Revert changes to core mode.

jupyterlab/staging/package.json

@@ -67,7 +67,7 @@
     "@jupyterlab/tooltip": "^0.16.2",
     "@jupyterlab/tooltip-extension": "^0.16.2",
     "@jupyterlab/vdom-extension": "^0.15.7",
-    "@jupyterlab/vega4-extension": "^0.15.2",
+    "@jupyterlab/vega3-extension": "^0.15.2",
     "@phosphor/algorithm": "^1.1.2",
     "@phosphor/application": "^1.5.0",
     "@phosphor/commands": "^1.4.0",
@@ -150,7 +150,7 @@
       "@jupyterlab/json-extension": "",
       "@jupyterlab/pdf-extension": "",
       "@jupyterlab/vdom-extension": "",
-      "@jupyterlab/vega4-extension": ""
+      "@jupyterlab/vega3-extension": ""
     },
     "name": "JupyterLab",
     "buildDir": "./build",

jupyterlab/staging/yarn.lock

@@ -753,9 +753,9 @@
     react "~16.2.0"
     react-dom "~16.2.0"
 
-"@jupyterlab/vega4-extension@^0.15.2":
+"@jupyterlab/vega3-extension@^0.15.2":
   version "0.15.2"
-  resolved "https://registry.npmjs.org/@jupyterlab/vega4-extension/-/vega4-extension-0.15.2.tgz#a35e43cde38d7d801d00399a62b1bed4e45fa926"
+  resolved "https://registry.npmjs.org/@jupyterlab/vega3-extension/-/vega3-extension-0.15.2.tgz#a35e43cde38d7d801d00399a62b1bed4e45fa926"
   dependencies:
     "@jupyterlab/rendermime-interfaces" "^1.0.9"
     "@phosphor/coreutils" "^1.3.0"

packages/rendermime-interfaces/README.md

@@ -11,4 +11,4 @@ When using these interfaces, extensions only need to provide some metadata about
 wht kind of mime bundle they are able to render, and a `Widget` with
 a `renderModel` method that renders the mime bundle.
 
-Examples can be found in [@jupyterlab/vega-extension](../vega-extension) and [@jupyterlab/pdf-extension](../pdf-extension).
+Examples can be found in [@jupyterlab/vega4-extension](../vega4-extension) and [@jupyterlab/pdf-extension](../pdf-extension).