diff --git a/package.json b/package.json
index a02d163e7..a627c02da 100644
--- a/package.json
+++ b/package.json
@@ -1,120 +1,111 @@
 {
-  "name": "mobx",
-  "version": "5.1.2",
-  "description": "Simple, scalable state management.",
-  "main": "lib/mobx.js",
-  "umd:main": "lib/mobx.umd.js",
-  "module": "lib/mobx.module.js",
-  "unpkg": "lib/mobx.umd.min.js",
-  "jsnext:main": "lib/mobx.module.js",
-  "react-native": "lib/mobx.module.js",
-  "typings": "lib/mobx.d.ts",
-  "scripts": {
-    "test": "yarn jest",
-    "watch": "yarn jest --watch",
-    "test:mixed-versions": "jest --testRegex mixed-versions",
-    "test:all": "yarn small-build && yarn jest -i && yarn test:flow && yarn test:mixed-versions",
-    "test:webpack": "node scripts/webpack-regression-tests.js",
-    "test:flow": "node_modules/.bin/flow check",
-    "test:performance": "npm run small-build && PERSIST=true time node --expose-gc test/perf/index.js",
-    "test:travis": "yarn test:all && yarn test:performance && yarn test -i --coverage && yarn test:webpack && yarn size",
-    "prettier": "prettier --write --print-width 100 --tab-width 4 --no-semi \"**/*.js\" \"**/*.jsx\" \"**/*.tsx\" \"**/*.ts\"",
-    "_prepublish": "npm run small-build",
-    "quick-build": "tsc --pretty",
-    "small-build": "node scripts/build.js",
-    "lint": "tslint -c tslint.json src/*.ts src/types/*.ts src/api/*.ts src/core/*.ts src/utils/*.ts",
-    "size": "size-limit --babili 20KB lib/mobx.js",
-    "precommit": "lint-staged"
-  },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/mobxjs/mobx.git"
-  },
-  "author": "Michel Weststrate",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/mobxjs/mobx/issues"
-  },
-  "files": [
-    "lib",
-    "LICENSE"
-  ],
-  "homepage": "https://mobx.js.org/",
-  "devDependencies": {
-    "@types/jest": "^21.1.9",
-    "@types/node": "^7.0.22",
-    "babel-core": "7.0.0-beta.3",
-    "babel-jest": "^23.6.0",
-    "babel-plugin-transform-regenerator": "^6.26.0",
-    "babel-preset-es2015": "7.0.0-beta.3",
-    "babel-preset-react": "7.0.0-beta.3",
-    "babel-preset-stage-1": "7.0.0-beta.3",
-    "browserify": "^12.0.1",
-    "chalk": "^1.1.3",
-    "coveralls": "^2.11.4",
-    "envify": "^4.1.0",
-    "flow-bin": "^0.59.0",
-    "fs-extra": "^3.0.1",
-    "husky": "^0.14.3",
-    "iterall": "^1.0.2",
-    "jest": "^23.6.0",
-    "lint-staged": "^3.6.1",
-    "lodash.intersection": "^3.2.0",
-    "ncp": "^2.0.0",
-    "nscript": "^0.1.10",
-    "prettier": "^1.4.4",
-    "regenerator-runtime": "^0.11.1",
-    "rollup": "^0.41.6",
-    "rollup-plugin-filesize": "^1.3.2",
-    "rollup-plugin-node-resolve": "^3.0.0",
-    "serializr": "^1.3.0",
-    "size-limit": "^0.2.0",
-    "tape": "^4.2.2",
-    "ts-jest": "^22.0.0",
-    "tslib": "^1.7.1",
-    "typescript": "^2.9.0",
-    "uglify-es": "^3.3.9"
-  },
-  "dependencies": {},
-  "keywords": [
-    "mobx",
-    "mobservable",
-    "observable",
-    "react-component",
-    "react",
-    "reactjs",
-    "reactive",
-    "model",
-    "frp",
-    "functional-reactive-programming",
-    "state management",
-    "data flow"
-  ],
-  "lint-staged": {
-    "*.{ts,tsx,js,jsx}": [
-      "prettier --write --print-width 100 --tab-width 4 --no-semi",
-      "git add"
-    ]
-  },
-  "jest": {
-    "transform": {
-      "^.+\\.tsx?$": "ts-jest",
-      "^.+\\.jsx?$": "babel-jest"
+    "name": "mobx",
+    "version": "5.1.2",
+    "description": "Simple, scalable state management.",
+    "main": "lib/mobx.js",
+    "umd:main": "lib/mobx.umd.js",
+    "module": "lib/mobx.module.js",
+    "unpkg": "lib/mobx.umd.min.js",
+    "jsnext:main": "lib/mobx.module.js",
+    "react-native": "lib/mobx.module.js",
+    "typings": "lib/mobx.d.ts",
+    "scripts": {
+        "test": "yarn jest",
+        "watch": "yarn jest --watch",
+        "test:mixed-versions": "jest --testRegex mixed-versions",
+        "test:all":
+            "yarn small-build && yarn jest -i && yarn test:flow && yarn test:mixed-versions",
+        "test:webpack": "node scripts/webpack-regression-tests.js",
+        "test:flow": "node_modules/.bin/flow check",
+        "test:performance":
+            "npm run small-build && PERSIST=true time node --expose-gc test/perf/index.js",
+        "test:travis":
+            "yarn test:all && yarn test:performance && yarn test -i --coverage && yarn test:webpack && yarn size",
+        "prettier":
+            "prettier --write --print-width 100 --tab-width 4 --no-semi \"**/*.js\" \"**/*.jsx\" \"**/*.tsx\" \"**/*.ts\"",
+        "_prepublish": "npm run small-build",
+        "quick-build": "tsc --pretty",
+        "small-build": "node scripts/build.js",
+        "lint":
+            "tslint -c tslint.json src/*.ts src/types/*.ts src/api/*.ts src/core/*.ts src/utils/*.ts",
+        "size": "size-limit --babili 20KB lib/mobx.js",
+        "precommit": "lint-staged"
     },
-    "testRegex": "test/base/.*\\.(t|j)sx?$",
-    "moduleFileExtensions": [
-      "ts",
-      "tsx",
-      "js",
-      "jsx",
-      "json"
-    ],
-    "testPathIgnorePatterns": [
-      "/node_modules/",
-      "/\\./"
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/mobxjs/mobx.git"
+    },
+    "author": "Michel Weststrate",
+    "license": "MIT",
+    "bugs": {
+        "url": "https://github.com/mobxjs/mobx/issues"
+    },
+    "files": ["lib", "LICENSE"],
+    "homepage": "https://mobx.js.org/",
+    "devDependencies": {
+        "@types/jest": "^21.1.9",
+        "@types/node": "^7.0.22",
+        "babel-core": "7.0.0-beta.3",
+        "babel-jest": "^23.6.0",
+        "babel-plugin-transform-regenerator": "^6.26.0",
+        "babel-preset-es2015": "7.0.0-beta.3",
+        "babel-preset-react": "7.0.0-beta.3",
+        "babel-preset-stage-1": "7.0.0-beta.3",
+        "browserify": "^12.0.1",
+        "chalk": "^1.1.3",
+        "coveralls": "^2.11.4",
+        "envify": "^4.1.0",
+        "flow-bin": "^0.59.0",
+        "fs-extra": "^3.0.1",
+        "husky": "^0.14.3",
+        "iterall": "^1.0.2",
+        "jest": "^23.6.0",
+        "lint-staged": "^3.6.1",
+        "lodash.intersection": "^3.2.0",
+        "ncp": "^2.0.0",
+        "prettier": "^1.4.4",
+        "regenerator-runtime": "^0.11.1",
+        "rollup": "^0.41.6",
+        "rollup-plugin-filesize": "^1.3.2",
+        "rollup-plugin-node-resolve": "^3.0.0",
+        "serializr": "^1.3.0",
+        "shelljs": "^0.8.2",
+        "size-limit": "^0.2.0",
+        "tape": "^4.2.2",
+        "ts-jest": "^22.0.0",
+        "tslib": "^1.7.1",
+        "typescript": "^2.9.0",
+        "uglify-es": "^3.3.9"
+    },
+    "dependencies": {},
+    "keywords": [
+        "mobx",
+        "mobservable",
+        "observable",
+        "react-component",
+        "react",
+        "reactjs",
+        "reactive",
+        "model",
+        "frp",
+        "functional-reactive-programming",
+        "state management",
+        "data flow"
     ],
-    "watchPathIgnorePatterns": [
-      "<rootDir>/node_modules/"
-    ]
-  }
-}
\ No newline at end of file
+    "lint-staged": {
+        "*.{ts,tsx,js,jsx}": [
+            "prettier --write --print-width 100 --tab-width 4 --no-semi",
+            "git add"
+        ]
+    },
+    "jest": {
+        "transform": {
+            "^.+\\.tsx?$": "ts-jest",
+            "^.+\\.jsx?$": "babel-jest"
+        },
+        "testRegex": "test/base/.*\\.(t|j)sx?$",
+        "moduleFileExtensions": ["ts", "tsx", "js", "jsx", "json"],
+        "testPathIgnorePatterns": ["/node_modules/", "/\\./"],
+        "watchPathIgnorePatterns": ["<rootDir>/node_modules/"]
+    }
+}
diff --git a/scripts/publish.js b/scripts/publish.js
index 041e23f6b..310de9066 100644
--- a/scripts/publish.js
+++ b/scripts/publish.js
@@ -1,41 +1,82 @@
-#!node_modules/.bin/nscript
-/* To run this script, nscript is needed: [sudo] npm install -g nscript
 /* Publish.js, publish a new version of the npm package as found in the current directory */
 /* Run this file from the root of the repository */
-module.exports = function(shell, npm, git) {
+
+const shell = require("shelljs")
+const fs = require("fs")
+const readline = require("readline")
+
+const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout
+})
+
+function run(command, options) {
+    const continueOnErrors = options && options.continueOnErrors
+    const ret = shell.exec(command, options)
+    if (!continueOnErrors && ret.code !== 0) {
+        shell.exit(1)
+    }
+    return ret
+}
+
+function exit(code, msg) {
+    console.error(msg)
+    shell.exit(code)
+}
+
+async function prompt(question, defaultValue) {
+    return new Promise(resolve => {
+        rl.question(`${question} [${defaultValue}]: `, resolve)
+    })
+}
+
+async function main() {
     // build
-    npm("run", "small-build")
+    run("npm run small-build")
 
-    var pkg = JSON.parse(shell.read("package.json"))
+    const pkg = JSON.parse(fs.readFileSync("package.json", "utf8"))
 
     // Bump version number
-    var nrs = pkg.version.split(".")
+    let nrs = pkg.version.split(".")
     nrs[2] = 1 + parseInt(nrs[2], 10)
-    var version = (pkg.version = shell.prompt(
+    const version = (pkg.version = await prompt(
         "Please specify the new package version of '" + pkg.name + "' (Ctrl^C to abort)",
         nrs.join(".")
     ))
-    if (!version.match(/^\d+\.\d+\.\d+$/)) shell.exit(1, "Invalid semantic version: " + version)
+    if (!version.match(/^\d+\.\d+\.\d+$/)) {
+        exit(1, "Invalid semantic version: " + version)
+    }
 
-    // Check registery data
-    if (npm.silent().test("info", pkg.name)) {
+    // Check registry data
+    const npmInfoRet = run(`npm info ${pkg.name} --json`, {
+        continueOnErrors: true,
+        silent: true
+    })
+    if (npmInfoRet.code === 0) {
         //package is registered in npm?
-        var publishedPackageInfo = JSON.parse(npm.get("info", pkg.name, "--json"))
+        var publishedPackageInfo = JSON.parse(npmInfoRet.stdout)
         if (
             publishedPackageInfo.versions == version ||
-            publishedPackageInfo.versions.indexOf(version) != -1
-        )
-            shell.exit(2, "Version " + pkg.version + " is already published to npm")
+            publishedPackageInfo.versions.includes(version)
+        ) {
+            exit(2, "Version " + pkg.version + " is already published to npm")
+        }
 
-        shell.write("package.json", JSON.stringify(pkg, null, 2))
+        fs.writeFileSync("package.json", JSON.stringify(pkg, null, 2), "utf8")
 
         // Finally, commit and publish!
-        npm("publish")
-        git("commit", "-am", "Published version " + version)
-        git("tag", version)
+        run("npm publish")
+        run(`git commit -am "Published version ${version}"`)
+        run(`git tag ${version}`)
 
-        git("push")
-        git("push", "--tags")
+        run("git push")
+        run("git push --tags")
         console.log("Published!")
-    } else shell.exit(1, pkg.name + " is not an existing npm package")
+    } else {
+        exit(1, pkg.name + " is not an existing npm package")
+    }
 }
+
+main().catch(e => {
+    throw e
+})
diff --git a/yarn.lock b/yarn.lock
index d0d383115..daf6fa8d6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1311,13 +1311,6 @@ boxen@^1.1.0:
     term-size "^1.2.0"
     widest-line "^2.0.0"
 
-brace-expansion@^1.0.0:
-  version "1.1.8"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.8.tgz#c07b211c7c952ec1f8efd51a77ef0d1d3990a292"
-  dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
-
 brace-expansion@^1.1.7:
   version "1.1.11"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
@@ -1708,10 +1701,6 @@ color-name@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
 
-colors@^1.0.3:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/colors/-/colors-1.1.2.tgz#168a4701756b6a7f51a12ce0c97bfa28c084ed63"
-
 colors@^1.1.2:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/colors/-/colors-1.3.0.tgz#5f20c9fef6945cb1134260aab33bfbdc8295e04e"
@@ -1731,10 +1720,6 @@ combined-stream@1.0.6, combined-stream@^1.0.5, combined-stream@~1.0.5:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@^2.6.0:
-  version "2.11.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.11.0.tgz#157152fd1e7a6c8d98a5b715cf376df928004563"
-
 commander@^2.9.0:
   version "2.15.1"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.15.1.tgz#df46e867d0fc2aec66a34662b406a9ccafff5b0f"
@@ -2506,10 +2491,6 @@ fb-watchman@^2.0.0:
   dependencies:
     bser "^2.0.0"
 
-fibers@^1.0.2:
-  version "1.0.15"
-  resolved "https://registry.yarnpkg.com/fibers/-/fibers-1.0.15.tgz#22f039c8f18b856190fbbe4decf056154c1eae9c"
-
 figures@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/figures/-/figures-1.7.0.tgz#cbe1e3affcf1cd44b80cadfed28dc793a9701d2e"
@@ -2739,22 +2720,24 @@ glob2base@^0.0.12:
   dependencies:
     find-index "^0.1.1"
 
-glob@^4.3.2:
-  version "4.5.3"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-4.5.3.tgz#c6cb73d3226c1efef04de3c56d012f03377ee15f"
+glob@^5.0.15:
+  version "5.0.15"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-5.0.15.tgz#1bc936b9e02f4a603fcc222ecf7633d30b8b93b1"
   dependencies:
     inflight "^1.0.4"
     inherits "2"
-    minimatch "^2.0.1"
+    minimatch "2 || 3"
     once "^1.3.0"
+    path-is-absolute "^1.0.0"
 
-glob@^5.0.15:
-  version "5.0.15"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-5.0.15.tgz#1bc936b9e02f4a603fcc222ecf7633d30b8b93b1"
+glob@^7.0.0:
+  version "7.1.3"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.3.tgz#3960832d3f1574108342dafd3a67b332c0969df1"
   dependencies:
+    fs.realpath "^1.0.0"
     inflight "^1.0.4"
     inherits "2"
-    minimatch "2 || 3"
+    minimatch "^3.0.4"
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
@@ -2906,10 +2889,6 @@ hoek@2.x.x:
   version "2.16.3"
   resolved "https://registry.yarnpkg.com/hoek/-/hoek-2.16.3.tgz#20bb7403d3cea398e91dc4710a8ff1b8274a25ed"
 
-home-dir@^0.2.0:
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/home-dir/-/home-dir-0.2.0.tgz#765cac335384b51f31fd0448e4cdd8066e1e2c8f"
-
 home-or-tmp@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/home-or-tmp/-/home-or-tmp-2.0.0.tgz#e36c3f2d2cae7d746a857e38d18d5f32a7882db8"
@@ -4345,12 +4324,6 @@ minimalistic-crypto-utils@^1.0.0, minimalistic-crypto-utils@^1.0.1:
   dependencies:
     brace-expansion "^1.1.7"
 
-minimatch@^2.0.1:
-  version "2.0.10"
-  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-2.0.10.tgz#8d087c39c6b38c001b97fca7ce6d0e1e80afbac7"
-  dependencies:
-    brace-expansion "^1.0.0"
-
 minimist@0.0.8:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
@@ -4576,16 +4549,6 @@ npmlog@^4.0.2:
     gauge "~2.7.3"
     set-blocking "~2.0.0"
 
-nscript@^0.1.10:
-  version "0.1.10"
-  resolved "https://registry.yarnpkg.com/nscript/-/nscript-0.1.10.tgz#25b5925f84a62769b07c1fe6372d7c7cfad4e904"
-  dependencies:
-    colors "^1.0.3"
-    commander "^2.6.0"
-    fibers "^1.0.2"
-    glob "^4.3.2"
-    home-dir "^0.2.0"
-
 number-is-nan@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/number-is-nan/-/number-is-nan-1.0.1.tgz#097b602b53422a522c1afb8790318336941a011d"
@@ -5115,6 +5078,12 @@ realpath-native@^1.0.0:
   dependencies:
     util.promisify "^1.0.0"
 
+rechoir@^0.6.2:
+  version "0.6.2"
+  resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz#85204b54dba82d5742e28c96756ef43af50e3384"
+  dependencies:
+    resolve "^1.1.6"
+
 regenerate-unicode-properties@^5.1.1:
   version "5.1.3"
   resolved "https://registry.yarnpkg.com/regenerate-unicode-properties/-/regenerate-unicode-properties-5.1.3.tgz#54f5891543468f36f2274b67c6bc4c033c27b308"
@@ -5525,6 +5494,14 @@ shell-quote@^1.4.3, shell-quote@^1.6.1:
     array-reduce "~0.0.0"
     jsonify "~0.0.0"
 
+shelljs@^0.8.2:
+  version "0.8.2"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.2.tgz#345b7df7763f4c2340d584abb532c5f752ca9e35"
+  dependencies:
+    glob "^7.0.0"
+    interpret "^1.0.0"
+    rechoir "^0.6.2"
+
 shellwords@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/shellwords/-/shellwords-0.1.1.tgz#d6b9181c1a48d397324c84871efbcfc73fc0654b"