Repository: ViacomInc/data-point (js)

Issue:
Document what's exported on the DataPoint object
**Problem description:**

It's not clear what methods/properties are available on the DataPoint object.

```js
const DataPoint = require('data-point')
```
For example, `DataPoint.createEntity` is used in a readme example, but that method is never documented.

**Suggested solution:**

1. Add this info to the readme

2. Refactor `lib/index.js` to make it clear what's being exported. Currently it does this:

https://github.com/ViacomInc/data-point/blob/28b6ed9766164eddbc455dff5f4a86c17d930bfc/packages/data-point/lib/index.js#L4

...and `./helpers`, which it's pointing to, does the same thing...

https://github.com/ViacomInc/data-point/blob/28b6ed9766164eddbc455dff5f4a86c17d930bfc/packages/data-point/lib/helpers/index.js#L3

...but listing the exports by name would make these files more understandable:

```js
// rough example...

module.exports = {
  create: require('./core').create,
  inspect: require('./helpers').inspect
  // and so on
}
```

Pull request description:
 feat(data-point): explicitly expose set of methods to main API
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<!-- What changes are being made? (What feature/bug is being fixed here?) -->
**What**: #80

<!-- Why are these changes necessary? -->
**Why**: closes #80

<!-- How were these changes implemented? -->
**How**: explicitly exposing methods

<!-- Have you done all of these things?  -->
**Checklist**:
<!-- add "N/A" to the end of each line that's irrelevant to your changes -->
<!-- to check an item, place an "x" in the box like so: "- [x] Documentation" -->
- [ ] Documentation
- [X] Tests
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- [ ] Added username to **all-contributors** list

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Patch:
diff --git a/packages/data-point/examples/custom-entity-type.js b/packages/data-point/examples/custom-entity-type.js
index e95f4f8..fa4e02d 100644
--- a/packages/data-point/examples/custom-entity-type.js
+++ b/packages/data-point/examples/custom-entity-type.js
@@ -33,10 +33,12 @@ function resolve (accumulator, resolveReducer) {
   return resolveReducer(accumulator, spec.value).then(acc => {
     // execute lodash template against
     // accumulator value
-    const output = spec.template(acc.value)
+    const value = spec.template(acc.value)
     // set new accumulator.value
     // this method creates a new acc object
-    return DataPoint.set(acc, 'value', output)
+    return Object.assign({}, acc, {
+      value
+    })
   })
 }
 
diff --git a/packages/data-point/lib/index.js b/packages/data-point/lib/index.js
index 3749dc9..c467ba9 100644
--- a/packages/data-point/lib/index.js
+++ b/packages/data-point/lib/index.js
@@ -1,3 +1,14 @@
 /* eslint global-require: 0 */
 
-module.exports = Object.assign({}, require('./core'), require('./helpers'))
+const core = require('./core')
+const helpers = require('./helpers')
+
+module.exports = {
+  create: core.create,
+  helpers: helpers.helpers,
+  createEntity: helpers.createEntity,
+  resolveEntity: helpers.resolveEntity,
+  reducify: helpers.reducify,
+  reducifyAll: helpers.reducifyAll,
+  createReducerResolver: helpers.reducifyAll
+}


Test patch:
diff --git a/packages/data-point/lib/__snapshots__/index.test.js.snap b/packages/data-point/lib/__snapshots__/index.test.js.snap
new file mode 100644
index 0000000..19d6e79
--- /dev/null
+++ b/packages/data-point/lib/__snapshots__/index.test.js.snap
@@ -0,0 +1,20 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`lib It should explicity expose set of methods 1`] = `
+Object {
+  "create": [Function],
+  "createEntity": [Function],
+  "createReducerResolver": [Function],
+  "helpers": Object {
+    "assign": [Function],
+    "filter": [Function],
+    "find": [Function],
+    "map": [Function],
+    "omit": [Function],
+    "pick": [Function],
+  },
+  "reducify": [Function],
+  "reducifyAll": [Function],
+  "resolveEntity": [Function],
+}
+`;
diff --git a/packages/data-point/lib/index.test.js b/packages/data-point/lib/index.test.js
new file mode 100644
index 0000000..b283cc3
--- /dev/null
+++ b/packages/data-point/lib/index.test.js
@@ -0,0 +1,11 @@
+/* eslint-env jest */
+
+const lib = require('./index')
+
+describe('lib', () => {
+  // this test here is mainly to be aware of any new method that gets added
+  // to the main API
+  test('It should explicity expose set of methods', () => {
+    expect(lib).toMatchSnapshot()
+  })
+})