Initial change from Babel/JS to TypeScript (#70)

* will compile as typescript

* migrated test suite to use JestJS

* Migrated to Jest testing framework and typescript source files

* updated deps

* updated prepublish

* resolved 1 failing test

* changed decimal .0 on four tests, it appears that these were the only four tests expecting integer values to have '.0'

* added linter

* added package-lock

* removed tslint in favor of eslint

* changed yarn to npm

* updated version 2.6->3.0

* removing package lock

* updated node version in nvmrc and jest version in package

* removed nvmrc

* removed some unused functions

* replaced data driven with file from master

* commitint yarn.lock

* removing babel as a dependency in favor of typescript compiling to es5

* removing babel deps

* resolved testing issues by migrating helper function

* added partial linting functionality for test suite

* updated imports for decodeLedgerData

* updated test

* updated yarn.lock

* removed a console.log

* added eslint-jest-plugin to package

* reverting to old linting, will add linting in next PR

* removed comments in shamap

* re-adding .nvmrc

* npm -> yarn

* added . to .eslintrc

* added .eslintrc

* removing linting for this PR

* Changed linting to print a message so that linting doesnt fail in CI

* changing back

* added newline so diff wont show

* removed eslint deps, since linting will be dealt with in a later PR

* changed function calls to describe(...)

packages/ripple-binary-codec/test/quality.test.js

@@ -0,0 +1,15 @@
+const { quality, binary } = require('../dist/coretypes')
+
+describe('Quality encode/decode', function () {
+  const bookDirectory =
+    '4627DFFCFF8B5A265EDBD8AE8C14A52325DBFEDAF4F5C32E5D06F4C3362FE1D0'
+  const expectedQuality = '195796912.5171664'
+  test('can decode', function () {
+    const decimal = quality.decode(bookDirectory)
+    expect(decimal.toString()).toBe(expectedQuality)
+  })
+  test('can encode', function () {
+    const bytes = quality.encode(expectedQuality)
+    expect(binary.bytesToHex(bytes)).toBe(bookDirectory.slice(-16))
+  })
+})