fix(build): no longer publishing "module" either

Giving up on this: there isn't a great reason to publish modules
here as they won't be significantly tree-shook, and it bloats
the published package.

Fixes incompatiblity in 4.4.0 with webpack, where webpack is now
selecting "module" because "browser" is no longer present.

.babelrc.js

@@ -1,18 +1,11 @@
 'use strict';
 
-// If set, we put Babel in "esmMode", i.e. leave import/export intact.
-// Good for webpack and for an esm build.
-const esmMode = process.env.BABEL_MODULE_TYPE === "module";
-const es6Compat = process.env.BABEL_ES_COMPAT === "6";
-
 module.exports = {
   "presets": [
     [
       "@babel/preset-env",
       {
-        // Don't transpile import/export in esmMode.
-        modules: esmMode ? false : "auto",
-        targets: es6Compat ? "maintained node versions" : undefined
+        targets: "> 0.25%, not dead"
       },
     ],
     "@babel/react",

Makefile

@@ -21,9 +21,6 @@ build: clean build-cjs build-esm build-web
 build-cjs: $(BIN)
 	$(BIN)/babel --out-dir ./build/cjs ./lib
 
-build-esm: $(BIN)
-	env BABEL_MODULE_TYPE="module" BABEL_ES_COMPAT="6" $(BIN)/babel --out-dir ./build/module ./lib
-
 build-web: $(BIN)
 	$(BIN)/webpack --mode=production --display-modules
 

karma-phantomjs.conf.js

@@ -1,8 +1,6 @@
 'use strict';
 
 const baseConfig = require('./karma.conf.js');
-// Phantom build can't handle the modern JS in the module build
-process.env.BABEL_MODULE_TYPE = 'cjs';
 
 module.exports = function(config) {
   // Set base config options.

webpack.config.js

@@ -1,11 +1,6 @@
 const path = require('path');
 const webpack = require('webpack');
 
-// Grabbed in .babelrc.js to switch on transpiling modules.
-// We want webpack to handle modules if possible.
-// This can be overridden and webpack will handle babelified CJS.
-process.env.BABEL_MODULE_TYPE = process.env.BABEL_MODULE_TYPE || 'module';
-
 module.exports = (env, argv) => ({
 	entry: {
     'react-draggable.min': './lib/cjs.js',