diff --git a/api-server/common/utils/polyvinyl.js b/api-server/common/utils/polyvinyl.js
deleted file mode 100644
index 790f8bd508..0000000000
--- a/api-server/common/utils/polyvinyl.js
+++ /dev/null
@@ -1,206 +0,0 @@
-// originally based off of https://github.com/gulpjs/vinyl
-import invariant from 'invariant';
-import { Observable } from 'rx';
-import castToObservable from '../../server/utils/cast-to-observable';
-
-// createFileStream(
-//   files: [...PolyVinyl]
-// ) => Observable[...Observable[...PolyVinyl]]
-export function createFileStream(files = []) {
-  return Observable.of(Observable.from(files));
-}
-
-// Observable::pipe(
-//  project(
-//    file: PolyVinyl
-//  ) => PolyVinyl|Observable[PolyVinyl]|Promise[PolyVinyl]
-// ) => Observable[...Observable[...PolyVinyl]]
-export function pipe(project) {
-  const source = this;
-  return source.map(files =>
-    files.flatMap(file => castToObservable(project(file)))
-  );
-}
-
-// interface PolyVinyl {
-//   source: String,
-//   contents: String,
-//   name: String,
-//   ext: String,
-//   path: String,
-//   key: String,
-//   head: String,
-//   tail: String,
-//   history: [...String],
-//   error: Null|Object|Error
-// }
-
-// createPoly({
-//   name: String,
-//   ext: String,
-//   contents: String,
-//   history?: [...String],
-// }) => PolyVinyl, throws
-export function createPoly({ name, ext, contents, history, ...rest } = {}) {
-  invariant(typeof name === 'string', 'name must be a string but got %s', name);
-
-  invariant(typeof ext === 'string', 'ext must be a string, but was %s', ext);
-
-  invariant(
-    typeof contents === 'string',
-    'contents must be a string but got %s',
-    contents
-  );
-
-  return {
-    ...rest,
-    history: Array.isArray(history) ? history : [name + ext],
-    name,
-    ext,
-    path: name + '.' + ext,
-    key: name + ext,
-    contents,
-    error: null
-  };
-}
-
-// isPoly(poly: Any) => Boolean
-export function isPoly(poly) {
-  return (
-    poly &&
-    typeof poly.contents === 'string' &&
-    typeof poly.name === 'string' &&
-    typeof poly.ext === 'string' &&
-    Array.isArray(poly.history)
-  );
-}
-
-// checkPoly(poly: Any) => Void, throws
-export function checkPoly(poly) {
-  invariant(
-    isPoly(poly),
-    'function should receive a PolyVinyl, but got %s',
-    poly
-  );
-}
-
-// isEmpty(poly: PolyVinyl) => Boolean, throws
-export function isEmpty(poly) {
-  checkPoly(poly);
-  return !!poly.contents;
-}
-
-// setContent(contents: String, poly: PolyVinyl) => PolyVinyl
-// setContent will loose source if set
-export function setContent(contents, poly) {
-  checkPoly(poly);
-  return {
-    ...poly,
-    contents,
-    source: null
-  };
-}
-
-// setExt(ext: String, poly: PolyVinyl) => PolyVinyl
-export function setExt(ext, poly) {
-  checkPoly(poly);
-  const newPoly = {
-    ...poly,
-    ext,
-    path: poly.name + '.' + ext,
-    key: poly.name + ext
-  };
-  newPoly.history = [...poly.history, newPoly.path];
-  return newPoly;
-}
-
-// setName(name: String, poly: PolyVinyl) => PolyVinyl
-export function setName(name, poly) {
-  checkPoly(poly);
-  const newPoly = {
-    ...poly,
-    name,
-    path: name + '.' + poly.ext,
-    key: name + poly.ext
-  };
-  newPoly.history = [...poly.history, newPoly.path];
-  return newPoly;
-}
-
-// setError(error: Object, poly: PolyVinyl) => PolyVinyl
-export function setError(error, poly) {
-  invariant(
-    typeof error === 'object',
-    'error must be an object or null, but got %',
-    error
-  );
-  checkPoly(poly);
-  return {
-    ...poly,
-    error
-  };
-}
-
-// clearHeadTail(poly: PolyVinyl) => PolyVinyl
-export function clearHeadTail(poly) {
-  checkPoly(poly);
-  return {
-    ...poly,
-    head: '',
-    tail: ''
-  };
-}
-
-// appendToTail (tail: String, poly: PolyVinyl) => PolyVinyl
-export function appendToTail(tail, poly) {
-  checkPoly(poly);
-  return {
-    ...poly,
-    tail: poly.tail.concat(tail)
-  };
-}
-
-// compileHeadTail(padding: String, poly: PolyVinyl) => PolyVinyl
-export function compileHeadTail(padding = '', poly) {
-  return clearHeadTail(
-    transformContents(
-      () => [poly.head, poly.contents, poly.tail].join(padding),
-      poly
-    )
-  );
-}
-
-// transformContents(
-//   wrap: (contents: String) => String,
-//   poly: PolyVinyl
-// ) => PolyVinyl
-// transformContents will keep a copy of the original
-// code in the `source` property. If the original polyvinyl
-// already contains a source, this version will continue as
-// the source property
-export function transformContents(wrap, poly) {
-  const newPoly = setContent(wrap(poly.contents), poly);
-  // if no source exist, set the original contents as source
-  newPoly.source = poly.source || poly.contents;
-  return newPoly;
-}
-
-// transformHeadTailAndContents(
-//   wrap: (source: String) => String,
-//   poly: PolyVinyl
-// ) => PolyVinyl
-export function transformHeadTailAndContents(wrap, poly) {
-  return {
-    ...transformContents(wrap, poly),
-    head: wrap(poly.head),
-    tail: wrap(poly.tail)
-  };
-}
-
-export function testContents(predicate, poly) {
-  return !!predicate(poly.contents);
-}
-
-export function updateFileFromSpec(spec, poly) {
-  return setContent(poly.contents, createPoly(spec));
-}
diff --git a/api-server/server/middlewares/validator.js b/api-server/server/middlewares/validator.js
index 84bdefd7f5..8a703ec64c 100644
--- a/api-server/server/middlewares/validator.js
+++ b/api-server/server/middlewares/validator.js
@@ -1,5 +1,5 @@
 import validator from 'express-validator';
-import { isPoly } from '../../common/utils/polyvinyl';
+import { isPoly } from '../../../utils/polyvinyl';
 
 const isObject = val => !!val && typeof val === 'object';
 
diff --git a/client/gatsby-node.js b/client/gatsby-node.js
index cb55e2a8d0..bd51d687ba 100644
--- a/client/gatsby-node.js
+++ b/client/gatsby-node.js
@@ -3,7 +3,7 @@ const env = require('../config/env');
 const { createFilePath } = require('gatsby-source-filesystem');
 
 const { dasherize } = require('../utils/slugs');
-const { blockNameify } = require('./utils/blockNameify');
+const { blockNameify } = require('../utils/block-nameify');
 const {
   createChallengePages,
   createBlockIntroPages,
diff --git a/client/src/components/Donation/DonationModal.js b/client/src/components/Donation/DonationModal.js
index fdde372a5e..4f52394526 100644
--- a/client/src/components/Donation/DonationModal.js
+++ b/client/src/components/Donation/DonationModal.js
@@ -6,7 +6,7 @@ import { connect } from 'react-redux';
 import { createSelector } from 'reselect';
 import { Modal, Button, Col, Row } from '@freecodecamp/react-bootstrap';
 import { Spacer } from '../helpers';
-import { blockNameify } from '../../../utils/blockNameify';
+import { blockNameify } from '../../../../utils/block-nameify';
 import Heart from '../../assets/icons/Heart';
 import Cup from '../../assets/icons/Cup';
 import MinimalDonateForm from './MinimalDonateForm';
diff --git a/client/src/components/Map/components/Block.js b/client/src/components/Map/components/Block.js
index 437178342b..12e23ab9eb 100644
--- a/client/src/components/Map/components/Block.js
+++ b/client/src/components/Map/components/Block.js
@@ -8,7 +8,7 @@ import { Link } from 'gatsby';
 import { makeExpandedBlockSelector, toggleBlock } from '../redux';
 import { completedChallengesSelector, executeGA } from '../../../redux';
 import Caret from '../../../assets/icons/Caret';
-import { blockNameify } from '../../../../utils/blockNameify';
+import { blockNameify } from '../../../../../utils/block-nameify';
 import GreenPass from '../../../assets/icons/GreenPass';
 import GreenNotCompleted from '../../../assets/icons/GreenNotCompleted';
 import IntroInformation from '../../../assets/icons/IntroInformation';
diff --git a/client/src/templates/Challenges/rechallenge/builders.js b/client/src/templates/Challenges/rechallenge/builders.js
index 6e20ab18bb..f3f7db4356 100644
--- a/client/src/templates/Challenges/rechallenge/builders.js
+++ b/client/src/templates/Challenges/rechallenge/builders.js
@@ -8,7 +8,11 @@ import {
   template as _template
 } from 'lodash';
 
-import { compileHeadTail, setExt, transformContents } from '../utils/polyvinyl';
+import {
+  compileHeadTail,
+  setExt,
+  transformContents
+} from '../../../../../utils/polyvinyl';
 
 const htmlCatch = '\n<!--fcc-->\n';
 const jsCatch = '\n;/*fcc*/\n';
diff --git a/client/src/templates/Challenges/rechallenge/transformers.js b/client/src/templates/Challenges/rechallenge/transformers.js
index 90fd88394f..0dc65c2a0f 100644
--- a/client/src/templates/Challenges/rechallenge/transformers.js
+++ b/client/src/templates/Challenges/rechallenge/transformers.js
@@ -12,7 +12,7 @@ import {
 
 import protect from '@freecodecamp/loop-protect';
 
-import * as vinyl from '../utils/polyvinyl.js';
+import * as vinyl from '../../../../../utils/polyvinyl.js';
 import createWorker from '../utils/worker-executor';
 
 // the config files are created during the build, but not before linting
diff --git a/client/src/templates/Challenges/redux/code-storage-epic.js b/client/src/templates/Challenges/redux/code-storage-epic.js
index 5e74323f0b..4c7f300ca6 100644
--- a/client/src/templates/Challenges/redux/code-storage-epic.js
+++ b/client/src/templates/Challenges/redux/code-storage-epic.js
@@ -14,7 +14,7 @@ import {
 
 import { types as appTypes } from '../../../redux';
 
-import { setContent, isPoly } from '../utils/polyvinyl';
+import { setContent, isPoly } from '../../../../../utils/polyvinyl';
 
 import { createFlashMessage } from '../../../components/Flash/redux';
 
diff --git a/client/src/templates/Challenges/redux/index.js b/client/src/templates/Challenges/redux/index.js
index b8e94f9880..3ae8e8c452 100644
--- a/client/src/templates/Challenges/redux/index.js
+++ b/client/src/templates/Challenges/redux/index.js
@@ -2,7 +2,7 @@ import { createAction, handleActions } from 'redux-actions';
 
 import { createTypes } from '../../../../utils/stateManagement';
 
-import { createPoly } from '../utils/polyvinyl';
+import { createPoly } from '../../../../../utils/polyvinyl';
 import challengeModalEpic from './challenge-modal-epic';
 import completionEpic from './completion-epic';
 import codeLockEpic from './code-lock-epic';
diff --git a/client/utils/buildChallenges.js b/client/utils/buildChallenges.js
index 9c02ffcbc8..90ab93665a 100644
--- a/client/utils/buildChallenges.js
+++ b/client/utils/buildChallenges.js
@@ -7,7 +7,7 @@ const {
 } = require('../../curriculum/getChallenges');
 const { dasherize, nameify } = require('../../utils/slugs');
 const { locale } = require('../config/env.json');
-const { blockNameify } = require('./blockNameify');
+const { blockNameify } = require('../../utils/block-nameify');
 
 const arrToString = arr =>
   Array.isArray(arr) ? arr.join('\n') : _.toString(arr);
diff --git a/curriculum/getChallenges.js b/curriculum/getChallenges.js
index e7fa732bd2..f0c42cdc55 100644
--- a/curriculum/getChallenges.js
+++ b/curriculum/getChallenges.js
@@ -6,8 +6,6 @@ const fs = require('fs');
 
 const { dasherize } = require('../utils/slugs');
 
-const { challengeSchemaValidator } = require('./schema/challengeSchema');
-
 const challengesDir = path.resolve(__dirname, './challenges');
 const metaDir = path.resolve(challengesDir, '_meta');
 exports.challengesDir = challengesDir;
@@ -38,13 +36,13 @@ exports.getChallengesForLang = function getChallengesForLang(lang) {
     readDirP({ root: getChallengesDirForLang(lang) })
       .on('data', file => {
         running++;
-        buildCurriculum(file, curriculum, lang).then(done);
+        buildCurriculum(file, curriculum).then(done);
       })
       .on('end', done);
   });
 };
 
-async function buildCurriculum(file, curriculum, lang) {
+async function buildCurriculum(file, curriculum) {
   const { name, depth, path: filePath, fullPath, stat } = file;
   if (depth === 1 && stat.isDirectory()) {
     // extract the superBlock info
@@ -80,12 +78,12 @@ async function buildCurriculum(file, curriculum, lang) {
   }
   const { meta } = challengeBlock;
 
-  const challenge = await createChallenge(fullPath, meta, lang);
+  const challenge = await createChallenge(fullPath, meta);
 
   challengeBlock.challenges = [...challengeBlock.challenges, challenge];
 }
 
-async function createChallenge(fullPath, maybeMeta, lang) {
+async function createChallenge(fullPath, maybeMeta) {
   let meta;
   if (maybeMeta) {
     meta = maybeMeta;
@@ -98,11 +96,6 @@ async function createChallenge(fullPath, maybeMeta, lang) {
   }
   const { name: superBlock } = superBlockInfoFromFullPath(fullPath);
   const challenge = await parseMarkdown(fullPath);
-  const result = challengeSchemaValidator(lang)(challenge);
-  if (result.error) {
-    console.log(result.value);
-    throw new Error(result.error);
-  }
   const challengeOrder = findIndex(
     meta.challengeOrder,
     ([id]) => id === challenge.id
diff --git a/curriculum/test/test-challenges.js b/curriculum/test/test-challenges.js
index dcfc44495b..1a9f074162 100644
--- a/curriculum/test/test-challenges.js
+++ b/curriculum/test/test-challenges.js
@@ -53,9 +53,7 @@ const {
   buildJSChallenge
 } = require('../../client/src/templates/Challenges/utils/build');
 
-const {
-  createPoly
-} = require('../../client/src/templates/Challenges/utils/polyvinyl');
+const { createPoly } = require('../../utils/polyvinyl');
 
 const testEvaluator = require('../../client/config/test-evaluator').filename;
 
@@ -323,24 +321,24 @@ function populateTestsForLang({ lang, challenges }, meta) {
           });
 
           let { files = [] } = challenge;
-          let createTestRunner;
           if (challengeType === challengeTypes.backend) {
             it('Check tests is not implemented.');
             return;
-          } else if (
-            challengeType === challengeTypes.js ||
-            challengeType === challengeTypes.bonfire
-          ) {
-            createTestRunner = createTestRunnerForJSChallenge;
-          } else if (files.length === 1) {
-            createTestRunner = createTestRunnerForDOMChallenge;
-          } else {
+          }
+
+          if (files.length > 1) {
             it('Check tests.', () => {
               throw new Error('Seed file should be only the one.');
             });
             return;
           }
 
+          const buildChallenge =
+            challengeType === challengeTypes.js ||
+            challengeType === challengeTypes.bonfire
+              ? buildJSChallenge
+              : buildDOMChallenge;
+
           files = files.map(createPoly);
           it('Test suite must fail on the initial contents', async function() {
             this.timeout(5000 * tests.length + 1000);
@@ -353,7 +351,7 @@ function populateTestsForLang({ lang, challenges }, meta) {
               testRunner = await createTestRunner(
                 { ...challenge, files },
                 '',
-                page
+                buildChallenge
               );
             } catch {
               fails = true;
@@ -390,7 +388,7 @@ function populateTestsForLang({ lang, challenges }, meta) {
                 const testRunner = await createTestRunner(
                   { ...challenge, files },
                   solution,
-                  page
+                  buildChallenge
                 );
                 for (const test of tests) {
                   await testRunner(test);
@@ -404,41 +402,29 @@ function populateTestsForLang({ lang, challenges }, meta) {
   });
 }
 
-async function createTestRunnerForDOMChallenge(
+async function createTestRunner(
   { required = [], template, files },
   solution,
-  context
+  buildChallenge
 ) {
   if (solution) {
     files[0].contents = solution;
   }
 
-  const { build, sources, loadEnzyme } = await buildDOMChallenge({
+  const { build, sources, loadEnzyme } = await buildChallenge({
     files,
     required,
     template
   });
+  const code = sources && 'index' in sources ? sources['index'] : '';
 
-  await context.reload();
-  await context.setContent(build);
-  await context.evaluate(
-    async (sources, loadEnzyme) => {
-      const code = sources && 'index' in sources ? sources['index'] : '';
-      const getUserInput = fileName => sources[fileName];
-      await document.__initTestFrame({ code, getUserInput, loadEnzyme });
-    },
-    sources,
-    loadEnzyme
-  );
+  const evaluator = await (buildChallenge === buildDOMChallenge
+    ? getContextEvaluator(build, sources, code, loadEnzyme)
+    : getWorkerEvaluator(build, sources, code));
 
   return async ({ text, testString }) => {
     try {
-      const { pass, err } = await Promise.race([
-        new Promise((_, reject) => setTimeout(() => reject('timeout'), 5000)),
-        await context.evaluate(async testString => {
-          return await document.__runTest(testString);
-        }, testString)
-      ]);
+      const { pass, err } = await evaluator.evaluate(testString, 5000);
       if (!pass) {
         throw new AssertionError(err.message);
       }
@@ -448,30 +434,45 @@ async function createTestRunnerForDOMChallenge(
   };
 }
 
-async function createTestRunnerForJSChallenge({ files }, solution) {
-  if (solution) {
-    files[0].contents = solution;
-  }
+async function getContextEvaluator(build, sources, code, loadEnzyme) {
+  await initializeTestRunner(build, sources, code, loadEnzyme);
 
-  const { build, sources } = await buildJSChallenge({ files });
-  const code = sources && 'index' in sources ? sources['index'] : '';
-
-  const testWorker = createWorker(testEvaluator, { terminateWorker: true });
-  return async ({ text, testString }) => {
-    try {
-      const { pass, err } = await testWorker.execute(
-        { testString, build, code, sources },
-        5000
-      ).done;
-      if (!pass) {
-        throw new AssertionError(err.message);
-      }
-    } catch (err) {
-      reThrow(err, text);
-    }
+  return {
+    evaluate: async (testString, timeout) =>
+      Promise.race([
+        new Promise((_, reject) =>
+          setTimeout(() => reject('timeout'), timeout)
+        ),
+        await page.evaluate(async testString => {
+          return await document.__runTest(testString);
+        }, testString)
+      ])
   };
 }
 
+async function getWorkerEvaluator(build, sources, code) {
+  const testWorker = createWorker(testEvaluator, { terminateWorker: true });
+  return {
+    evaluate: async (testString, timeout) =>
+      await testWorker.execute({ testString, build, code, sources }, timeout)
+        .done
+  };
+}
+
+async function initializeTestRunner(build, sources, code, loadEnzyme) {
+  await page.reload();
+  await page.setContent(build);
+  await page.evaluate(
+    async (code, sources, loadEnzyme) => {
+      const getUserInput = fileName => sources[fileName];
+      await document.__initTestFrame({ code, getUserInput, loadEnzyme });
+    },
+    code,
+    sources,
+    loadEnzyme
+  );
+}
+
 function reThrow(err, text) {
   if (typeof err === 'string') {
     throw new AssertionError(
diff --git a/client/utils/blockNameify.js b/utils/block-nameify.js
similarity index 100%
rename from client/utils/blockNameify.js
rename to utils/block-nameify.js
diff --git a/client/src/templates/Challenges/utils/polyvinyl.js b/utils/polyvinyl.js
similarity index 76%
rename from client/src/templates/Challenges/utils/polyvinyl.js
rename to utils/polyvinyl.js
index dd2594ff36..cc725f65fb 100644
--- a/client/src/templates/Challenges/utils/polyvinyl.js
+++ b/utils/polyvinyl.js
@@ -1,14 +1,17 @@
 // originally based off of https://github.com/gulpjs/vinyl
-import invariant from 'invariant';
-import { of, from, isObservable } from 'rxjs';
-import { map, switchMap } from 'rxjs/operators';
+const invariant = require('invariant');
+const { of, from, isObservable } = require('rxjs');
+const { map, switchMap } = require('rxjs/operators');
 
-export const isPromise = value =>
-  value &&
-  typeof value.subscribe !== 'function' &&
-  typeof value.then === 'function';
+function isPromise(value) {
+  return (
+    value &&
+    typeof value.subscribe !== 'function' &&
+    typeof value.then === 'function'
+  );
+}
 
-export function castToObservable(maybe) {
+function castToObservable(maybe) {
   if (isObservable(maybe)) {
     return maybe;
   }
@@ -21,7 +24,7 @@ export function castToObservable(maybe) {
 // createFileStream(
 //   files: [...PolyVinyl]
 // ) => Observable[...Observable[...PolyVinyl]]
-export function createFileStream(files = []) {
+function createFileStream(files = []) {
   return of(from(files));
 }
 
@@ -30,7 +33,7 @@ export function createFileStream(files = []) {
 //    file: PolyVinyl
 //  ) => PolyVinyl|Observable[PolyVinyl]|Promise[PolyVinyl]
 // ) => Observable[...Observable[...PolyVinyl]]
-export function pipe(project) {
+function pipe(project) {
   const source = this;
   return source.pipe(
     map(files => {
@@ -58,7 +61,7 @@ export function pipe(project) {
 //   contents: String,
 //   history?: [...String],
 // }) => PolyVinyl, throws
-export function createPoly({ name, ext, contents, history, ...rest } = {}) {
+function createPoly({ name, ext, contents, history, ...rest } = {}) {
   invariant(typeof name === 'string', 'name must be a string but got %s', name);
 
   invariant(typeof ext === 'string', 'ext must be a string, but was %s', ext);
@@ -82,7 +85,7 @@ export function createPoly({ name, ext, contents, history, ...rest } = {}) {
 }
 
 // isPoly(poly: Any) => Boolean
-export function isPoly(poly) {
+function isPoly(poly) {
   return (
     poly &&
     typeof poly.contents === 'string' &&
@@ -93,7 +96,7 @@ export function isPoly(poly) {
 }
 
 // checkPoly(poly: Any) => Void, throws
-export function checkPoly(poly) {
+function checkPoly(poly) {
   invariant(
     isPoly(poly),
     'function should receive a PolyVinyl, but got %s',
@@ -102,14 +105,14 @@ export function checkPoly(poly) {
 }
 
 // isEmpty(poly: PolyVinyl) => Boolean, throws
-export function isEmpty(poly) {
+function isEmpty(poly) {
   checkPoly(poly);
   return !!poly.contents;
 }
 
 // setContent(contents: String, poly: PolyVinyl) => PolyVinyl
 // setContent will loose source if set
-export function setContent(contents, poly) {
+function setContent(contents, poly) {
   checkPoly(poly);
   return {
     ...poly,
@@ -119,7 +122,7 @@ export function setContent(contents, poly) {
 }
 
 // setExt(ext: String, poly: PolyVinyl) => PolyVinyl
-export function setExt(ext, poly) {
+function setExt(ext, poly) {
   checkPoly(poly);
   const newPoly = {
     ...poly,
@@ -132,7 +135,7 @@ export function setExt(ext, poly) {
 }
 
 // setName(name: String, poly: PolyVinyl) => PolyVinyl
-export function setName(name, poly) {
+function setName(name, poly) {
   checkPoly(poly);
   const newPoly = {
     ...poly,
@@ -145,7 +148,7 @@ export function setName(name, poly) {
 }
 
 // setError(error: Object, poly: PolyVinyl) => PolyVinyl
-export function setError(error, poly) {
+function setError(error, poly) {
   invariant(
     typeof error === 'object',
     'error must be an object or null, but got %',
@@ -159,7 +162,7 @@ export function setError(error, poly) {
 }
 
 // clearHeadTail(poly: PolyVinyl) => PolyVinyl
-export function clearHeadTail(poly) {
+function clearHeadTail(poly) {
   checkPoly(poly);
   return {
     ...poly,
@@ -169,7 +172,7 @@ export function clearHeadTail(poly) {
 }
 
 // appendToTail (tail: String, poly: PolyVinyl) => PolyVinyl
-export function appendToTail(tail, poly) {
+function appendToTail(tail, poly) {
   checkPoly(poly);
   return {
     ...poly,
@@ -178,7 +181,7 @@ export function appendToTail(tail, poly) {
 }
 
 // compileHeadTail(padding: String, poly: PolyVinyl) => PolyVinyl
-export function compileHeadTail(padding = '', poly) {
+function compileHeadTail(padding = '', poly) {
   return clearHeadTail(
     transformContents(
       () => [poly.head, poly.contents, poly.tail].join(padding),
@@ -195,7 +198,7 @@ export function compileHeadTail(padding = '', poly) {
 // code in the `source` property. If the original polyvinyl
 // already contains a source, this version will continue as
 // the source property
-export function transformContents(wrap, poly) {
+function transformContents(wrap, poly) {
   const newPoly = setContent(wrap(poly.contents), poly);
   // if no source exist, set the original contents as source
   newPoly.source = poly.source || poly.contents;
@@ -206,7 +209,7 @@ export function transformContents(wrap, poly) {
 //   wrap: (source: String) => String,
 //   poly: PolyVinyl
 // ) => PolyVinyl
-export function transformHeadTailAndContents(wrap, poly) {
+function transformHeadTailAndContents(wrap, poly) {
   return {
     ...transformContents(wrap, poly),
     head: wrap(poly.head),
@@ -214,10 +217,32 @@ export function transformHeadTailAndContents(wrap, poly) {
   };
 }
 
-export function testContents(predicate, poly) {
+function testContents(predicate, poly) {
   return !!predicate(poly.contents);
 }
 
-export function updateFileFromSpec(spec, poly) {
+function updateFileFromSpec(spec, poly) {
   return setContent(poly.contents, createPoly(spec));
 }
+
+module.exports = {
+  isPromise,
+  castToObservable,
+  createFileStream,
+  pipe,
+  createPoly,
+  isPoly,
+  checkPoly,
+  isEmpty,
+  setContent,
+  setExt,
+  setName,
+  setError,
+  clearHeadTail,
+  appendToTail,
+  compileHeadTail,
+  transformContents,
+  transformHeadTailAndContents,
+  testContents,
+  updateFileFromSpec
+};