chore: Replace Flowtype with Typescript (#3)

Setting up the repo to run with Typescript instead of Flowtype. This required changing the initial code, updating Jest & updating ESLint.

Also:
- Set up .travis.yml
- Move eslint configuration into its own `.eslintrc.json`
- Removing Babel as its replaced by Typescript (except `babel-eslint` which is needed by `eslint-config-eventbrite`)

.gitignore

@@ -1,9 +1,6 @@
 # Logs
 logs
 *.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
 
 # Runtime data
 pids
@@ -28,9 +25,6 @@ build/Release
 node_modules/
 jspm_packages/
 
-# Typescript v1 declaration files
-typings/
-
 # Optional npm cache directory
 .npm
 
@@ -50,4 +44,8 @@ typings/
 .env
 
 # Editor configurations
-.vscode
+.vscode/
+
+# Target files
+lib/
+dist/

.npmignore

@@ -0,0 +1,20 @@
+# Configuration files
+tsconfig.json
+config
+
+# Source code
+src
+
+# Dependency directories
+node_modules
+yarn.lock
+
+# Editor settings
+.vscode
+
+# Logs
+logs
+*.log
+
+# Test files
+**/*.spec.*

.travis.yml

@@ -0,0 +1,11 @@
+language: node_js
+node_js:
+  - "node"
+  - "8"
+  - "6"
+
+# Cache dependencies in $HOME/.yarn-cache across builds
+cache: yarn
+
+# Run the the validate script with code coverage
+script: yarn run validate

config/jest-preprocess-typescript.js

@@ -0,0 +1,12 @@
+const path = require("path");
+const tsc = require("typescript");
+const tsConfig = require("../tsconfig.json");
+
+module.exports = {
+  process(src, fullPath) {
+    if (path.extname(fullPath) === ".ts") {
+      return tsc.transpile(src, tsConfig.compilerOptions, fullPath, []);
+    }
+    return src;
+  }
+};