diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..4e50c9e
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,10 @@
+# editorconfig.org
+root = true
+
+[*]
+indent_size = 2
+indent_style = space
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..9555e17
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1 @@
+tag-version-prefix=""
diff --git a/.travis.yml b/.travis.yml
index 4f1905f..6d41a79 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,5 +4,7 @@ node_js:
   - 5
   - 6
   - 6.5.0
+  - 8
+  - 10
 script: "npm run-script test-w-coverage"
 after_script: "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"
diff --git a/README.md b/README.md
index 1a73074..23974f2 100644
--- a/README.md
+++ b/README.md
@@ -3,24 +3,23 @@
 # Dockerfilejs
 #### A simple Dockerfile generator. [Try it now!](https://tonicdev.com/npm/dockerfilejs)
 ```javascript
-var Dockerfile = require("dockerfilejs").Dockerfile
-
-var file = new Dockerfile()
+var Dockerfile = require("dockerfilejs").Dockerfile;
+var file = new Dockerfile();
 
 file.comment('The above code example yields this file!')
-.env({DEBUG:'express:* node index.js'})
-.expose(8080)
-.separator('\n')
-.from({ image : 'node', tag : '4-onbuild'})
-.comment('FROM gets bumped under initial comments')
-.render()
+  .env({DEBUG:'express:* node index.js'})
+  .expose(8080)
+  .separator('\n')
+  .from({ image : 'node', tag : 'latest'})
+  .comment('FROM gets bumped under initial comments')
+  .render();
 ```
 
 ```Dockerfile
 # The above code example yields this file!
-FROM node:4-onbuild
+FROM node:latest
 ENV DEBUG="express:* node index.js"
-EXPOSE [ 8080 ]
+EXPOSE 8080
 # FROM gets bumped under initial comments
 ```
 
@@ -33,7 +32,7 @@ file.env({
         at : {
             all: 'really!'
         }
-}}).render()
+}}).render();
 /*
 ENV complex.objects="are not" \
     complex.a=problem \
@@ -43,30 +42,33 @@ ENV complex.objects="are not" \
 
 #### Made a mistake? Get rid of it!
 ```javascript
-file.copy('~/.ssh/*', '/tmp')
+file.copy('~/.ssh/*', '/tmp');
 // oops!
-file.steps().pop()
+file.steps().pop();
 ```
 
 #### Advanced examples
 ```javascript
-file.label({ complex: { objects: 'allowed' } })
+file.separator('\n')
+// Will set the separator of each step for the entire file.render() output
+
+file.label({ complex: { objects: 'allowed' } });
 // LABEL complex.objects="allowed"
 
-file.expose([8080, '8081', { number:443, protocol:'tcp' }])
-// EXPOSE [ 8080, 8081, 443/tcp ]
+file.expose([8080, '8081', { number: 443, protocol: 'tcp' }]);
+// EXPOSE 8080 8081 443/tcp
 
-file.run({command: ['touch /file.txt', ['echo', 'hello world', '>>', '/file.txt']]})
+file.run({ command: ['touch /file.txt', ['echo', 'hello world', '>>', '/file.txt'] ] });
 // RUN touch /file.txt \
 //   && echo "hello world" >> /file.txt
 
-file.copy({ src : ['/id_rsa', '/id_rsa.pub'], dest: '/root/.ssh/' }, true)
+file.copy({ src : ['/id_rsa', '/id_rsa.pub'], dest: '/root/.ssh/' }, true);
 // ONBUILD COPY ["/id_rsa", "/id_rsa.pub", "/root/.ssh"]
 
-file.cmd({executable: '/bin/bash', params: ['-c', 'hello world'] })
+file.cmd({ executable: '/bin/bash', params: ['-c', 'hello world'] });
 // CMD ["/bin/bash", "-c", "hello world"]
 
-file.cmd({command:'/bin/bash', params: ['-c', 'hello world'] })
+file.cmd({ command:'/bin/bash', params: ['-c', 'hello world'] })
 // CMD /bin/bash -c "hello world"
 
 file.healthCheck({
@@ -77,9 +79,9 @@ file.healthCheck({
 // HEALTHCHECK --retries=4 --timeout=30s \
 //   CMD wget example.com
 
-file.from({image: 'node', registry:'docker.io', tag:'4-onbuild'})
-// FROM docker.io/node:4-onbuild
+file.user('root');
+// USER root
 
-file.separator('\n')
-// Will set the separator of each step for the entire file.render() output
+file.from({ image: 'node', registry: 'docker.io', tag: '10-alpine' })
+// FROM docker.io/node:10-alpine
 ```
diff --git a/lib/instruction_error.js b/lib/instruction-error.js
similarity index 100%
rename from lib/instruction_error.js
rename to lib/instruction-error.js
diff --git a/lib/instruction.js b/lib/instruction.js
index 60ab218..b9a622b 100644
--- a/lib/instruction.js
+++ b/lib/instruction.js
@@ -1,4 +1,4 @@
-const errors = require('./instruction_error.js')
+const errors = require('./instruction-error.js')
 
 function boxAndFilter(arrayOrString) {
   if(!Array.isArray(arrayOrString))
@@ -19,7 +19,7 @@ function onBuild(instruction) {
 *   FROM <image>:<tag>
 *   FROM <image>@<digest>
 *
-* Parameters: 
+* Parameters:
 *   image, (optional) tag, digest, registry
 *
 * Not standard:
@@ -81,7 +81,7 @@ function mapToQuote(string) {
 * Input string: returns trimmed string
 * Input array of strings: returns a array of trimmed strings
 *
-* Note: Strings with WS in an array will be encapsulated by quotes 
+* Note: Strings with WS in an array will be encapsulated by quotes
 */
 function mapCommandParams(command) {
   if(Array.isArray(command)) {
@@ -93,7 +93,7 @@ function mapCommandParams(command) {
 /**
 * Case:
 *   RUN <command>
-* Parameters: 
+* Parameters:
 *   command (alias: commands)
 *
 * Expect string of well-formed command or an array of strings of
@@ -142,9 +142,9 @@ function run(run) {
 *
 * Parameters:
 *   params and or (executable or command)
-*   
+*
 *   Params may be empty if and only if executable or command is provided
-*   
+*
 *   Solely providing the params property will yield the second case.
 *   Providing the executable or command property will yield the first or third cases respectively.
 *   Providing command and executable will throw an error
@@ -190,7 +190,7 @@ function cmd(cmd) {
 /**
 * Case:
 *   ENTRYPOINT ["executable", "param1", "param2"]
-* 
+*
 * Docs:
 *   https://docs.docker.com/engine/reference/builder/#/entrypoint
 *
@@ -212,7 +212,7 @@ function entryPoint(entrypoint) {
   return instruction
 }
 
-/** 
+/**
 * Flattens objects into an array of arrays, returns null if object has no OwnProperties.
 */
 function flattenLabels(o, namespace) {
@@ -241,7 +241,7 @@ function mapLabel(label) {
 /**
 * Case:
 *   LABEL multi.label1="value1" multi.label2="value2" other="value3"
-*   
+*
 *
 */
 function label(labels, onbuild) {
@@ -260,7 +260,7 @@ function label(labels, onbuild) {
 /**
 * Case:
 *   EXPOSE <port> [<port>...]
-*   
+*
 * Expects an array of ports as numbers, strings, or an object of {number: <num or str>, protocol: <string> }
 * If a port object is provided and the protocol field is blank it will be omitted.
 *
@@ -272,7 +272,7 @@ function label(labels, onbuild) {
 *   ]
 * }
 * instructions.expose(config.ports)
-* 
+*
 * A "port object" may also specify from and to for a range of exposed ports, though
 * simply supplying '8080-8086' will do the same.
 *
@@ -301,7 +301,7 @@ function expose(expose, onbuild) {
     })
 
   if(expose.length) {
-    instruction = `EXPOSE [ ${expose.join(', ')} ]`
+    instruction = `EXPOSE ${expose.join(' ')}`
   } else {
     throw new errors.InstructionError(
       'expose',
@@ -315,7 +315,7 @@ function expose(expose, onbuild) {
 /**
 * ENV <key> <value>
 * ENV <key>=<value> ...
-* 
+*
 * Parameters:
 *   1) Any object with terminal property-values of string, or number type.
 */
@@ -340,7 +340,7 @@ function copyInternal(command, src, dest, onbuild) {
 
   if(src.length == 0) {
     throw new errors.EmptyArrayError(command, 'src')
-  } 
+  }
 
   if(dest && dest.length) {
     instruction = `${command} [${src.map(enQuote).join(', ')}, "${dest}"]`
@@ -423,7 +423,7 @@ function healthCheck(healthCheck) {
       if(keys.length) {
         options = keys.map(k => {
           return `--${k}=${options[k]}`
-        }).reduce((a,b) => a+' '+b)        
+        }).reduce((a,b) => a+' '+b)
       }
     }
 
@@ -452,7 +452,7 @@ function comment() {
   var args = []
   for(var i = 0; i < arguments.length; ++i)
     args.push(arguments[i])
-  return '# ' + args.map(arg => arg ? arg.toString() : arg).join(' ') 
+  return '# ' + args.map(arg => arg ? arg.toString() : arg).join(' ')
 }
 
 module.exports.from = from
@@ -471,4 +471,4 @@ module.exports.stopSignal = stopSignal
 module.exports.volume = volume
 module.exports.healthCheck = healthCheck
 module.exports.shell = shell
-module.exports.comment = comment
\ No newline at end of file
+module.exports.comment = comment
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..16baccf
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1295 @@
+{
+  "name": "dockerfilejs",
+  "version": "1.0.9",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "abbrev": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
+    "align-text": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
+      "dev": true,
+      "requires": {
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
+      }
+    },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
+    },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "asn1": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
+      "dev": true
+    },
+    "assert-plus": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
+      "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
+      "dev": true
+    },
+    "assertion-error": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
+      "dev": true
+    },
+    "async": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
+      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
+      "dev": true
+    },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
+    "aws-sign2": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz",
+      "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8=",
+      "dev": true
+    },
+    "aws4": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.7.0.tgz",
+      "integrity": "sha512-32NDda82rhwD9/JBCCkB+MRYDp0oSvlo2IL6rQWA10PQi7tDUM3eqMSltXmY+Oyl/7N3P3qNtAlv7X0d9bI28w==",
+      "dev": true
+    },
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "tweetnacl": "^0.14.3"
+      }
+    },
+    "boom": {
+      "version": "2.10.1",
+      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
+      "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
+      "dev": true,
+      "requires": {
+        "hoek": "2.x.x"
+      }
+    },
+    "brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "requires": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "browser-stdout": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
+    "camelcase": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+      "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
+      "dev": true,
+      "optional": true
+    },
+    "caseless": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.11.0.tgz",
+      "integrity": "sha1-cVuW6phBWTzDMGeSP17GDr2k99c=",
+      "dev": true
+    },
+    "center-align": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
+      "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "align-text": "^0.1.3",
+        "lazy-cache": "^1.0.3"
+      }
+    },
+    "chai": {
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-3.5.0.tgz",
+      "integrity": "sha1-TQJjewZ/6Vi9v906QOxW/vc3Mkc=",
+      "dev": true,
+      "requires": {
+        "assertion-error": "^1.0.1",
+        "deep-eql": "^0.1.3",
+        "type-detect": "^1.0.0"
+      }
+    },
+    "chalk": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^2.2.1",
+        "escape-string-regexp": "^1.0.2",
+        "has-ansi": "^2.0.0",
+        "strip-ansi": "^3.0.0",
+        "supports-color": "^2.0.0"
+      }
+    },
+    "cliui": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
+      "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "center-align": "^0.1.1",
+        "right-align": "^0.1.1",
+        "wordwrap": "0.0.2"
+      },
+      "dependencies": {
+        "wordwrap": {
+          "version": "0.0.2",
+          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
+          "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
+    "combined-stream": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+      "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
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+      "requires": {
+        "delayed-stream": "~1.0.0"
+      }
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+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.16.0.tgz",
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+    },
+    "concat-map": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
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+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
+      "dev": true
+    },
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+      "resolved": "https://registry.npmjs.org/coveralls/-/coveralls-2.13.3.tgz",
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+      "requires": {
+        "js-yaml": "3.6.1",
+        "lcov-parse": "0.0.10",
+        "log-driver": "1.2.5",
+        "minimist": "1.2.0",
+        "request": "2.79.0"
+      }
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+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/cryptiles/-/cryptiles-2.0.5.tgz",
+      "integrity": "sha1-O9/s3GCBR8HGcgL6KR59ylnqo7g=",
+      "dev": true,
+      "requires": {
+        "boom": "2.x.x"
+      }
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+      "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
+      "integrity": "sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "^1.0.0"
+      },
+      "dependencies": {
+        "assert-plus": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+          "dev": true
+        }
+      }
+    },
+    "debug": {
+      "version": "2.6.8",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.8.tgz",
+      "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
+      "dev": true,
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "dev": true,
+      "optional": true
+    },
+    "deep-eql": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-0.1.3.tgz",
+      "integrity": "sha1-71WKyrjeJSBs1xOQbXTlaTDrafI=",
+      "dev": true,
+      "requires": {
+        "type-detect": "0.1.1"
+      },
+      "dependencies": {
+        "type-detect": {
+          "version": "0.1.1",
+          "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-0.1.1.tgz",
+          "integrity": "sha1-C6XsKohWQORw6k6FBZcZANrFiCI=",
+          "dev": true
+        }
+      }
+    },
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+}
diff --git a/package.json b/package.json
index 0ad6a2b..14444aa 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "dockerfilejs",
-  "version": "1.0.6",
+  "version": "1.0.9",
   "description": "Dockerfile-js, render well-formed Dockerfiles.",
   "main": "dockerfile.js",
   "directories": {
diff --git a/test/instruction/test_expose.js b/test/instruction/test_expose.js
new file mode 100644
index 0000000..ce53426
--- /dev/null
+++ b/test/instruction/test_expose.js
@@ -0,0 +1,24 @@
+var ins = require('../test.js').instruction
+var assert = require('chai').assert
+
+describe('testing instruction expose', () => {
+  it('should produce EXPOSE 8080', ()=> {
+    const result = ins.expose(8080)
+    assert.equal(result, 'EXPOSE 8080')
+  });
+
+  it('should produce EXPOSE 8080/tcp', ()=> {
+    const result = ins.expose({ number: 8080, protocol: 'tcp' })
+    assert.equal(result, 'EXPOSE 8080/tcp')
+  });
+
+  it('should produce EXPOSE 8000-9000', ()=> {
+    const result = ins.expose({ from: 8000, to: '9000' })
+    assert.equal(result, 'EXPOSE 8000-9000')
+  });
+
+  it('should produce EXPOSE 8000-9000/udp', ()=> {
+    const result = ins.expose({ from: 8000, to: '9000', protocol: 'udp' })
+    assert.equal(result, 'EXPOSE 8000-9000/udp')
+  });
+});