Add code-server alias to eslint

.eslintrc.yaml

@@ -35,7 +35,7 @@ rules:
     [error, { alphabetize: { order: "asc" }, groups: [["builtin", "external", "internal"], "parent", "sibling"] }]
   no-async-promise-executor: off
   # This isn't a real module, just types, which apparently doesn't resolve.
-  import/no-unresolved: [error, { ignore: ["express-serve-static-core", "code-server"] }]
+  import/no-unresolved: [error, { ignore: ["express-serve-static-core"] }]
 
 settings:
   # Does not work with CommonJS unfortunately.

test/test-plugin/.eslintrc.yaml

+settings:
+  import/resolver:
+    alias:
+      map:
+        - [code-server, ../../typings/pluginapi.d.ts]