Try @babel/core 7.13.0

package.json

@@ -40,7 +40,7 @@
     "test:node:debug": "mocha debug node-tests"
   },
   "dependencies": {
-    "@babel/core": "7.12.0",
+    "@babel/core": "7.13.0",
     "@babel/helper-compilation-targets": "^7.12.0",
     "@babel/plugin-proposal-class-properties": "^7.13.0",
     "@babel/plugin-proposal-decorators": "^7.13.5",

yarn.lock

@@ -26,7 +26,29 @@
   resolved "https://registry.yarnpkg.com/@babel/compat-data/-/compat-data-7.13.8.tgz#5b783b9808f15cef71547f1b691f34f8ff6003a6"
   integrity sha512-EaI33z19T4qN3xLXsGf48M2cDqa6ei9tPZlfLdb2HC+e/cFtREiRd8hdSqDbwdLB0/+gLwqJmCYASH0z2bUdog==
 
-"@babel/[email protected]", "@babel/core@^7.12.0", "@babel/core@^7.3.4", "@babel/core@^7.7.0":
+"@babel/[email protected]":
+  version "7.13.0"
+  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.13.0.tgz#5d61713de310dcfb09258b9fbd081c90623a9548"
+  integrity sha512-aiv4TeB1i0y3E/+be4U4xtb21CvidNbBegcxvVOrM2B5HfKwwCbYdhGbZUtzeV4HkNevRMLx7oSgQ9bjl4WhXw==
+  dependencies:
+    "@babel/code-frame" "^7.12.13"
+    "@babel/generator" "^7.13.0"
+    "@babel/helper-compilation-targets" "^7.13.0"
+    "@babel/helper-module-transforms" "^7.13.0"
+    "@babel/helpers" "^7.13.0"
+    "@babel/parser" "^7.13.0"
+    "@babel/template" "^7.12.13"
+    "@babel/traverse" "^7.13.0"
+    "@babel/types" "^7.13.0"
+    convert-source-map "^1.7.0"
+    debug "^4.1.0"
+    gensync "^1.0.0-beta.2"
+    json5 "^2.1.2"
+    lodash "^4.17.19"
+    semver "7.0.0"
+    source-map "^0.5.0"
+
+"@babel/core@^7.12.0", "@babel/core@^7.3.4", "@babel/core@^7.7.0":
   version "7.12.0"
   resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.12.0.tgz#e42e07a086e978cdd4c61f4078d8230fb817cc86"
   integrity sha512-iV7Gwg0DePKvdDZZWRTkj4MW+6/AbVWd4ZCg+zk8H1RVt5xBpUZS6vLQWwb3pyLg4BFTaGiQCPoJ4Ibmbne4fA==
@@ -384,6 +406,15 @@
     "@babel/traverse" "^7.10.4"
     "@babel/types" "^7.10.4"
 
+"@babel/helpers@^7.13.0":
+  version "7.13.0"
+  resolved "https://registry.yarnpkg.com/@babel/helpers/-/helpers-7.13.0.tgz#7647ae57377b4f0408bf4f8a7af01c42e41badc0"
+  integrity sha512-aan1MeFPxFacZeSz6Ld7YZo5aPuqnKlD7+HZY75xQsueczFccP9A7V05+oe0XpLwHK3oLorPe9eaAUljL7WEaQ==
+  dependencies:
+    "@babel/template" "^7.12.13"
+    "@babel/traverse" "^7.13.0"
+    "@babel/types" "^7.13.0"
+
 "@babel/highlight@^7.10.4", "@babel/highlight@^7.12.13":
   version "7.13.8"
   resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.13.8.tgz#10b2dac78526424dfc1f47650d0e415dfd9dc481"
@@ -5610,6 +5641,11 @@ gensync@^1.0.0-beta.1:
   resolved "https://registry.yarnpkg.com/gensync/-/gensync-1.0.0-beta.1.tgz#58f4361ff987e5ff6e1e7a210827aa371eaac269"
   integrity sha512-r8EC6NO1sngH/zdD9fiRDLdcgnbayXah+mLgManTaIZJqEC1MZstmnox8KpnI2/fxQwrp5OpCOYWLp4rBl4Jcg==
 
+gensync@^1.0.0-beta.2:
+  version "1.0.0-beta.2"
+  resolved "https://registry.yarnpkg.com/gensync/-/gensync-1.0.0-beta.2.tgz#32a6ee76c3d7f52d46b2b1ae5d93fea8580a25e0"
+  integrity sha512-3hN7NaskYvMDLQY55gnW3NQ+mesEAepTqlg+VEbj7zzqEMBVNhzcGYYeqFo/TlYz6eQiFcp1HcsCZO+nGgS8zg==
+
 get-caller-file@^1.0.0, get-caller-file@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-1.0.3.tgz#f978fa4c90d1dfe7ff2d6beda2a515e713bdcf4a"