feat: process.env fallback object for browsers usage

.eslintrc

@@ -11,6 +11,7 @@
     "no-loop-func": 0,
     "new-cap": 0,
     "prefer-destructuring": 0,
+    "block-scoped-var": 0,
     "import/no-extraneous-dependencies": [
       "error",
       {

src/define.js

@@ -4,6 +4,9 @@ import render from './render';
 import * as cache from './cache';
 import { dispatch, pascalToDash } from './utils';
 
+// eslint-disable-next-line
+try { process.env.NODE_ENV } catch(e) { var process = { env: { NODE_ENV: 'production' } }; }
+
 function dispatchInvalidate(host) {
   dispatch(host, '@invalidate', { bubbles: true, composed: true });
 }

src/template/core.js

@@ -4,6 +4,9 @@ import { dataMap, removeTemplate } from './utils';
 import resolveValue from './resolvers/value';
 import resolveProperty from './resolvers/property';
 
+// eslint-disable-next-line
+try { process.env.NODE_ENV } catch(e) { var process = { env: { NODE_ENV: 'production' } }; }
+
 const TIMESTAMP = Date.now();
 
 export const getPlaceholder = (id = 0) => `{{h-${TIMESTAMP}-${id}}}`;