Rewrite in typescript and actually evaluate the AST instead of evaling

.gitignore

@@ -11,3 +11,5 @@ logs
 results
 npm-debug.log
 node_modules
+lib
+yarn.lock

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "bracketSpacing": false,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

package.json

@@ -1,21 +1,29 @@
 {
   "name": "constantinople",
   "version": "3.1.0",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
   "description": "Determine whether a JavaScript expression evaluates to a constant (using acorn)",
   "keywords": [
     "acorn",
     "ast",
     "tooling"
   ],
   "dependencies": {
+    "@types/babylon": "^6.16.2",
     "babel-types": "^6.16.0",
-    "babylon-walk": "^1.0.2",
-    "is-expression-babylon": "^1.1.0"
+    "babylon": "^6.18.0",
+    "babylon-walk": "^1.0.2"
   },
   "devDependencies": {
-    "mocha": "*"
+    "@types/node": "^9.4.4",
+    "mocha": "*",
+    "typescript": "^2.7.1"
   },
   "scripts": {
+    "prepublish": "npm run build",
+    "build": "tsc",
+    "pretest": "npm run build",
     "test": "mocha -R spec"
   },
   "repository": {

src/binaryOperation.ts

@@ -0,0 +1,76 @@
+export type Operator =
+  | '+'
+  | '-'
+  | '/'
+  | '%'
+  | '*'
+  | '**'
+  | '&'
+  | '|'
+  | '>>'
+  | '>>>'
+  | '<<'
+  | '^'
+  | '=='
+  | '==='
+  | '!='
+  | '!=='
+  | 'in'
+  | 'instanceof'
+  | '>'
+  | '<'
+  | '>='
+  | '<=';
+
+export default function binaryOperation(
+  operator: Operator,
+  left: any,
+  right: any,
+): any {
+  switch (operator) {
+    case '+':
+      return left + right;
+    case '-':
+      return left - right;
+    case '/':
+      return left / right;
+    case '%':
+      return left % right;
+    case '*':
+      return left * right;
+    case '**':
+      return left ** right;
+    case '&':
+      return left & right;
+    case '|':
+      return left | right;
+    case '>>':
+      return left >> right;
+    case '>>>':
+      return left >>> right;
+    case '<<':
+      return left << right;
+    case '^':
+      return left ^ right;
+    case '==':
+      return left == right;
+    case '===':
+      return left === right;
+    case '!=':
+      return left != right;
+    case '!==':
+      return left !== right;
+    case 'in':
+      return left in right;
+    case 'instanceof':
+      return left instanceof right;
+    case '>':
+      return left > right;
+    case '<':
+      return left < right;
+    case '>=':
+      return left >= right;
+    case '<=':
+      return left <= right;
+  }
+}