diff --git a/src/legacy/core_plugins/data/public/expressions/index.ts b/src/legacy/core_plugins/data/public/expressions/index.ts
index ae51804a85fb5..707bcd3cd883e 100644
--- a/src/legacy/core_plugins/data/public/expressions/index.ts
+++ b/src/legacy/core_plugins/data/public/expressions/index.ts
@@ -19,3 +19,4 @@
 
 export { ExpressionsService, ExpressionsSetup, ExpressionsStart } from './expressions_service';
 export { ExpressionRenderer, ExpressionRendererProps } from './expression_renderer';
+export { IInterpreterRenderFunction } from './lib/_types';
diff --git a/src/legacy/core_plugins/expressions/public/index.ts b/src/legacy/core_plugins/expressions/public/index.ts
new file mode 100644
index 0000000000000..6c6e72fb2aa5a
--- /dev/null
+++ b/src/legacy/core_plugins/expressions/public/index.ts
@@ -0,0 +1,30 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+// /// Define plugin function
+import { ExpressionsPlugin as Plugin } from './plugin';
+
+export function plugin() {
+  return new Plugin();
+}
+
+// /// Export types & static code
+
+/** @public types */
+export * from './expressions';
diff --git a/src/legacy/core_plugins/expressions/public/mocks.ts b/src/legacy/core_plugins/expressions/public/mocks.ts
new file mode 100644
index 0000000000000..42ec5bfb5ba65
--- /dev/null
+++ b/src/legacy/core_plugins/expressions/public/mocks.ts
@@ -0,0 +1,37 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { ExpressionsSetup, ExpressionsStart } from '.';
+
+function createExpressionsSetupMock() {
+  const mock: MockedKeys<Partial<ExpressionsSetup>> = {};
+
+  return mock;
+}
+
+function createExpressionsStartMock() {
+  const mock: MockedKeys<Partial<ExpressionsStart>> = {};
+
+  return mock;
+}
+
+export const expressionsPluginMock = {
+  createSetup: createExpressionsSetupMock,
+  createStart: createExpressionsStartMock,
+};
diff --git a/src/legacy/core_plugins/expressions/public/plugin.ts b/src/legacy/core_plugins/expressions/public/plugin.ts
new file mode 100644
index 0000000000000..b954238c05e59
--- /dev/null
+++ b/src/legacy/core_plugins/expressions/public/plugin.ts
@@ -0,0 +1,72 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { CoreSetup, CoreStart, Plugin } from '../../../../core/public';
+import { ExpressionsService, ExpressionsSetup, ExpressionsStart } from './expressions';
+import {
+  Start as InspectorStart,
+  Setup as InspectorSetup,
+} from '../../../../plugins/inspector/public';
+
+/**
+ * Interface for any dependencies on other plugins' `setup` contracts.
+ *
+ * @internal
+ */
+export interface ExpressionsPluginSetupDependencies {
+  inspector: InspectorSetup;
+}
+
+export interface ExpressionsPluginStartDependencies {
+  inspector: InspectorStart;
+}
+
+/**
+ * Interface for this plugin's returned `setup` contract.
+ *
+ * @public
+ */
+
+export class ExpressionsPlugin
+  implements
+    Plugin<
+      ExpressionsSetup,
+      ExpressionsStart,
+      ExpressionsPluginSetupDependencies,
+      ExpressionsPluginStartDependencies
+    > {
+  // Exposed services, sorted alphabetically
+  private readonly expressions: ExpressionsService = new ExpressionsService();
+
+  public setup(core: CoreSetup): ExpressionsSetup {
+    return {
+      ...this.expressions.setup(),
+    };
+  }
+
+  public start(core: CoreStart, plugins: ExpressionsPluginStartDependencies): ExpressionsStart {
+    return {
+      ...this.expressions.start({ inspector: plugins.inspector }),
+    };
+  }
+
+  public stop() {
+    this.expressions.stop();
+  }
+}