New source found from dndbeyond.com

ddb_main/node_modules/@emotion/sheet/dist/emotion-sheet.esm.js

@@ -1,3 +1,5 @@
+var isDevelopment = false;
+
 /*
 
 Based off glamor's StyleSheet, thanks Sunil ❤️
@@ -20,10 +22,9 @@ styleSheet.flush()
 - empties the stylesheet of all its contents
 
 */
-// $FlowFixMe
+
 function sheetForTag(tag) {
   if (tag.sheet) {
-    // $FlowFixMe
     return tag.sheet;
   } // this weirdness brought to you by firefox
 
@@ -32,10 +33,13 @@ function sheetForTag(tag) {
 
   for (var i = 0; i < document.styleSheets.length; i++) {
     if (document.styleSheets[i].ownerNode === tag) {
-      // $FlowFixMe
       return document.styleSheets[i];
     }
-  }
+  } // this function should always return with a value
+  // TS can't understand it though so we make it stop complaining here
+
+
+  return undefined;
 }
 
 function createStyleElement(options) {
@@ -76,7 +80,7 @@ var StyleSheet = /*#__PURE__*/function () {
       _this.tags.push(tag);
     };
 
-    this.isSpeedy = options.speedy === undefined ? process.env.NODE_ENV === 'production' : options.speedy;
+    this.isSpeedy = options.speedy === undefined ? !isDevelopment : options.speedy;
     this.tags = [];
     this.ctr = 0;
     this.nonce = options.nonce; // key is the value of the data-emotion attribute, it's used to identify different sheets
@@ -104,18 +108,6 @@ var StyleSheet = /*#__PURE__*/function () {
 
     var tag = this.tags[this.tags.length - 1];
 
-    if (process.env.NODE_ENV !== 'production') {
-      var isImportRule = rule.charCodeAt(0) === 64 && rule.charCodeAt(1) === 105;
-
-      if (isImportRule && this._alreadyInsertedOrderInsensitiveRule) {
-        // this would only cause problem in speedy mode
-        // but we don't want enabling speedy to affect the observable behavior
-        // so we report this error at all times
-        console.error("You're attempting to insert the following rule:\n" + rule + '\n\n`@import` rules must be before all other types of rules in a stylesheet but other rules have already been inserted. Please ensure that `@import` rules are before all other rules.');
-      }
-      this._alreadyInsertedOrderInsensitiveRule = this._alreadyInsertedOrderInsensitiveRule || !isImportRule;
-    }
-
     if (this.isSpeedy) {
       var sheet = sheetForTag(tag);
 
@@ -124,9 +116,6 @@ var StyleSheet = /*#__PURE__*/function () {
         // the big drawback is that the css won't be editable in devtools
         sheet.insertRule(rule, sheet.cssRules.length);
       } catch (e) {
-        if (process.env.NODE_ENV !== 'production' && !/:(-moz-placeholder|-moz-focus-inner|-moz-focusring|-ms-input-placeholder|-moz-read-write|-moz-read-only|-ms-clear|-ms-expand|-ms-reveal){/.test(rule)) {
-          console.error("There was a problem inserting the following rule: \"" + rule + "\"", e);
-        }
       }
     } else {
       tag.appendChild(document.createTextNode(rule));
@@ -136,16 +125,13 @@ var StyleSheet = /*#__PURE__*/function () {
   };
 
   _proto.flush = function flush() {
-    // $FlowFixMe
     this.tags.forEach(function (tag) {
-      return tag.parentNode && tag.parentNode.removeChild(tag);
+      var _tag$parentNode;
+
+      return (_tag$parentNode = tag.parentNode) == null ? void 0 : _tag$parentNode.removeChild(tag);
     });
     this.tags = [];
     this.ctr = 0;
-
-    if (process.env.NODE_ENV !== 'production') {
-      this._alreadyInsertedOrderInsensitiveRule = false;
-    }
   };
 
   return StyleSheet;