feat: exported Drop interface for #107

Deprecate snake_cased options and APIs, sed #109

test/unit/scope/scope.ts

@@ -181,11 +181,11 @@ describe('scope', function () {
       expect(scope.get('foo')).to.equal('bar')
     })
   })
-  describe('strict_variables', function () {
+  describe('strictVariables', function () {
     let scope: Scope
     beforeEach(function () {
       scope = new Scope(ctx, {
-        strict_variables: true
+        strictVariables: true
       } as any)
     })
     it('should throw when variable not defined', function () {