Remove DEVELOPMENT flag since it changes Lexical behavior

In development mode, Lexical freezes the selection objects, including _cachedNodes. When your code tried to modify _cachedNodes, it threw:

  TypeError: Cannot assign to read only property '_cachedNodes' of object '#<_NodeSelection>'

Related #507 (comment)

Also, always generate source maps

Author: jorgemanrubia

app/assets/javascript/lexxy.js

@@ -11674,3 +11674,4 @@ function highlightElement(preElement) {
 }
 
 export { highlightAll };
+//# sourceMappingURL=lexxy.js.map

app/assets/javascript/lexxy.js.br

@@ -25,7 +25,7 @@
   "scripts": {
     "build": "rollup -c",
     "build:npm": "rollup -c rollup.config.npm.mjs",
-    "watch": "NODE_ENV=development rollup -wc --watch.onEnd=\"rails restart\"",
+    "watch": "rollup -wc --watch.onEnd=\"rails restart\"",
     "lint": "eslint",
     "prerelease": "yarn build:npm",
     "release": "yarn build:npm && yarn publish"

app/assets/javascript/lexxy.js.gz

@@ -17,7 +17,7 @@ export default [
       {
         file: "./app/assets/javascript/lexxy.js",
         format: "esm",
-        sourcemap: process.env.NODE_ENV === "development" // eslint-disable-line no-undef
+        sourcemap: true
       },
       {
         file: "./app/assets/javascript/lexxy.min.js",