Squelch Rollup warnings.

Author: mbostock

rollup.config.js

@@ -5,14 +5,20 @@ import * as meta from "./package.json";
 
 const copyright = `// ${meta.homepage} v${meta.version} Copyright ${(new Date).getFullYear()} ${meta.author.name}`;
 
+function onwarn(message, warn) {
+  if (message.code === "CIRCULAR_DEPENDENCY") return;
+  warn(message);
+}
+
 export default [
   {
     input: "index.js",
     external: Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key)),
     output: {
       file: "dist/d3.node.js",
       format: "cjs"
-    }
+    },
+    onwarn
   },
   {
     input: "index.js",
@@ -27,7 +33,8 @@ export default [
       format: "umd",
       indent: false,
       name: "d3"
-    }
+    },
+    onwarn
   },
   {
     input: "index.js",
@@ -42,6 +49,7 @@ export default [
       format: "umd",
       indent: false,
       name: "d3"
-    }
+    },
+    onwarn
   }
 ];