diff --git a/.gitignore b/.gitignore
index 3fc0f6b..9fb375a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -60,4 +60,5 @@ typings/
 dist
 demo/**/*.js
 demo/**/*.js.map
+npm-release
 
diff --git a/gulpfile.js b/gulpfile.js
index a089939..db05cbb 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -2,10 +2,20 @@ const del = require('del');
 const gulp = require('gulp');
 
 gulp.task('clean', function () {
-    return del('dist/**/*', { force: true });
+    return del(['dist/**/*']);
+});
+
+gulp.task('clean-npm', function () {
+    return del(['npm-release/**/*']);
 });
 
 gulp.task('rl', () => {
     gulp.src('./dist/browser-lib/*.js')
         .pipe(gulp.dest('./release'));
 });
+
+gulp.task('npmrl', () => {
+    gulp.src(['dist/**/*', '!dist/browser/**/*', '!dist/browser-lib/**/*', '!dist/demo/**/*', 'package.json',
+        'README.md', 'LICENSE'])
+        .pipe(gulp.dest('./npm-release'));
+})
diff --git a/package-lock.json b/package-lock.json
index 2ca3568..9fb3fd3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,290 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@firebase/app": {
+      "version": "0.1.10",
+      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.1.10.tgz",
+      "integrity": "sha512-2GTXt3b2QZXkmx6/5nNJq+pEN/VTjAG55MFJS1WMoLVZkwKuNpWNk65QVyPaoL88x1iHtuLqAMFgJUOnhOg+Pw==",
+      "dev": true,
+      "requires": {
+        "@firebase/app-types": "0.1.2",
+        "@firebase/util": "0.1.10",
+        "tslib": "1.9.0"
+      }
+    },
+    "@firebase/app-types": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.1.2.tgz",
+      "integrity": "sha512-bCIZGeMtP0ibrXNNaU214/1tRNw0jHnir/cfiAao1gjUyIS7RzOTQoH+zbwPJNEwUqJ0T3ykw/Tv4/khGqbVBg==",
+      "dev": true
+    },
+    "@firebase/database": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/@firebase/database/-/database-0.2.2.tgz",
+      "integrity": "sha512-iTNEN33D3V0hAG2hdx+guFBXaN4hcFS2k2EGp/bzNviAG7n2AotMscdbkS6xDS2e3Uk2/D3lfibHQO4zgJ3LIg==",
+      "dev": true,
+      "requires": {
+        "@firebase/database-types": "0.2.1",
+        "@firebase/logger": "0.1.1",
+        "@firebase/util": "0.1.11",
+        "faye-websocket": "0.11.1",
+        "tslib": "1.9.0"
+      },
+      "dependencies": {
+        "@firebase/util": {
+          "version": "0.1.11",
+          "resolved": "https://registry.npmjs.org/@firebase/util/-/util-0.1.11.tgz",
+          "integrity": "sha512-xUMugOJBSKVKOjrKJIVeIr4Z/6iDxSuOlOJRdz0xsOBJ9+lZVxGZs0U4oZmszWhQER1zzR+EQWIYFYePt6/QMQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "1.9.0"
+          }
+        },
+        "faye-websocket": {
+          "version": "0.11.1",
+          "resolved": "https://registry.npmjs.org/faye-websocket/-/faye-websocket-0.11.1.tgz",
+          "integrity": "sha1-8O/hjE9W5PQK/H4Gxxn9XuYYjzg=",
+          "dev": true,
+          "requires": {
+            "websocket-driver": "0.7.0"
+          }
+        }
+      }
+    },
+    "@firebase/database-types": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/@firebase/database-types/-/database-types-0.2.1.tgz",
+      "integrity": "sha512-LyvTpLImnhSTyHfPGcBxhD0tHw+R7FUb+als23Ad5hPCcGxlRgLhA+ukrhFIGA8Mt8FYHWgFm7TCX4YDRDxK6w==",
+      "dev": true
+    },
+    "@firebase/logger": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@firebase/logger/-/logger-0.1.1.tgz",
+      "integrity": "sha512-5jn3HHbEfdOwychyIEIkP1cik+MW/vvoOavTOzwDkH+fv6Bx+HBUOzh09M7sCYzXFtKzjbUax9+g39mJNBLklQ==",
+      "dev": true
+    },
+    "@firebase/util": {
+      "version": "0.1.10",
+      "resolved": "https://registry.npmjs.org/@firebase/util/-/util-0.1.10.tgz",
+      "integrity": "sha512-XEogRfUQBZ4T37TMq/3ZbuiTdRAKX8hF3TgJglUZNCJf/6QnQ+jlupCuMAXBqCGfw2Mw0m2matoCUBWpsyevOA==",
+      "dev": true,
+      "requires": {
+        "tslib": "1.9.0"
+      }
+    },
+    "@google-cloud/common": {
+      "version": "0.17.0",
+      "resolved": "https://registry.npmjs.org/@google-cloud/common/-/common-0.17.0.tgz",
+      "integrity": "sha512-HRZLSU762E6HaKoGfJGa8W95yRjb9rY7LePhjaHK9ILAnFacMuUGVamDbTHu1csZomm1g3tZTtXfX/aAhtie/Q==",
+      "dev": true,
+      "requires": {
+        "array-uniq": "1.0.3",
+        "arrify": "1.0.1",
+        "concat-stream": "1.6.2",
+        "create-error-class": "3.0.2",
+        "duplexify": "3.5.4",
+        "ent": "2.2.0",
+        "extend": "3.0.1",
+        "google-auto-auth": "0.10.1",
+        "is": "3.2.1",
+        "log-driver": "1.2.7",
+        "methmeth": "1.1.0",
+        "modelo": "4.2.3",
+        "request": "2.85.0",
+        "retry-request": "3.3.1",
+        "split-array-stream": "1.0.3",
+        "stream-events": "1.0.4",
+        "string-format-obj": "1.1.1",
+        "through2": "2.0.3"
+      }
+    },
+    "@google-cloud/common-grpc": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/@google-cloud/common-grpc/-/common-grpc-0.6.1.tgz",
+      "integrity": "sha512-pspOZVfmrCTP0svTNwFE8nYJsQp5rTUaeUpJwpgslDk5tDWFbYT3dZkANbiURcTSq0mo6hZmd+M5rPIzWMVUmA==",
+      "dev": true,
+      "requires": {
+        "@google-cloud/common": "0.17.0",
+        "dot-prop": "4.2.0",
+        "duplexify": "3.5.4",
+        "extend": "3.0.1",
+        "grpc": "1.10.1",
+        "is": "3.2.1",
+        "modelo": "4.2.3",
+        "retry-request": "3.3.1",
+        "through2": "2.0.3"
+      }
+    },
+    "@google-cloud/firestore": {
+      "version": "0.13.1",
+      "resolved": "https://registry.npmjs.org/@google-cloud/firestore/-/firestore-0.13.1.tgz",
+      "integrity": "sha512-70PPCDg++AGx4OGW/FhDoDtIh4Z2WuwPMkHkvFWNvEDGghCxGrYgRvpCsfcZBU0TLYpcbsndrweLp972cwItrQ==",
+      "dev": true,
+      "requires": {
+        "@google-cloud/common": "0.17.0",
+        "@google-cloud/common-grpc": "0.6.1",
+        "bun": "0.0.12",
+        "deep-equal": "1.0.1",
+        "extend": "3.0.1",
+        "functional-red-black-tree": "1.0.1",
+        "google-gax": "0.16.1",
+        "is": "3.2.1",
+        "safe-buffer": "5.1.1",
+        "through2": "2.0.3"
+      }
+    },
+    "@google-cloud/storage": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@google-cloud/storage/-/storage-1.6.0.tgz",
+      "integrity": "sha512-yQ63bJYoiwY220gn/KdTLPoHppAPwFHfG7VFLPwJ+1R5U1eqUN5XV2a7uPj1szGF8/gxlKm2UbE8DgoJJ76DFw==",
+      "dev": true,
+      "requires": {
+        "@google-cloud/common": "0.16.2",
+        "arrify": "1.0.1",
+        "async": "2.6.0",
+        "compressible": "2.0.13",
+        "concat-stream": "1.6.2",
+        "create-error-class": "3.0.2",
+        "duplexify": "3.5.4",
+        "extend": "3.0.1",
+        "gcs-resumable-upload": "0.9.0",
+        "hash-stream-validation": "0.2.1",
+        "is": "3.2.1",
+        "mime": "2.3.1",
+        "mime-types": "2.1.18",
+        "once": "1.4.0",
+        "pumpify": "1.4.0",
+        "request": "2.85.0",
+        "safe-buffer": "5.1.1",
+        "snakeize": "0.1.0",
+        "stream-events": "1.0.4",
+        "string-format-obj": "1.1.1",
+        "through2": "2.0.3"
+      },
+      "dependencies": {
+        "@google-cloud/common": {
+          "version": "0.16.2",
+          "resolved": "https://registry.npmjs.org/@google-cloud/common/-/common-0.16.2.tgz",
+          "integrity": "sha512-GrkaFoj0/oO36pNs4yLmaYhTujuA3i21FdQik99Fd/APix1uhf01VlpJY4lAteTDFLRNkRx6ydEh7OVvmeUHng==",
+          "dev": true,
+          "requires": {
+            "array-uniq": "1.0.3",
+            "arrify": "1.0.1",
+            "concat-stream": "1.6.2",
+            "create-error-class": "3.0.2",
+            "duplexify": "3.5.4",
+            "ent": "2.2.0",
+            "extend": "3.0.1",
+            "google-auto-auth": "0.9.7",
+            "is": "3.2.1",
+            "log-driver": "1.2.7",
+            "methmeth": "1.1.0",
+            "modelo": "4.2.3",
+            "request": "2.85.0",
+            "retry-request": "3.3.1",
+            "split-array-stream": "1.0.3",
+            "stream-events": "1.0.4",
+            "string-format-obj": "1.1.1",
+            "through2": "2.0.3"
+          }
+        },
+        "async": {
+          "version": "2.6.0",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
+          "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+          "dev": true,
+          "requires": {
+            "lodash": "4.17.5"
+          }
+        },
+        "google-auto-auth": {
+          "version": "0.9.7",
+          "resolved": "https://registry.npmjs.org/google-auto-auth/-/google-auto-auth-0.9.7.tgz",
+          "integrity": "sha512-Nro7aIFrL2NP0G7PoGrJqXGMZj8AjdBOcbZXRRm/8T3w08NUHIiNN3dxpuUYzDsZizslH+c8e+7HXL8vh3JXTQ==",
+          "dev": true,
+          "requires": {
+            "async": "2.6.0",
+            "gcp-metadata": "0.6.3",
+            "google-auth-library": "1.4.0",
+            "request": "2.85.0"
+          }
+        }
+      }
+    },
+    "@mrmlnc/readdir-enhanced": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
+      "integrity": "sha512-bPHp6Ji8b41szTOcaP63VlnbbO5Ny6dwAATtY6JTjh5N2OLrb5Qk/Th5cRkRQhkWCt+EJsYrNB0MiL+Gpn6e3g==",
+      "dev": true,
+      "requires": {
+        "call-me-maybe": "1.0.1",
+        "glob-to-regexp": "0.3.0"
+      }
+    },
+    "@protobufjs/aspromise": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/aspromise/-/aspromise-1.1.2.tgz",
+      "integrity": "sha1-m4sMxmPWaafY9vXQiToU00jzD78=",
+      "dev": true
+    },
+    "@protobufjs/base64": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/base64/-/base64-1.1.2.tgz",
+      "integrity": "sha512-AZkcAA5vnN/v4PDqKyMR5lx7hZttPDgClv83E//FMNhR2TMcLUhfRUBHCmSl0oi9zMgDDqRUJkSxO3wm85+XLg==",
+      "dev": true
+    },
+    "@protobufjs/codegen": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@protobufjs/codegen/-/codegen-2.0.4.tgz",
+      "integrity": "sha512-YyFaikqM5sH0ziFZCN3xDC7zeGaB/d0IUb9CATugHWbd1FRFwWwt4ld4OYMPWu5a3Xe01mGAULCdqhMlPl29Jg==",
+      "dev": true
+    },
+    "@protobufjs/eventemitter": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/eventemitter/-/eventemitter-1.1.0.tgz",
+      "integrity": "sha1-NVy8mLr61ZePntCV85diHx0Ga3A=",
+      "dev": true
+    },
+    "@protobufjs/fetch": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/fetch/-/fetch-1.1.0.tgz",
+      "integrity": "sha1-upn7WYYUr2VwDBYZ/wbUVLDYTEU=",
+      "dev": true,
+      "requires": {
+        "@protobufjs/aspromise": "1.1.2",
+        "@protobufjs/inquire": "1.1.0"
+      }
+    },
+    "@protobufjs/float": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/float/-/float-1.0.2.tgz",
+      "integrity": "sha1-Xp4avctz/Ap8uLKR33jIy9l7h9E=",
+      "dev": true
+    },
+    "@protobufjs/inquire": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/inquire/-/inquire-1.1.0.tgz",
+      "integrity": "sha1-/yAOPnzyQp4tyvwRQIKOjMY48Ik=",
+      "dev": true
+    },
+    "@protobufjs/path": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/path/-/path-1.1.2.tgz",
+      "integrity": "sha1-bMKyDFya1q0NzP0hynZz2Nf79o0=",
+      "dev": true
+    },
+    "@protobufjs/pool": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/pool/-/pool-1.1.0.tgz",
+      "integrity": "sha1-Cf0V8tbTq/qbZbw2ZQbWrXhG/1Q=",
+      "dev": true
+    },
+    "@protobufjs/utf8": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.0.tgz",
+      "integrity": "sha1-p3c2C1s5oaLlEG+OhY8v0tBgxXA=",
+      "dev": true
+    },
     "@sindresorhus/is": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.7.0.tgz",
@@ -42,6 +326,15 @@
         "@types/node": "9.6.5"
       }
     },
+    "@types/google-cloud__storage": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/@types/google-cloud__storage/-/google-cloud__storage-1.1.7.tgz",
+      "integrity": "sha512-010Llp+5ze+XWWmZuLDxs0pZgFjOgtJQVt9icJ0Ed67ZFLq7PnXkYx8x/k9nwDojR5/X4XoLPNqB1F627TScdQ==",
+      "dev": true,
+      "requires": {
+        "@types/node": "9.6.5"
+      }
+    },
     "@types/handlebars": {
       "version": "4.0.36",
       "resolved": "https://registry.npmjs.org/@types/handlebars/-/handlebars-4.0.36.tgz",
@@ -60,6 +353,12 @@
       "integrity": "sha512-ufQcVg4daO8xQ5kopxRHanqFdL4AI7ondQkV+2f+7mz3gvp0LkBx2zBRC6hfs3T87mzQFmf5Fck7Fi145Ul6NQ==",
       "dev": true
     },
+    "@types/long": {
+      "version": "3.0.32",
+      "resolved": "https://registry.npmjs.org/@types/long/-/long-3.0.32.tgz",
+      "integrity": "sha512-ZXyOOm83p7X8p3s0IYM3VeueNmHpkk/yMlP8CLeOnEcu6hIwPH7YjZBvhQkR0ZFS2DqZAxKtJ/M5fcuv3OU5BA==",
+      "dev": true
+    },
     "@types/marked": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/@types/marked/-/marked-0.3.0.tgz",
@@ -112,6 +411,12 @@
         "acorn": "5.5.3"
       }
     },
+    "acorn-es7-plugin": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/acorn-es7-plugin/-/acorn-es7-plugin-1.1.7.tgz",
+      "integrity": "sha1-8u4fMiipDurRJF+asZIusucdM2s=",
+      "dev": true
+    },
     "ajv": {
       "version": "6.4.0",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.4.0.tgz",
@@ -241,6 +546,12 @@
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
       "dev": true
     },
+    "array-filter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-1.0.0.tgz",
+      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM=",
+      "dev": true
+    },
     "array-slice": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
@@ -274,6 +585,16 @@
       "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
       "dev": true
     },
+    "ascli": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/ascli/-/ascli-1.0.1.tgz",
+      "integrity": "sha1-vPpZdKYvGOgcq660lzKrSoj5Brw=",
+      "dev": true,
+      "requires": {
+        "colour": "0.7.1",
+        "optjs": "3.2.2"
+      }
+    },
     "asn1": {
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
@@ -360,6 +681,16 @@
       "integrity": "sha512-32NDda82rhwD9/JBCCkB+MRYDp0oSvlo2IL6rQWA10PQi7tDUM3eqMSltXmY+Oyl/7N3P3qNtAlv7X0d9bI28w==",
       "dev": true
     },
+    "axios": {
+      "version": "0.18.0",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.0.tgz",
+      "integrity": "sha1-MtU+SFHv3AoRmTts0AB4nXDAUQI=",
+      "dev": true,
+      "requires": {
+        "follow-redirects": "1.4.1",
+        "is-buffer": "1.1.6"
+      }
+    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -1330,6 +1661,12 @@
       "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw==",
       "dev": true
     },
+    "base64url": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64url/-/base64url-2.0.0.tgz",
+      "integrity": "sha1-6sFuA+oUOO/5Qj1puqNiYu0fcLs=",
+      "dev": true
+    },
     "bcrypt-pbkdf": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
@@ -1531,6 +1868,18 @@
         }
       }
     },
+    "buffer-equal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-equal/-/buffer-equal-1.0.0.tgz",
+      "integrity": "sha1-WWFrSYME1Var1GaWayLu2j7KX74=",
+      "dev": true
+    },
+    "buffer-equal-constant-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
+      "integrity": "sha1-+OcRMvf/5uAaXJaXpMbz5I1cyBk=",
+      "dev": true
+    },
     "buffer-from": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.0.0.tgz",
@@ -1555,6 +1904,24 @@
       "integrity": "sha1-hZgoeOIbmOHGZCXgPQF0eI9Wnug=",
       "dev": true
     },
+    "bun": {
+      "version": "0.0.12",
+      "resolved": "https://registry.npmjs.org/bun/-/bun-0.0.12.tgz",
+      "integrity": "sha512-Toms18J9DqnT+IfWkwxVTB2EaBprHvjlMWrTIsfX4xbu3ZBqVBwrERU0em1IgtRe04wT+wJxMlKHZok24hrcSQ==",
+      "dev": true,
+      "requires": {
+        "readable-stream": "1.0.34"
+      }
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-      "integrity": "sha512-dehLu9eRRoV4l09aC+ySntRw1OAfoyKdbk8Nelblj03tHoynkSybqyEpgavemi1LBOH6S1vzI58/mpxkZIe1iQ==",
-      "dev": true,
-      "requires": {
-        "uglify-es": "3.3.9"
-      },
-      "dependencies": {
-        "commander": {
-          "version": "2.13.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.13.0.tgz",
-          "integrity": "sha512-MVuS359B+YzaWqjCL/c+22gfryv+mCBPHAv3zyVI2GN8EY6IRP8VwtasXn8jyyhvvq84R4ImN1OKRtcbIasjYA==",
-          "dev": true
-        },
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        },
-        "uglify-es": {
-          "version": "3.3.9",
-          "resolved": "https://registry.npmjs.org/uglify-es/-/uglify-es-3.3.9.tgz",
-          "integrity": "sha512-r+MU0rfv4L/0eeW3xZrd16t4NZfK8Ld4SWVglYBb7ez5uXFWHuVRs6xCTrf1yirs9a4j4Y27nn7SRfO6v67XsQ==",
-          "dev": true,
-          "requires": {
-            "commander": "2.13.0",
-            "source-map": "0.6.1"
-          }
-        }
-      }
-    },
-    "rollup-pluginutils": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-1.5.2.tgz",
-      "integrity": "sha1-HhVud4+UtyVb+hs9AXi+j1xVJAg=",
-      "dev": true,
-      "requires": {
-        "estree-walker": "0.2.1",
-        "minimatch": "3.0.4"
-      }
-    },
     "run-async": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
@@ -8450,6 +10352,12 @@
       "integrity": "sha1-VusCfWW00tzmyy4tMsTUr8nh1wc=",
       "dev": true
     },
+    "snakeize": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/snakeize/-/snakeize-0.1.0.tgz",
+      "integrity": "sha1-EMCI2LWOsHazIpu1oE4jLOEmQi0=",
+      "dev": true
+    },
     "snapdragon": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/snapdragon/-/snapdragon-0.8.2.tgz",
@@ -8674,6 +10582,27 @@
       "integrity": "sha512-2+EPwgbnmOIl8HjGBXXMd9NAu02vLjOO1nWw4kmeRDFyHn+M/ETfHxQUK0oXg8ctgVnl9t3rosNVsZ1jG61nDA==",
       "dev": true
     },
+    "split-array-stream": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/split-array-stream/-/split-array-stream-1.0.3.tgz",
+      "integrity": "sha1-0rdajl4Ngk1S/eyLgiWDncLjXfo=",
+      "dev": true,
+      "requires": {
+        "async": "2.6.0",
+        "is-stream-ended": "0.1.4"
+      },
+      "dependencies": {
+        "async": {
+          "version": "2.6.0",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
+          "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+          "dev": true,
+          "requires": {
+            "lodash": "4.17.5"
+          }
+        }
+      }
+    },
     "split-string": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
@@ -8787,6 +10716,15 @@
         "stream-shift": "1.0.0"
       }
     },
+    "stream-events": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.4.tgz",
+      "integrity": "sha512-D243NJaYs/xBN2QnoiMDY7IesJFIK7gEhnvAYqJa5JvDdnh2dC4qDBwlCf0ohPpX2QRlA/4gnbnPd3rs3KxVcA==",
+      "dev": true,
+      "requires": {
+        "stubs": "3.0.0"
+      }
+    },
     "stream-http": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/stream-http/-/stream-http-2.8.1.tgz",
@@ -8853,6 +10791,12 @@
       "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM=",
       "dev": true
     },
+    "string-format-obj": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string-format-obj/-/string-format-obj-1.1.1.tgz",
+      "integrity": "sha512-Mm+sROy+pHJmx0P/0Bs1uxIX6UhGJGj6xDGQZ5zh9v/SZRmLGevp+p0VJxV7lirrkAmQ2mvva/gHKpnF/pTb+Q==",
+      "dev": true
+    },
     "string-template": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/string-template/-/string-template-0.2.1.tgz",
@@ -8892,6 +10836,17 @@
       "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
       "dev": true
     },
+    "stringifier": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/stringifier/-/stringifier-1.3.0.tgz",
+      "integrity": "sha1-3vGDQvaTPbDy2/yaoCF1tEjBeVk=",
+      "dev": true,
+      "requires": {
+        "core-js": "2.5.5",
+        "traverse": "0.6.6",
+        "type-name": "2.0.2"
+      }
+    },
     "stringstream": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
@@ -8983,6 +10938,12 @@
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
+    "stubs": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
+      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls=",
+      "dev": true
+    },
     "supports-color": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.4.0.tgz",
@@ -9187,6 +11148,12 @@
         }
       }
     },
+    "traverse": {
+      "version": "0.6.6",
+      "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.6.6.tgz",
+      "integrity": "sha1-y99WD9e5r2MlAv7UD5GMFX6pcTc=",
+      "dev": true
+    },
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
@@ -9250,6 +11217,12 @@
       "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
+    "type-name": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/type-name/-/type-name-2.0.2.tgz",
+      "integrity": "sha1-7+fUEj2KxSr/9/QMfk3sUmYAj7Q=",
+      "dev": true
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -9440,6 +11413,26 @@
       "integrity": "sha1-1ZpKdUJ0R9mqbJHnAmP40mpLEEs=",
       "dev": true
     },
+    "unique-string": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
+      "integrity": "sha1-nhBXzKhRq7kzmPizOuGHuZyuwRo=",
+      "dev": true,
+      "requires": {
+        "crypto-random-string": "1.0.0"
+      }
+    },
+    "universal-deep-strict-equal": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/universal-deep-strict-equal/-/universal-deep-strict-equal-1.2.2.tgz",
+      "integrity": "sha1-DaSsL3PP95JMgfpN4BjKViyisKc=",
+      "dev": true,
+      "requires": {
+        "array-filter": "1.0.0",
+        "indexof": "0.0.1",
+        "object-keys": "1.0.11"
+      }
+    },
     "universalify": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.1.tgz",
@@ -10115,6 +12108,22 @@
         }
       }
     },
+    "websocket-driver": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.0.tgz",
+      "integrity": "sha1-DK+dLXVdk67gSdS90NP+LMoqJOs=",
+      "dev": true,
+      "requires": {
+        "http-parser-js": "0.4.12",
+        "websocket-extensions": "0.1.3"
+      }
+    },
+    "websocket-extensions": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/websocket-extensions/-/websocket-extensions-0.1.3.tgz",
+      "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
+      "dev": true
+    },
     "which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
@@ -10134,8 +12143,7 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
       "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
-      "dev": true,
-      "optional": true
+      "dev": true
     },
     "wordwrap": {
       "version": "0.0.3",
@@ -10201,6 +12209,12 @@
         "slide": "1.1.6"
       }
     },
+    "xdg-basedir": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
+      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
@@ -10224,7 +12238,6 @@
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
       "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
       "dev": true,
-      "optional": true,
       "requires": {
         "camelcase": "1.2.1",
         "cliui": "2.1.0",
diff --git a/package.json b/package.json
index c573d19..26e026f 100644
--- a/package.json
+++ b/package.json
@@ -7,13 +7,20 @@
     "test": "mocha -r ts-node/register test/*.ts",
     "demo": "tsc --sourceMap demo/typescript/index.ts",
     "clean": "gulp clean",
-    "browser": "webpack -p && gulp rl"
+    "browser": "webpack -p && gulp rl",
+    "lib": "gulp clean-npm && gulp npmrl"
   },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/jinhduong/linq-fns.git"
   },
-  "keywords": [],
+  "keywords": [
+    "linq-fns",
+    "jslinq",
+    "js-linq",
+    "javascript linq",
+    "ts-linq"
+  ],
   "author": "",
   "license": "ISC",
   "bugs": {
@@ -27,6 +34,7 @@
     "chai": "^4.1.2",
     "console.table": "^0.10.0",
     "del": "^3.0.0",
+    "firebase-admin": "^5.12.0",
     "gulp": "^3.9.1",
     "html-webpack-plugin": "^3.2.0",
     "mocha": "^5.1.1",
diff --git a/src/drivers/database.interface.ts b/src/drivers/database.interface.ts
new file mode 100644
index 0000000..2552811
--- /dev/null
+++ b/src/drivers/database.interface.ts
@@ -0,0 +1,593 @@
+/*! firebase-admin v5.12.0 */
+/*!
+ * Copyright 2017 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Bucket } from '@google-cloud/storage';
+import * as _firestore from '@google-cloud/firestore';
+
+declare namespace admin {
+    interface FirebaseError {
+        code: string;
+        message: string;
+        stack: string;
+
+        toJSON(): Object;
+    }
+
+    type FirebaseArrayIndexError = {
+        index: number;
+        error: FirebaseError;
+    }
+
+    interface ServiceAccount {
+        projectId?: string;
+        clientEmail?: string;
+        privateKey?: string;
+    }
+
+    interface GoogleOAuthAccessToken {
+        access_token: string;
+        expires_in: number;
+    }
+
+    interface AppOptions {
+        credential?: admin.credential.Credential;
+        databaseAuthVariableOverride?: Object;
+        databaseURL?: string;
+        storageBucket?: string;
+        projectId?: string;
+    }
+
+    var SDK_VERSION: string;
+    var apps: (admin.app.App | null)[];
+
+    function app(name?: string): admin.app.App;
+    function auth(app?: admin.app.App): admin.auth.Auth;
+    function database(app?: admin.app.App): admin.database.Database;
+    function messaging(app?: admin.app.App): admin.messaging.Messaging;
+    function storage(app?: admin.app.App): admin.storage.Storage;
+    function firestore(app?: admin.app.App): admin.firestore.Firestore;
+    function instanceId(app?: admin.app.App): admin.instanceId.InstanceId;
+    function initializeApp(options?: admin.AppOptions, name?: string): admin.app.App;
+}
+
+declare namespace admin.app {
+    interface App {
+        name: string;
+        options: admin.AppOptions;
+
+        auth(): admin.auth.Auth;
+        database(url?: string): admin.database.Database;
+        firestore(): admin.firestore.Firestore;
+        instanceId(): admin.instanceId.InstanceId;
+        messaging(): admin.messaging.Messaging;
+        storage(): admin.storage.Storage;
+        delete(): Promise<void>;
+    }
+}
+
+declare namespace admin.auth {
+    interface UserMetadata {
+        lastSignInTime: string;
+        creationTime: string;
+
+        toJSON(): Object;
+    }
+
+    interface UserInfo {
+        uid: string;
+        displayName: string;
+        email: string;
+        phoneNumber: string;
+        photoURL: string;
+        providerId: string;
+
+        toJSON(): Object;
+    }
+
+    interface UserRecord {
+        uid: string;
+        email: string;
+        emailVerified: boolean;
+        displayName: string;
+        phoneNumber: string;
+        photoURL: string;
+        disabled: boolean;
+        metadata: admin.auth.UserMetadata;
+        providerData: admin.auth.UserInfo[];
+        passwordHash?: string;
+        passwordSalt?: string;
+        customClaims?: Object;
+        tokensValidAfterTime?: string;
+
+        toJSON(): Object;
+    }
+
+    interface UpdateRequest {
+        displayName?: string;
+        email?: string;
+        emailVerified?: boolean;
+        phoneNumber?: string;
+        photoURL?: string;
+        disabled?: boolean;
+        password?: string;
+    }
+
+    interface CreateRequest extends UpdateRequest {
+        uid?: string;
+    }
+
+    interface DecodedIdToken {
+        aud: string;
+        auth_time: number;
+        exp: number;
+        firebase: {
+            identities: {
+                [key: string]: any;
+            };
+            sign_in_provider: string;
+            [key: string]: any;
+        };
+        iat: number;
+        iss: string;
+        sub: string;
+        uid: string;
+        [key: string]: any;
+    }
+
+    interface ListUsersResult {
+        users: admin.auth.UserRecord[];
+        pageToken?: string;
+    }
+
+    type HashAlgorithmType = 'SCRYPT' | 'STANDARD_SCRYPT' | 'HMAC_SHA512' |
+        'HMAC_SHA256' | 'HMAC_SHA1' | 'HMAC_MD5' | 'MD5' | 'PBKDF_SHA1' | 'BCRYPT' |
+        'PBKDF2_SHA256' | 'SHA512' | 'SHA256' | 'SHA1';
+
+
+    interface UserImportOptions {
+        hash: {
+            algorithm: HashAlgorithmType;
+            key?: Buffer;
+            saltSeparator?: string;
+            rounds?: number;
+            memoryCost?: number;
+            parallelization?: number;
+            blockSize?: number;
+            derivedKeyLength?: number;
+        };
+    }
+
+    interface UserImportResult {
+        failureCount: number;
+        successCount: number;
+        errors: admin.FirebaseArrayIndexError[];
+    }
+
+    interface UserImportRecord {
+        uid: string;
+        email?: string;
+        emailVerified?: boolean;
+        displayName?: string;
+        phoneNumber?: string;
+        photoURL?: string;
+        disabled?: boolean;
+        metadata?: {
+            lastSignInTime?: string;
+            creationTime?: string;
+        };
+        providerData?: {
+            uid: string,
+            displayName?: string,
+            email?: string,
+            photoURL?: string,
+            providerId: string,
+        }[];
+        customClaims?: Object;
+        passwordHash?: Buffer;
+        passwordSalt?: Buffer;
+    }
+
+    interface SessionCookieOptions {
+        expiresIn: number;
+    }
+
+    interface Auth {
+        app: admin.app.App;
+
+        createCustomToken(uid: string, developerClaims?: Object): Promise<string>;
+        createUser(properties: admin.auth.CreateRequest): Promise<admin.auth.UserRecord>;
+        deleteUser(uid: string): Promise<void>;
+        getUser(uid: string): Promise<admin.auth.UserRecord>;
+        getUserByEmail(email: string): Promise<admin.auth.UserRecord>;
+        getUserByPhoneNumber(phoneNumber: string): Promise<admin.auth.UserRecord>;
+        listUsers(maxResults?: number, pageToken?: string): Promise<admin.auth.ListUsersResult>;
+        updateUser(uid: string, properties: admin.auth.UpdateRequest): Promise<admin.auth.UserRecord>;
+        verifyIdToken(idToken: string, checkRevoked?: boolean): Promise<admin.auth.DecodedIdToken>;
+        setCustomUserClaims(uid: string, customUserClaims: Object): Promise<void>;
+        revokeRefreshTokens(uid: string): Promise<void>;
+        importUsers(
+            users: admin.auth.UserImportRecord[],
+            options?: admin.auth.UserImportOptions,
+        ): Promise<admin.auth.UserImportResult>
+        createSessionCookie(
+            idToken: string,
+            sessionCookieOptions: admin.auth.SessionCookieOptions,
+        ): Promise<string>;
+        verifySessionCookie(
+            sessionCookie: string,
+            checkForRevocation?: boolean,
+        ): Promise<admin.auth.DecodedIdToken>;
+    }
+}
+
+declare namespace admin.credential {
+    interface Credential {
+        getAccessToken(): Promise<admin.GoogleOAuthAccessToken>;
+    }
+
+    function applicationDefault(): admin.credential.Credential;
+    function cert(serviceAccountPathOrObject: string | admin.ServiceAccount): admin.credential.Credential;
+    function refreshToken(refreshTokenPathOrObject: string | Object): admin.credential.Credential;
+}
+
+declare namespace admin.database {
+    interface Database {
+        app: admin.app.App;
+
+        goOffline(): void;
+        goOnline(): void;
+        ref(path?: string | admin.database.Reference): admin.database.Reference;
+        refFromURL(url: string): admin.database.Reference;
+    }
+
+    interface DataSnapshot {
+        key: string | null;
+        ref: admin.database.Reference;
+
+        child(path: string): admin.database.DataSnapshot;
+        exists(): boolean;
+        exportVal(): any;
+        forEach(action: (a: admin.database.DataSnapshot) => boolean): boolean;
+        getPriority(): string | number | null;
+        hasChild(path: string): boolean;
+        hasChildren(): boolean;
+        numChildren(): number;
+        toJSON(): Object | null;
+        val(): any;
+    }
+
+    interface OnDisconnect {
+        cancel(onComplete?: (a: Error | null) => any): Promise<void>;
+        remove(onComplete?: (a: Error | null) => any): Promise<void>;
+        set(value: any, onComplete?: (a: Error | null) => any): Promise<void>;
+        setWithPriority(
+            value: any,
+            priority: number | string | null,
+            onComplete?: (a: Error | null) => any
+        ): Promise<void>;
+        update(values: Object, onComplete?: (a: Error | null) => any): Promise<void>;
+    }
+
+    type EventType = 'value' | 'child_added' | 'child_changed' | 'child_moved' | 'child_removed';
+
+    interface Query {
+        ref: admin.database.Reference;
+
+        endAt(value: number | string | boolean | null, key?: string): admin.database.Query;
+        equalTo(value: number | string | boolean | null, key?: string): admin.database.Query;
+        isEqual(other: admin.database.Query | null): boolean;
+        limitToFirst(limit: number): admin.database.Query;
+        limitToLast(limit: number): admin.database.Query;
+        off(
+            eventType?: admin.database.EventType,
+            callback?: (a: admin.database.DataSnapshot, b?: string | null) => any,
+            context?: Object | null
+        ): void;
+        on(
+            eventType: admin.database.EventType,
+            callback: (a: admin.database.DataSnapshot | null, b?: string) => any,
+            cancelCallbackOrContext?: Object | null,
+            context?: Object | null
+        ): (a: admin.database.DataSnapshot | null, b?: string) => any;
+        once(
+            eventType: admin.database.EventType,
+            successCallback?: (a: admin.database.DataSnapshot, b?: string) => any,
+            failureCallbackOrContext?: Object | null,
+            context?: Object | null
+        ): Promise<any>;
+        orderByChild(path: string): admin.database.Query;
+        orderByKey(): admin.database.Query;
+        orderByPriority(): admin.database.Query;
+        orderByValue(): admin.database.Query;
+        startAt(value: number | string | boolean | null, key?: string): admin.database.Query;
+        toJSON(): Object;
+        toString(): string;
+    }
+
+    interface Reference extends admin.database.Query {
+        key: string | null;
+        parent: admin.database.Reference | null;
+        root: admin.database.Reference;
+        path: string;
+
+        child(path: string): admin.database.Reference;
+        onDisconnect(): admin.database.OnDisconnect;
+        push(value?: any, onComplete?: (a: Error | null) => any): admin.database.ThenableReference;
+        remove(onComplete?: (a: Error | null) => any): Promise<void>;
+        set(value: any, onComplete?: (a: Error | null) => any): Promise<void>;
+        setPriority(
+            priority: string | number | null,
+            onComplete: (a: Error | null) => any
+        ): Promise<void>;
+        setWithPriority(
+            newVal: any, newPriority: string | number | null,
+            onComplete?: (a: Error | null) => any
+        ): Promise<void>;
+        transaction(
+            transactionUpdate: (a: any) => any,
+            onComplete?: (a: Error | null, b: boolean, c: admin.database.DataSnapshot | null) => any,
+            applyLocally?: boolean
+        ): Promise<{
+            committed: boolean,
+            snapshot: admin.database.DataSnapshot | null
+        }>;
+        update(values: Object, onComplete?: (a: Error | null) => any): Promise<void>;
+    }
+
+    interface ThenableReference extends admin.database.Reference, PromiseLike<any> { }
+
+    function enableLogging(logger?: boolean | ((message: string) => any), persistent?: boolean): any;
+}
+
+declare namespace admin.database.ServerValue {
+    var TIMESTAMP: number;
+}
+
+type BaseMessage = {
+    data?: { [key: string]: string };
+    notification?: admin.messaging.Notification;
+    android?: admin.messaging.AndroidConfig;
+    webpush?: admin.messaging.WebpushConfig;
+    apns?: admin.messaging.ApnsConfig;
+};
+
+interface TokenMessage extends BaseMessage {
+    token: string;
+}
+
+interface TopicMessage extends BaseMessage {
+    topic: string;
+}
+
+interface ConditionMessage extends BaseMessage {
+    condition: string;
+}
+
+declare namespace admin.messaging {
+    type Message = any;
+
+    type AndroidConfig = {
+        collapseKey?: string;
+        priority?: ('high' | 'normal');
+        ttl?: number;
+        restrictedPackageName?: string;
+        data?: { [key: string]: string };
+        notification?: AndroidNotification;
+    };
+
+    type AndroidNotification = {
+        title?: string;
+        body?: string;
+        icon?: string;
+        color?: string;
+        sound?: string;
+        tag?: string;
+        clickAction?: string;
+        bodyLocKey?: string;
+        bodyLocArgs?: string[];
+        titleLocKey?: string;
+        titleLocArgs?: string[];
+    };
+
+    type ApnsConfig = {
+        headers?: { [key: string]: string };
+        payload?: ApnsPayload;
+    };
+
+    type ApnsPayload = {
+        aps: Aps;
+        [customData: string]: object;
+    };
+
+    type Aps = {
+        alert?: string | ApsAlert;
+        badge?: number;
+        sound?: string;
+        contentAvailable?: boolean;
+        mutableContent?: boolean;
+        category?: string;
+        threadId?: string;
+        [customData: string]: any;
+    };
+
+    type ApsAlert = {
+        title?: string;
+        body?: string;
+        locKey?: string;
+        locArgs?: string[];
+        titleLocKey?: string;
+        titleLocArgs?: string[];
+        actionLocKey?: string;
+        launchImage?: string;
+    };
+
+    type Notification = {
+        title?: string;
+        body?: string;
+    };
+
+    type WebpushConfig = {
+        headers?: { [key: string]: string };
+        data?: { [key: string]: string };
+        notification?: WebpushNotification;
+    };
+
+    type WebpushNotification = {
+        title?: string;
+        body?: string;
+        icon?: string;
+    };
+
+    type DataMessagePayload = {
+        [key: string]: string;
+    };
+
+    type NotificationMessagePayload = {
+        tag?: string;
+        body?: string;
+        icon?: string;
+        badge?: string;
+        color?: string;
+        sound?: string;
+        title?: string;
+        bodyLocKey?: string;
+        bodyLocArgs?: string;
+        clickAction?: string;
+        titleLocKey?: string;
+        titleLocArgs?: string;
+        [key: string]: string | undefined;
+    };
+
+    type MessagingPayload = {
+        data?: admin.messaging.DataMessagePayload;
+        notification?: admin.messaging.NotificationMessagePayload;
+    };
+
+    type MessagingOptions = {
+        dryRun?: boolean;
+        priority?: string;
+        timeToLive?: number;
+        collapseKey?: string;
+        mutableContent?: boolean;
+        contentAvailable?: boolean;
+        restrictedPackageName?: string;
+        [key: string]: any | undefined;
+    };
+
+    type MessagingDeviceResult = {
+        error?: admin.FirebaseError;
+        messageId?: string;
+        canonicalRegistrationToken?: string;
+    };
+
+    type MessagingDevicesResponse = {
+        canonicalRegistrationTokenCount: number;
+        failureCount: number;
+        multicastId: number;
+        results: admin.messaging.MessagingDeviceResult[];
+        successCount: number;
+    };
+
+    type MessagingDeviceGroupResponse = {
+        successCount: number;
+        failureCount: number;
+        failedRegistrationTokens: string[];
+    };
+
+    type MessagingTopicResponse = {
+        messageId: number;
+    };
+
+    type MessagingConditionResponse = {
+        messageId: number;
+    };
+
+    type MessagingTopicManagementResponse = {
+        failureCount: number;
+        successCount: number;
+        errors: admin.FirebaseArrayIndexError[];
+    };
+
+    interface Messaging {
+        app: admin.app.App;
+
+        send(message: admin.messaging.Message, dryRun?: boolean): Promise<string>;
+        sendToDevice(
+            registrationToken: string | string[],
+            payload: admin.messaging.MessagingPayload,
+            options?: admin.messaging.MessagingOptions
+        ): Promise<admin.messaging.MessagingDevicesResponse>;
+        sendToDeviceGroup(
+            notificationKey: string,
+            payload: admin.messaging.MessagingPayload,
+            options?: admin.messaging.MessagingOptions
+        ): Promise<admin.messaging.MessagingDeviceGroupResponse>;
+        sendToTopic(
+            topic: string,
+            payload: admin.messaging.MessagingPayload,
+            options?: admin.messaging.MessagingOptions
+        ): Promise<admin.messaging.MessagingTopicResponse>;
+        sendToCondition(
+            condition: string,
+            payload: admin.messaging.MessagingPayload,
+            options?: admin.messaging.MessagingOptions
+        ): Promise<admin.messaging.MessagingConditionResponse>;
+        subscribeToTopic(
+            registrationToken: string,
+            topic: string
+        ): Promise<admin.messaging.MessagingTopicManagementResponse>;
+        subscribeToTopic(
+            registrationTokens: string[],
+            topic: string
+        ): Promise<admin.messaging.MessagingTopicManagementResponse>;
+        unsubscribeFromTopic(
+            registrationToken: string,
+            topic: string
+        ): Promise<admin.messaging.MessagingTopicManagementResponse>;
+        unsubscribeFromTopic(
+            registrationTokens: string[],
+            topic: string
+        ): Promise<admin.messaging.MessagingTopicManagementResponse>;
+    }
+}
+
+declare namespace admin.storage {
+    interface Storage {
+        app: admin.app.App;
+        bucket(name?: string): Bucket;
+    }
+}
+
+declare namespace admin.firestore {
+    export import DocumentReference = _firestore.DocumentReference;
+    export import DocumentSnapshot = _firestore.DocumentSnapshot;
+    export import FieldPath = _firestore.FieldPath;
+    export import FieldValue = _firestore.FieldValue;
+    export import Firestore = _firestore.Firestore;
+    export import GeoPoint = _firestore.GeoPoint;
+    export import setLogFunction = _firestore.setLogFunction;
+}
+
+declare namespace admin.instanceId {
+    interface InstanceId {
+        app: admin.app.App;
+
+        deleteInstanceId(instanceId: string): Promise<void>;
+    }
+}
+
+export = admin;
diff --git a/src/drivers/index.ts b/src/drivers/index.ts
new file mode 100644
index 0000000..d002548
--- /dev/null
+++ b/src/drivers/index.ts
@@ -0,0 +1 @@
+export * from './linq-fns-firebase';
\ No newline at end of file
diff --git a/src/drivers/linq-fns-firebase.ts b/src/drivers/linq-fns-firebase.ts
new file mode 100644
index 0000000..f4c1509
--- /dev/null
+++ b/src/drivers/linq-fns-firebase.ts
@@ -0,0 +1,56 @@
+import { database } from './database.interface';
+import { Queryable } from '..';
+import { IMethods } from '../intefaces';
+
+const admin = require('firebase-admin');
+
+export class FireBaseQueryale {
+    _db: database.Database;
+
+    constructor(db: database.Database) {
+        this._db = db;
+    }
+
+    getQuery<T>(name: string, limitType?: 'first' | 'last', limit?: number): IMethods<T> {
+        const promise = this.getPromiseSource(name, limitType, limit);
+        return Queryable.from(promise) as IMethods<T>;
+    }
+
+    getPromiseSource<T>(name: string, limitType?: 'first' | 'last', limit?: number): Promise<T[]> {
+        let _methodName = (limitType === 'first' ? 'limitToFirst' : 'limitToLast');
+        const ref = this.getRefObject(name);
+        const promise: Promise<T[]> = new Promise((resolve, reject) => {
+            (limitType ? ref[_methodName](limit) : ref)['on']('value', (snapshot) => {
+                const _data: Object = snapshot.val();
+                if (!_data)
+                    return resolve([]);
+                const _arrayedData = Object.keys(_data).map(prop => {
+                    _data[prop]['__id'] = prop;
+                    return _data[prop];
+                });
+                resolve(_arrayedData);
+            });
+        });
+        return promise;
+    }
+
+    private getRefObject(name: string): database.Reference {
+        if (!name) throw new Error(`name cannot empty`);
+
+        const arr = name.split('.');
+        let _refs: database.Reference[] = [];
+
+        try {
+
+            for (let i = 0, li = arr.length; i < li; i++) {
+                i === 0 ? _refs.push(this._db.ref(arr[i])) : _refs.push(_refs[i - 1].child(arr[i]));
+            }
+
+            return _refs[_refs.length - 1];
+
+        } catch (err) {
+            throw new Error(err);
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/implements/methods.ts b/src/implements/methods.ts
index 389ba4e..e5685c8 100644
--- a/src/implements/methods.ts
+++ b/src/implements/methods.ts
@@ -272,28 +272,26 @@ export class IteratorMethods<T> implements IMethods<T> {
         else
             _promises.unshift(Promise.resolve(this._source));
 
-        return new Promise(resolve => {
-            Promise.all(_promises).then((responseDatas: any[]) => {
+        return Promise.all(_promises).then((responseDatas: any[]) => {
 
-                let _index = 0;
-                _result = responseDatas[0]; // Set from method's source
+            let _index = 0;
+            _result = responseDatas[0]; // Set from method's source
 
-                for (let i = 0, li = this._iteratorCollection.length; i < li; i++) {
+            for (let i = 0, li = this._iteratorCollection.length; i < li; i++) {
 
-                    let _iterator = this._iteratorCollection[i];
+                let _iterator = this._iteratorCollection[i];
 
-                    if (_iterator.hasSource()) {
-                        _iterator.replaceBySyncSource(responseDatas[_index + 1]);
-                        _index += 1;
-                    }
+                if (_iterator.hasSource()) {
+                    _iterator.replaceBySyncSource(responseDatas[_index + 1]);
+                    _index += 1;
                 }
+            }
 
-                this._iteratorCollection.forEach((ite: IIterator<T>) => {
-                    _result = ite.execute(_result) as T[];
-                });
-
-                resolve(_result);
+            this._iteratorCollection.forEach((ite: IIterator<T>) => {
+                _result = ite.execute(_result) as T[];
             });
+
+            return _result;
         });
     }
 }
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index 926cb3a..a9bef5e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1,2 @@
-export { Queryable } from './implements/queryable';
\ No newline at end of file
+export { Queryable } from './implements/queryable';
+export { FireBaseQueryale } from './drivers';
\ No newline at end of file
diff --git a/src/intefaces/methods.interface.ts b/src/intefaces/methods.interface.ts
index ee3229d..6385184 100644
--- a/src/intefaces/methods.interface.ts
+++ b/src/intefaces/methods.interface.ts
@@ -24,7 +24,7 @@ export interface IMethods<T> {
     zip<S>(another: S[] | Promise<S[]>, iterator?: (item1: T, item2: S) => any): IMethods<[T | S] | any>
 
     // Execute methods
-    toList<S extends T>(): Promise<S[]>;
+    toList<S extends T>(): Promise<S[]| S[]>;
 
     sum<S>(iterator: (entity: T) => S): Promise<number>;
     min<S>(iterator: (entity: T) => S): Promise<number>;
diff --git a/tsconfig.json b/tsconfig.json
index 89c1bee..93ca402 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -23,7 +23,7 @@
             ]
         },
         "baseUrl": "./",
-        // "declaration": true,
+        "declaration": true,
     },
     "exclude": [
         "demo",