drop rollup to v1 for node8

package-lock.json

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+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
+      "dev": true
+    },
     "typescript": {
       "version": "3.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.3.tgz",
       "integrity": "sha512-D/wqnB2xzNFIcoBG9FG8cXRDjiqSTbG2wd8DMZeQyJlP1vfTkIxH4GKveWaEBYySKIg+USu+E+EDIR47SqnaMQ==",
       "dev": true
     },
-    "unbzip2-stream": {
-      "version": "1.4.2",
-      "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.4.2.tgz",
-      "integrity": "sha512-pZMVAofMrrHX6Ik39hCk470kulCbmZ2SWfQLPmTWqfJV/oUm0gn1CblvHdUu4+54Je6Jq34x8kY6XjTy6dMkOg==",
-      "dev": true,
-      "requires": {
-        "buffer": "^5.2.1",
-        "through": "^2.3.8"
-      }
-    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",

package.json

@@ -94,7 +94,7 @@
     "mocha": "^7.1.2",
     "periscopic": "^2.0.1",
     "puppeteer": "^2.1.1",
-    "rollup": "^2.10.5",
+    "rollup": "^1.32.1",
     "source-map-support": "^0.5.19",
     "source-map": "^0.7.3",
     "tslib": "^2.0.0",

rollup.config.js

@@ -65,7 +65,7 @@ export default [
 				}),
 				ts_plugin,
 				{
-					writeBundle(_options, bundle) {
+					writeBundle(bundle) {
 						if (dir === 'internal') {
 							const mod = bundle['index.mjs'];
 							if (mod) {