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 000000000..b79665e50
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2763 @@
+{
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+      "dev": true
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+        }
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+      "dev": true
+    },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "dependencies": {
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true
+        }
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-8.0.2.tgz",
+      "integrity": "sha1-YpmpBVsc78lp/355wdkY3Osiw2A=",
+      "dev": true,
+      "dependencies": {
+        "camelcase": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+          "dev": true
+        },
+        "cliui": {
+          "version": "3.2.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+          "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+          "dev": true,
+          "dependencies": {
+            "string-width": {
+              "version": "1.0.2",
+              "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+              "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+              "dev": true
+            }
+          }
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-7.0.0.tgz",
+      "integrity": "sha1-jQrELxbqVd69MyyvTEA4s+P139k=",
+      "dev": true,
+      "dependencies": {
+        "camelcase": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+          "dev": true
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 000000000..7c6abdce9
--- /dev/null
+++ b/package.json
@@ -0,0 +1,45 @@
+{
+  "name": "casl",
+  "version": "0.1.0",
+  "description": "CASL is an isomorphic authorization JavaScript library which restricts what resources a given user is allowed to access",
+  "main": "dist/umd/index.js",
+  "module": "dist/es6/index.js",
+  "scripts": {
+    "build.es": "rollup -c tools/rollup.es.js",
+    "build.umd": "rollup -c tools/rollup.umd.js",
+    "prebuild": "npm run lint",
+    "build": "npm run build.es && npm run build.umd",
+    "test": "NODE_ENV=test mocha -r ./spec/config ./spec/*.spec.js",
+    "lint": "eslint -c .eslintrc src/",
+    "release": "NODE_ENV=production standard-version && npm run build && npm test"
+  },
+  "keywords": [
+    "access control",
+    "authorization",
+    "acl",
+    "cancan",
+    "security",
+    "permissions"
+  ],
+  "author": "Sergii Stotskyi <sergiy.stotskiy@freaksidea.com>",
+  "license": "MIT",
+  "devDependencies": {
+    "babel-plugin-external-helpers": "^6.22.0",
+    "babel-preset-es2015": "^6.24.1",
+    "chai": "^4.1.0",
+    "chai-spies": "^0.7.1",
+    "eslint": "^4.2.0",
+    "eslint-config-airbnb-base": "^11.2.0",
+    "eslint-plugin-import": "^2.7.0",
+    "mocha": "^3.4.2",
+    "rollup": "^0.45.2",
+    "rollup-plugin-babel": "^2.7.1",
+    "rollup-plugin-commonjs": "^8.0.2",
+    "rollup-plugin-node-resolve": "^3.0.0",
+    "rollup-plugin-uglify": "^2.0.1",
+    "standard-version": "^4.2.0"
+  },
+  "dependencies": {
+    "sift": "~3.3.12"
+  }
+}
diff --git a/spec/ability.spec.js b/spec/ability.spec.js
new file mode 100755
index 000000000..adf00a6d0
--- /dev/null
+++ b/spec/ability.spec.js
@@ -0,0 +1,281 @@
+const { AbilityBuilder, ForbiddenError, Ability } = require('../dist/umd')
+
+class Post {
+  constructor(attrs) {
+    Object.assign(this, attrs)
+  }
+}
+
+describe('Ability', () => {
+  let ability
+
+  it('allows to add alias for actions', () => {
+    Ability.addAlias('modify', ['update', 'delete'])
+    ability = AbilityBuilder.define(can => can('modify', 'Post'))
+
+    expect(ability).to.allow('modify', 'Post')
+  })
+
+  it('allows deeply nested aliased actions', () => {
+    Ability.addAlias('sort', 'increment')
+    Ability.addAlias('modify', ['sort'])
+    ability = AbilityBuilder.define(can => can('modify', 'all'))
+
+    expect(ability).to.allow('increment', 123)
+  })
+
+  it('provides predefined to use "manage" alias for create, read, update, delete', () => {
+    ability = AbilityBuilder.define(can => can('manage', 'Post'))
+
+    expect(ability).to.allow('manage', 'Post')
+    expect(ability).to.allow('create', 'Post')
+    expect(ability).to.allow('read', 'Post')
+    expect(ability).to.allow('update', 'Post')
+    expect(ability).to.allow('delete', 'Post')
+    expect(ability).not.to.allow('any other action', 'Post')
+  })
+
+  it('provides `can` and `cannot` methods to check abilities', () => {
+    ability = AbilityBuilder.define(can => can('read', 'Post'))
+
+    expect(ability.can('read', 'Post')).to.be.true
+    expect(ability.cannot('read', 'Post')).to.be.false
+  })
+
+  it('lists all rules', () => {
+    ability = AbilityBuilder.define((can, cannot) => {
+      can('manage', 'all')
+      can('learn', 'Range')
+      cannot('read', 'String')
+      cannot('read', 'Hash')
+      cannot('preview', 'Array')
+    })
+
+    expect(ability.rules).to.deep.equal([
+      { actions: 'manage', subject: 'all' },
+      { actions: 'learn', subject: 'Range' },
+      { actions: 'read', subject: 'String', inverted: true },
+      { actions: 'read', subject: 'Hash', inverted: true },
+      { actions: 'preview', subject: 'Array', inverted: true },
+    ])
+  })
+
+  it('allows to specify multiple actions and match any', () => {
+    ability = AbilityBuilder.define(can => can(['read', 'update'], 'Post'))
+
+    expect(ability).to.allow('read', 'Post')
+    expect(ability).to.allow('update', 'Post')
+  })
+
+  it('allows to specify multiple subjects and match any', () => {
+    ability = AbilityBuilder.define(can => can('read', ['Post', 'User']))
+
+    expect(ability).to.allow('read', 'Post')
+    expect(ability).to.allow('read', 'User')
+  })
+
+  describe('by default', () => {
+    beforeEach(() => {
+      ability = AbilityBuilder.define(can => {
+        can(['read', 'update'], 'Post')
+        can('delete', 'Post', { creator: 'admin' })
+      })
+    })
+
+    it('allows to perform specified actions on target instance', () => {
+      expect(ability).to.allow('read', new Post())
+      expect(ability).to.allow('update', new Post())
+    })
+
+    it('allows to perform specified actions on target type', () => {
+      expect(ability).to.allow('read', 'Post')
+      expect(ability).to.allow('update','Post')
+    })
+
+    it('disallows to perform unspecified action on target', () => {
+      expect(ability).not.to.allow('archive', 'Post')
+      expect(ability).not.to.allow('archive', new Post())
+    })
+
+    it('disallows to perform action if action or/and target is falsy', () => {
+      expect(ability).not.to.allow(null, 'Post')
+      expect(ability).not.to.allow('read', null)
+    })
+
+    it('disallows to perform action on unspecified target type', () => {
+      expect(ability).not.to.allow('read', 'User')
+    })
+
+    it('allows to perform action if target type matches at least 1 rule with or without conditions', () => {
+      expect(ability).to.allow('delete', 'Post')
+    })
+
+    it('allows to perform action if target instance matches conditions', () => {
+      expect(ability).to.allow('delete', new Post({ creator: 'admin' }))
+    })
+
+    it('disallows to perform action if target instance does not match conditions', () => {
+      expect(ability).not.to.allow('delete', new Post({ creator: 'user' }))
+    })
+
+    describe('`throwUnlessCan` method', () => {
+      it('relies on `cannot` method', () => {
+        ability.cannot = spy(() => false)
+        ability.throwUnlessCan('read', 'Post')
+
+        expect(ability.cannot).to.have.been.called.with.exactly('read', 'Post')
+      })
+
+      it('raises forbidden exception on disallowed action', () => {
+        expect(() => ability.throwUnlessCan('archive', 'Post')).to.throw(ForbiddenError)
+      })
+
+      it('does not raise forbidden exception on allowed action', () => {
+        expect(() => ability.throwUnlessCan('read', 'Post')).not.to.throw(Error)
+      })
+    })
+  })
+
+  describe('rule precedence', () => {
+    it('checks every rule using logical OR operator (the order matters!)', () => {
+      ability = AbilityBuilder.define(can => {
+        can('delete', 'Post', { creator: 'me' })
+        can('delete', 'Post', { sharedWith: { $in: ['me'] } })
+      })
+
+      expect(ability).to.allow('delete', new Post({ creator: 'me' }))
+      expect(ability).to.allow('delete', new Post({ sharedWith: 'me' }))
+    })
+
+    it('checks rules in inverse order', () => {
+      ability = AbilityBuilder.define((can, cannot) => {
+        can('delete', 'Post', { creator: 'me' })
+        cannot('delete', 'Post', { archived: true })
+      })
+
+      expect(ability).not.to.allow('delete', new Post({ creator: 'me', archived: true }))
+      expect(ability).to.allow('delete', new Post({ creator: 'me' }))
+    })
+
+    it('shadows rule with conditions by the same rule without conditions', () => {
+      ability = AbilityBuilder.define(can => {
+        can('manage', 'Post')
+        can('delete', 'Post', { creator: 'me' })
+      })
+
+      expect(ability).to.allow('delete', new Post({ creator: 'someoneelse' }))
+      expect(ability).to.allow('delete', new Post({ creator: 'me' }))
+    })
+
+    it('does not shadow rule with conditions by the same rule if the last one is disallowed by `cannot`', () => {
+      ability = AbilityBuilder.define((can, cannot) => {
+        can('manage', 'Post')
+        cannot('delete', 'Post')
+        can('delete', 'Post', { creator: 'me' })
+      })
+
+      expect(ability).not.to.allow('delete', new Post({ creator: 'someoneelse' }))
+      expect(ability).to.allow('delete', new Post({ creator: 'me' }))
+    })
+
+    it('shadows inverted rule by regular one', () => {
+      ability = AbilityBuilder.define((can, cannot) => {
+        cannot('delete', 'Post', { creator: 'me' })
+        can('manage', 'Post', { creator: 'me' })
+      })
+
+      expect(ability).to.allow('delete', new Post({ creator: 'me' }))
+    })
+
+    it('checks rules for "all" first', () => {
+      ability = AbilityBuilder.define((can, cannot) => {
+        can('delete', 'all')
+        cannot('delete', 'Post')
+      })
+
+      expect(ability).to.allow('delete', 'Post')
+    })
+  })
+
+  describe('rule conditions', () => {
+    it('allows to use equality conditions', () => {
+      ability = AbilityBuilder.define(can => {
+        can('read', 'Post', { creator: 'me' })
+      })
+
+      expect(ability).to.allow('read', new Post({ creator: 'me' }))
+      expect(ability).not.to.allow('read', new Post({ creator: 'someoneelse' }))
+    })
+
+    it('allows to use mongo like `$ne` condition', () => {
+      ability = AbilityBuilder.define(can => {
+        can('read', 'Post', { creator: { $ne: 'me' } })
+      })
+
+      expect(ability).not.to.allow('read', new Post({ creator: 'me' }))
+      expect(ability).to.allow('read', new Post({ creator: 'someoneelse' }))
+    })
+
+    it('allows to use mongo like `$in` condition', () => {
+      ability = AbilityBuilder.define(can => {
+        can('read', 'Post', { state: { $in: ['shared', 'draft'] } })
+      })
+
+      expect(ability).to.allow('read', new Post({ state: 'draft' }))
+      expect(ability).to.allow('read', new Post({ state: 'shared' }))
+      expect(ability).to.allow('read', new Post({ state: ['shared', 'public'] }))
+    })
+
+    it('allows to use mongo like `$all` condition', () => {
+      ability = AbilityBuilder.define(can => {
+        can('read', 'Post', { state: { $all: ['shared', 'draft'] } })
+      })
+
+      expect(ability).not.to.allow('read', new Post({ state: 'draft' }))
+      expect(ability).not.to.allow('read', new Post({ state: 'shared' }))
+      expect(ability).to.allow('read', new Post({ state: ['shared', 'draft'] }))
+    })
+
+    it('allows to use mongo like `$gt` and `$gte` condition', () => {
+      ability = AbilityBuilder.define((can, cannot) => {
+        can('update', 'Post', { views: { $gt: 10 } })
+        cannot('update', 'Post', { views: { $gte: 1000 } })
+      })
+
+      expect(ability).not.to.allow('update', new Post({ views: 9 }))
+      expect(ability).to.allow('update', new Post({ views: 100 }))
+      expect(ability).not.to.allow('update', new Post({ views: 1001 }))
+    })
+
+    it('allows to use mongo like `$lt` and `$lte` condition', () => {
+      ability = AbilityBuilder.define((can, cannot) => {
+        can('update', 'Post', { views: { $lt: 5 } })
+        cannot('update', 'Post', { views: { $lte: 2 } })
+      })
+
+      expect(ability).not.to.allow('update', new Post({ views: 2 }))
+      expect(ability).to.allow('update', new Post({ views: 3 }))
+    })
+
+    it('allows to use mongo like `$exists` condition', () => {
+      ability = AbilityBuilder.define(can => {
+        can('read', 'Post', { views: { $exists: true } })
+      })
+
+      expect(ability).not.to.allow('read', new Post())
+      expect(ability).to.allow('read', new Post({ views: 3 }))
+    })
+
+    it('allows to use mongo like dot notation conditions', () => {
+      ability = AbilityBuilder.define(can => {
+        can('delete', 'Post', { 'authors.0': { $exists: false } })
+        can('update', 'Post', { 'comments.author': 'Ted' })
+      })
+
+      expect(ability).not.to.allow('delete', new Post({ authors: ['me', 'someoneelse'] }))
+      expect(ability).to.allow('delete', new Post({ authors: [] }))
+      expect(ability).to.allow('update', new Post({ comments: [{ author: 'Ted' }, { author: 'John'}] }))
+      expect(ability).not.to.allow('update', new Post({ comments: [{ author: 'John'}] }))
+    })
+  })
+})
diff --git a/spec/config.js b/spec/config.js
new file mode 100755
index 000000000..0dc5039e6
--- /dev/null
+++ b/spec/config.js
@@ -0,0 +1,33 @@
+(function(factory) {
+  if (typeof window === 'object') {
+    window.global = window;
+    factory(window.chai, window);
+  } else if (typeof require === 'function' && typeof module !== 'undefined') {
+    require('chai').use(require('chai-spies'));
+    factory(require('chai'), global);
+  }
+})(function(chai, global) {
+  global.expect = chai.expect;
+  global.spy = chai.spy;
+  chai.Assertion.addMethod('allow', function(action, subject) {
+    const subjectRepresantation = prettifyObject(subject)
+    this.assert(
+      this._obj.can(action, subject),
+      `expected ability to allow ${action} on ${subjectRepresantation}`,
+      `expected ability to not allow ${action} on ${subjectRepresantation}`
+    );
+  });
+
+  function prettifyObject(object) {
+    if (!object || typeof object === 'string') {
+      return object;
+    }
+
+    if (typeof object === 'function') {
+      return object.name;
+    }
+
+    const attrs = JSON.stringify(object);
+    return `${object.constructor.name} { ${attrs[0] === '{' ? attrs.slice(1, -1) : attrs} }`
+  }
+});
diff --git a/spec/mongo-query.spec.js b/spec/mongo-query.spec.js
new file mode 100755
index 000000000..b606336ee
--- /dev/null
+++ b/spec/mongo-query.spec.js
@@ -0,0 +1,129 @@
+const { AbilityBuilder, toMongoQuery } = require('../dist/umd')
+
+describe('Ability MongoDB query', () => {
+  const builder = new AbilityBuilder()
+  const [can, cannot] = [builder.can.bind(builder), builder.cannot.bind(builder)]
+
+  it('is empty if there are no rules with conditions', () => {
+    const query = toMongoQuery([can('read', 'Post')])
+
+    expect(Object.keys(query)).to.be.empty
+  })
+
+  it('OR-es conditions for regular rules', () => {
+    const query = toMongoQuery([
+      can('read', 'Post', { status: 'draft', createdBy: 'someoneelse' }),
+      can('read', 'Post', { status: 'published', createdBy: 'me' })
+    ])
+
+    expect(query).to.deep.equal({
+      $or: [
+        { status: 'draft', createdBy: 'someoneelse' },
+        { status: 'published', createdBy: 'me' }
+      ]
+    })
+  })
+
+  it('AND-es conditions for inverted rules', () => {
+    const query = toMongoQuery([
+      cannot('read', 'Post', { status: 'draft', createdBy: 'someoneelse' }),
+      cannot('read', 'Post', { status: 'published', createdBy: 'me' })
+    ])
+
+    expect(query).to.deep.equal({
+      $and: [
+        { $nor: [{ status: 'draft', createdBy: 'someoneelse' }] },
+        { $nor: [{ status: 'published', createdBy: 'me' }] }
+      ]
+    })
+  })
+
+  it('OR-es conditions for regular rules and AND-es for inverted ones', () => {
+    const query = toMongoQuery([
+      can('read', 'Post', { _id: 'mega' }),
+      can('read', 'Post', { state: 'draft' }),
+      cannot('read', 'Post', { private: true }),
+      cannot('read', 'Post', { state: 'archived' })
+    ])
+
+    expect(query).to.deep.equal({
+      $or: [
+        { _id: 'mega' },
+        { state: 'draft' }
+      ],
+      $and: [
+        { $nor: [{ private: true }] },
+        { $nor: [{ state: 'archived' }] }
+      ]
+    })
+  })
+
+  describe('can find records where property', () => {
+    it('is present', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { isPublished: { $exists: true, $ne: null } })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ isPublished: { $exists: true, $ne: null } }] })
+    })
+
+    it('is blank', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { isPublished: { $exists: false } }),
+        can('read', 'Post', { isPublished: null })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ isPublished: { $exists: false } }, { isPublished: null }] })
+    })
+
+    it('is defined by `$in` criteria', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { state: { $in: ['draft', 'archived'] } })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ state: { $in: ['draft', 'archived'] } }] })
+    })
+
+    it('is defined by `$all` criteria', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { state: { $all: ['draft', 'archived'] } })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ state: { $all: ['draft', 'archived'] } }] })
+    })
+
+    it('is defined by `$lt` and `$lte` criteria', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { views: { $lt: 10 } }),
+        can('update', 'Post', { views: { $lt: 5 } })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ views: { $lt: 10 } }, { views: { $lt: 5 } }] })
+    })
+
+    it('is defined by `$gt` and `$gte` criteria', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { views: { $gt: 10 } }),
+        can('update', 'Post', { views: { $gte: 100 } })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ views: { $gt: 10 } }, { views: { $gte: 100 } }] })
+    })
+
+    it('is defined by `$ne` criteria', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { creator: { $ne: 'me' } })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ creator: { $ne: 'me' } }] })
+    })
+
+    it('is defined by dot notation fields', () => {
+      const query = toMongoQuery([
+        can('read', 'Post', { 'comments.author': 'Ted' })
+      ])
+
+      expect(query).to.deep.equal({ $or: [{ 'comments.author': 'Ted' }] })
+    })
+  })
+})
diff --git a/spec/mongoose-plugin.spec.js b/spec/mongoose-plugin.spec.js
new file mode 100644
index 000000000..a1edec97f
--- /dev/null
+++ b/spec/mongoose-plugin.spec.js
@@ -0,0 +1,87 @@
+const { AbilityBuilder, Ability, mongoosePlugin, toMongoQuery } = require('../dist/umd')
+
+class PostQuery {
+  static get modelName() {
+    return 'Post'
+  }
+
+  find() {
+    this.op = 'find'
+    return this
+  }
+
+  findOne() {
+    this.op = 'findOne'
+    return this
+  }
+
+  exec() {
+    return Promise.resolve(this.op === 'find' ? [] : null)
+  }
+}
+
+describe('Mongoose Plugin', () => {
+  let schema
+  let ability
+
+  beforeEach(() => {
+    const infterface =
+    schema = mongoosePlugin({
+      statics: new PostQuery(),
+      query: new PostQuery()
+    })
+  })
+
+  it('injects `accessibleBy` static method', () => {
+    expect(schema.statics.accessibleBy).to.be.a('function')
+  })
+
+  it('injects `accessibleBy` query method', () => {
+    expect(schema.query.accessibleBy).to.be.a('function')
+    expect(schema.query.accessibleBy).to.equal(schema.statics.accessibleBy)
+  })
+
+  it('creates query which returns empty array or null for ability which does not have rules for specified action', async () => {
+    const query = schema.query.accessibleBy(new Ability())
+    const [items, item] = await Promise.all([query.exec(), query.findOne().exec()])
+
+    expect(items).to.be.an('array').that.is.empty
+    expect(item).not.to.exist
+  })
+
+  describe('`accessibleBy` infterface', () => {
+    beforeEach(() => {
+      ability = AbilityBuilder.define(can => {
+        can('read', 'Post', { state: 'draft' })
+        can('update', 'Post', { state: 'published' })
+      })
+
+      spy.on(ability, 'rulesFor')
+    })
+
+    it('creates query from ability and `read` action by default', () => {
+      schema.query.accessibleBy(ability)
+      expect(ability.rulesFor).to.have.been.called.with.exactly('read', schema.query)
+    })
+
+    it('creates query from ability and specified action', () => {
+      schema.query.accessibleBy(ability, 'delete')
+      expect(ability.rulesFor).to.have.been.called.with.exactly('delete', schema.query)
+    })
+
+    it('calls `find` method of the query', () => {
+      spy.on(schema.query, 'find')
+      schema.query.accessibleBy(ability)
+
+      expect(schema.query.find).to.be.called()
+    })
+
+    it('passes query created by `toMongoQuery` in `find` method of the query', () => {
+      const query = toMongoQuery(ability.rulesFor('read', 'Post'))
+      spy.on(schema.query, 'find')
+      schema.query.accessibleBy(ability)
+
+      expect(schema.query.find).to.be.called.with.exactly(query)
+    })
+  })
+})
diff --git a/src/ability.js b/src/ability.js
new file mode 100755
index 000000000..b69f4ce8b
--- /dev/null
+++ b/src/ability.js
@@ -0,0 +1,124 @@
+import { ForbiddenError } from './error';
+import { Rule } from './rule';
+
+function getSubjectName(subject) {
+  if (!subject || typeof subject === 'string') {
+    return subject;
+  }
+
+  const Type = typeof subject === 'object' ? subject.constructor : subject;
+  return Type.modelName || Type.name;
+}
+
+function clone(object) {
+  return JSON.parse(JSON.stringify(object));
+}
+
+const DEFAULT_ALIASES = {
+  manage: ['create', 'read', 'update', 'delete'],
+};
+const PRIVATE_FIELD = typeof Symbol !== 'undefined' ? Symbol.for('private') : `__private${Date.now()}`;
+
+export class Ability {
+  static addAlias(alias, fields) {
+    DEFAULT_ALIASES[alias] = fields;
+    return this;
+  }
+
+  constructor(rules, { RuleType = Rule, subjectName = getSubjectName } = {}) {
+    this[PRIVATE_FIELD] = {
+      RuleType,
+      subjectName,
+      originalRules: rules,
+      rules: {},
+      aliases: clone(DEFAULT_ALIASES)
+    };
+    this.update(rules);
+  }
+
+  update(rules) {
+    if (Array.isArray(rules)) {
+      this[PRIVATE_FIELD].originalRules = Object.freeze(rules.slice(0));
+      this[PRIVATE_FIELD].rules = this.buildIndexFor(this.rules);
+    }
+
+    return this;
+  }
+
+  buildIndexFor(rules) {
+    const indexedRules = {};
+    const RuleType = this[PRIVATE_FIELD].RuleType;
+
+    for (let i = 0; i < rules.length; i++) {
+      const rule = rules[i];
+      const actions = this.expandActions(rule.actions);
+
+      for (let j = 0; j < actions.length; j++) {
+        const action = actions[j];
+        const subjects = Array.isArray(rule.subject) ? rule.subject : [rule.subject];
+
+        for (let k = 0; k < subjects.length; k++) {
+          const subject = subjects[k];
+          indexedRules[subject] = indexedRules[subject] || {};
+          indexedRules[subject][action] = indexedRules[subject][action] || [];
+          indexedRules[subject][action].unshift(new RuleType(rule));
+        }
+      }
+    }
+
+    return indexedRules;
+  }
+
+  expandActions(rawActions) {
+    const actions = Array.isArray(rawActions) ? rawActions : [rawActions];
+    const aliases = this[PRIVATE_FIELD].aliases;
+
+    return actions.reduce((expanded, action) => {
+      if (aliases.hasOwnProperty(action)) {
+        return expanded.concat(this.expandActions(aliases[action]));
+      }
+
+      return expanded;
+    }, actions);
+  }
+
+  get rules() {
+    return this[PRIVATE_FIELD].originalRules;
+  }
+
+  can(action, subject) {
+    const subjectName = this[PRIVATE_FIELD].subjectName(subject);
+    const rules = this.rulesFor(action, subjectName);
+
+    if (subject === subjectName) {
+      return rules.length > 0;
+    }
+
+    for (let i = 0; i < rules.length; i++) {
+      if (rules[i].matches(subject)) {
+        return !rules[i].inverted;
+      }
+    }
+
+    return false;
+  }
+
+  rulesFor(action, subject) {
+    const subjectName = this[PRIVATE_FIELD].subjectName(subject);
+    const rules = this[PRIVATE_FIELD].rules;
+    const specificRules = rules.hasOwnProperty(subjectName) ? rules[subjectName][action] : null;
+    const generalRules = rules.hasOwnProperty('all') ? rules.all[action] : null;
+
+    return (generalRules || []).concat(specificRules || []);
+  }
+
+  cannot(action, subject) {
+    return !this.can(action, subject);
+  }
+
+  throwUnlessCan(action, subject) {
+    if (this.cannot(action, subject)) {
+      throw new ForbiddenError(`Cannot execute "${action}" on "${this[PRIVATE_FIELD].subjectName(subject)}"`);
+    }
+  }
+}
diff --git a/src/builder.js b/src/builder.js
new file mode 100755
index 000000000..2104aed45
--- /dev/null
+++ b/src/builder.js
@@ -0,0 +1,46 @@
+import { Ability } from './ability';
+
+function isStringOrNonEmptyArray(value) {
+  return typeof value === 'string' || Array.isArray(value) && value.length > 0;
+}
+
+export class AbilityBuilder {
+  static define(params, dsl) {
+    const [options, define] = typeof params === 'function' ? [{}, params] : [params, dsl];
+    const builder = new this();
+    define(builder.can.bind(builder), builder.cannot.bind(builder));
+
+    return new Ability(builder.rules, options);
+  }
+
+  constructor() {
+    this.rules = [];
+  }
+
+  can(actions, subject, conditions) {
+    if (!isStringOrNonEmptyArray(actions)) {
+      throw new TypeError('AbilityBuilder#can expects the first parameter to be an action or array of actions');
+    }
+
+    if (!isStringOrNonEmptyArray(subject)) {
+      throw new TypeError('AbilityBuilder#can expects the second argument to be a subject name or array of subject names');
+    }
+
+    const rule = { actions, subject };
+
+    if (typeof conditions === 'object' && conditions) {
+      rule.conditions = conditions;
+    }
+
+    this.rules.push(rule);
+
+    return rule;
+  }
+
+  cannot(...args) {
+    const rule = this.can(...args);
+    rule.inverted = true;
+
+    return rule;
+  }
+}
diff --git a/src/error.js b/src/error.js
new file mode 100644
index 000000000..8351d137b
--- /dev/null
+++ b/src/error.js
@@ -0,0 +1,12 @@
+export class ForbiddenError extends Error {
+  constructor(message) {
+    super(message);
+    this.constructor = ForbiddenError;
+
+    if (typeof Error.captureStackTrace === 'function') {
+      Error.captureStackTrace(this, this.constructor);
+    } else {
+      this.stack = new Error(this.message).stack;
+    }
+  }
+}
diff --git a/src/index.js b/src/index.js
new file mode 100755
index 000000000..004e805b7
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,5 @@
+export * from './query';
+export * from './ability';
+export * from './rule';
+export * from './builder';
+export * from './error';
diff --git a/src/query/index.js b/src/query/index.js
new file mode 100644
index 000000000..d827b6407
--- /dev/null
+++ b/src/query/index.js
@@ -0,0 +1,2 @@
+export * from './mongoose';
+export * from './query';
diff --git a/src/query/mongoose.js b/src/query/mongoose.js
new file mode 100644
index 000000000..31c22441c
--- /dev/null
+++ b/src/query/mongoose.js
@@ -0,0 +1,30 @@
+import { rulesToQuery } from './query';
+
+function ruleToMongoQuery(rule) {
+  return rule.inverted ? { $nor: [rule.conditions] } : rule.conditions;
+}
+
+function emptyQuery(query) {
+  query.exec = () => Promise.resolve(query.op === 'findOne' ? null : []);
+  return query;
+}
+
+export function toMongoQuery(rules) {
+  return rulesToQuery(rules, ruleToMongoQuery);
+}
+
+function accessibleBy(ability, action = 'read') {
+  const rules = ability.rulesFor(action, this.model || this);
+
+  if (rules.length) {
+    return this.find(toMongoQuery(rules));
+  }
+
+  return emptyQuery(this.find());
+}
+
+export function mongoosePlugin(schema) {
+  schema.query.accessibleBy = accessibleBy;
+  schema.statics.accessibleBy = accessibleBy;
+  return schema;
+}
diff --git a/src/query/query.js b/src/query/query.js
new file mode 100644
index 000000000..9c3954936
--- /dev/null
+++ b/src/query/query.js
@@ -0,0 +1,15 @@
+export function rulesToQuery(rules, convert) {
+  const query = {};
+
+  for (let i = 0; i < rules.length; i++) {
+    const rule = rules[i];
+
+    if (rule.conditions) {
+      const op = rule.inverted ? '$and' : '$or';
+      query[op] = query[op] || [];
+      query[op].push(convert(rule));
+    }
+  }
+
+  return query;
+}
diff --git a/src/rule.js b/src/rule.js
new file mode 100644
index 000000000..7fe7305fc
--- /dev/null
+++ b/src/rule.js
@@ -0,0 +1,15 @@
+import sift from 'sift';
+
+export class Rule {
+  constructor(params) {
+    this.conditions = params.conditions;
+    this.actions = params.actions;
+    this.subject = params.subject;
+    this.inverted = !!params.inverted;
+    this._matches = this.conditions ? sift(this.conditions) : null;
+  }
+
+  matches(object) {
+    return !this._matches || this._matches(object);
+  }
+}
diff --git a/tools/rollup.es.js b/tools/rollup.es.js
new file mode 100644
index 000000000..d81ae97c6
--- /dev/null
+++ b/tools/rollup.es.js
@@ -0,0 +1,16 @@
+import resolve from 'rollup-plugin-node-resolve';
+import commonjs from 'rollup-plugin-commonjs';
+
+export default {
+  entry: 'src/index.js',
+  dest: 'dist/es6/index.js',
+  format: 'es',
+  plugins: [
+    resolve({
+      jsnext: true,
+      main: true,
+      browser: true
+    }),
+    commonjs()
+  ]
+};
diff --git a/tools/rollup.umd.js b/tools/rollup.umd.js
new file mode 100644
index 000000000..ba712c939
--- /dev/null
+++ b/tools/rollup.umd.js
@@ -0,0 +1,15 @@
+import babel from 'rollup-plugin-babel';
+import uglify from 'rollup-plugin-uglify';
+import config from './rollup.es';
+
+export default Object.assign({}, config, {
+  dest: 'dist/umd/index.js',
+  format: 'umd',
+  moduleName: 'casl',
+  plugins: config.plugins.concat([
+    babel({
+      exclude: 'node_modules/**'
+    }),
+    process.env.NODE_ENV === 'production' && uglify()
+  ])
+});