- npm: Update from deprecated rollup-plugin-babel to @rollup/plugin-babel

(and make `babelHelpers` explicit)

package-lock.json

@@ -2173,6 +2173,35 @@
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       "dev": true
     },
+    "@rollup/plugin-babel": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-babel/-/plugin-babel-5.0.0.tgz",
+      "integrity": "sha512-YpVnwdUeVj/fDFN75Y3CAzJTMYNcqbH05SJs551wqj+BSwLT9pS3dqJrVDPYl3eH4OrI8ueiEseX5VgUn+0HLA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-module-imports": "^7.7.4",
+        "@rollup/pluginutils": "^3.0.8"
+      }
+    },
+    "@rollup/pluginutils": {
+      "version": "3.0.10",
+      "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-3.0.10.tgz",
+      "integrity": "sha512-d44M7t+PjmMrASHbhgpSbVgtL6EFyX7J4mYxwQ/c5eoaE6N2VgCgEcWVzNnwycIloti+/MpwFr8qfw+nRw00sw==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.39",
+        "estree-walker": "^1.0.1",
+        "picomatch": "^2.2.2"
+      },
+      "dependencies": {
+        "estree-walker": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-1.0.1.tgz",
+          "integrity": "sha512-1fMXF3YP4pZZVozF8j/ZLfvnR8NSIljt56UhbZ5PeeDmmGHpgpdwQt7ITlGvYaQukCvuBRMLEiKiYC+oeIg4cg==",
+          "dev": true
+        }
+      }
+    },
     "@samverschueren/stream-to-observable": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/@samverschueren/stream-to-observable/-/stream-to-observable-0.3.0.tgz",
@@ -2270,6 +2299,12 @@
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       "dev": true
     },
+    "@types/estree": {
+      "version": "0.0.39",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
+      "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
+      "dev": true
+    },
     "@types/events": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
@@ -12559,16 +12594,6 @@
         }
       }
     },
-    "rollup-plugin-babel": {
-      "version": "4.4.0",
-      "resolved": "https://registry.npmjs.org/rollup-plugin-babel/-/rollup-plugin-babel-4.4.0.tgz",
-      "integrity": "sha512-Lek/TYp1+7g7I+uMfJnnSJ7YWoD58ajo6Oarhlex7lvUce+RCKRuGRSgztDO3/MF/PuGKmUL5iTHKf208UNszw==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-module-imports": "^7.0.0",
-        "rollup-pluginutils": "^2.8.1"
-      }
-    },
     "rollup-plugin-re": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/rollup-plugin-re/-/rollup-plugin-re-1.0.7.tgz",