feat: create fns package (diegomura#1838)

Author: diegomura

.gitignore

@@ -0,0 +1 @@
+lib

README.md

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+<p align="center">
+  <img src="https://user-images.githubusercontent.com/5600341/27505816-c8bc37aa-587f-11e7-9a86-08a2d081a8b9.png" height="280px">
+</p>
+
+# @react-pdf/fns
+
+> React-pdf helper functions
+
+## How to install
+```sh
+yarn add @react-pdf/fns
+```

babel.config.js

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+module.exports = { extends: '../../babel.config.js' };

jest.config.js

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+module.exports = {
+  testRegex: 'tests/.*?(test)\\.js$',
+};

package.json

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+{
+  "name": "@react-pdf/fns",
+  "version": "0.0.0",
+  "license": "MIT",
+  "description": "React-pdf helper functions",
+  "author": "Diego Muracciole <[email protected]>",
+  "homepage": "https://github.com/diegomura/react-pdf#readme",
+  "main": "lib/index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/diegomura/react-pdf.git",
+    "directory": "packages/fns"
+  },
+  "scripts": {
+    "test": "jest",
+    "build": "rimraf ./lib && babel src --out-dir lib",
+    "watch": "rimraf ./lib && babel src --out-dir lib --watch"
+  },
+  "files": [
+    "lib"
+  ]
+}

adjust.js renamed to src/adjust.js

@@ -1,3 +1,11 @@
+/**
+ * Applies a function to the value at the given index of an array
+
+ * @param {number} index
+ * @param {function} fn
+ * @param {array} collection
+ * @returns copy of the array with the element at the given index replaced with the result of the function application.
+ */
 const adjust = (index, fn, collection) => {
   if (index >= 0 && index >= collection.length) return collection;
   if (index < 0 && Math.abs(index) > collection.length) return collection;