try to fix rollup ts declarations

config/rollup/rollup.config.js

@@ -45,6 +45,9 @@ function configure(pkg, env, target) {
     typescript({
       abortOnError: false,
       tsconfig: `./packages/${pkg.name}/tsconfig.json`,
+      // COMPAT: Without this flag sometimes the declarations are not updated.
+      // clean: isProd ? true : false,
+      clean: true,
     }),
 
     // Allow Rollup to resolve CommonJS modules, since it only resolves ES2015

packages/slate-history/package.json

@@ -30,7 +30,6 @@
   "keywords": [
     "editor",
     "history",
-    "merge",
     "operation",
     "redo",
     "save",

packages/slate-hyperscript/package.json

@@ -33,7 +33,6 @@
     "jsx",
     "serialize",
     "slate",
-    "sugar",
     "xml"
   ]
 }

packages/slate-react/package.json

@@ -40,7 +40,6 @@
   "keywords": [
     "canvas",
     "contenteditable",
-    "doc",
     "docs",
     "document",
     "edit",

packages/slate-schema/package.json

@@ -25,7 +25,6 @@
   },
   "keywords": [
     "content",
-    "customize",
     "editor",
     "enforce",
     "normalize",

packages/slate/package.json

@@ -23,6 +23,7 @@
   "keywords": [
     "canvas",
     "contenteditable",
+    "custom",
     "document",
     "edit",
     "editor",