diff --git a/package-lock.json b/package-lock.json
index def58d4..37ea2d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "miller",
-    "version": "0.2.2",
+    "version": "0.2.3",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "miller",
-            "version": "0.2.2",
+            "version": "0.2.3",
             "license": "GPL-3.0-or-later",
             "dependencies": {
                 "chokidar": "^5.0.0",
diff --git a/package.json b/package.json
index 5076a8c..ca8fcf9 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "miller",
     "productName": "miller",
-    "version": "0.2.2",
+    "version": "0.2.3",
     "description": "Column-based code editor",
     "main": ".vite/build/main.js",
     "scripts": {
diff --git a/src/app/editor.ts b/src/app/editor.ts
index 7543ad5..3e62f5b 100644
--- a/src/app/editor.ts
+++ b/src/app/editor.ts
@@ -41,9 +41,9 @@ import { OpenFile } from "./filestate";
 import {
     findReferencesKeymap,
     formatKeymap,
-    jumpToDefinitionKeymap,
     renameKeymap,
 } from "@codemirror/lsp-client";
+import { jumpToDefinitionKeymap } from "./lsp/definition";
 
 const fixedHeightEditor = EditorView.theme({
     "&": {
diff --git a/src/app/editorgrid.ts b/src/app/editorgrid.ts
index c8b12ea..09342fa 100644
--- a/src/app/editorgrid.ts
+++ b/src/app/editorgrid.ts
@@ -77,10 +77,11 @@ const EditorWrapper = (
 const editors: Displayable[][] = vanX.reactive([[]]);
 const currentTab = van.state(0);
 
-export function addEditor(file: OpenFile) {
+export function addEditor(file: OpenFile): Editor {
     const editor = file.createEditor();
     editors[currentTab.val].push(vanX.noreactive(editor));
     editor.focus();
+    return editor;
 }
 
 export function addTab() {
diff --git a/src/app/lsp.ts b/src/app/lsp.ts
index 09d96bd..d03cbb2 100644
--- a/src/app/lsp.ts
+++ b/src/app/lsp.ts
@@ -1,7 +1,7 @@
 // Minimal LSP integration helper for the editor.
 // Keeps all LSP-specific logic in one place so it's easy to review.
 
-import { Extension, ChangeSet, TransactionSpec } from "@codemirror/state";
+import { Extension, TransactionSpec } from "@codemirror/state";
 import { EditorView } from "@codemirror/view";
 
 import {
diff --git a/src/app/lsp/definition.ts b/src/app/lsp/definition.ts
new file mode 100644
index 0000000..8342d30
--- /dev/null
+++ b/src/app/lsp/definition.ts
@@ -0,0 +1,81 @@
+import type * as lsp from "vscode-languageserver-protocol"
+import { EditorView, Command, KeyBinding } from "@codemirror/view"
+import { LSPPlugin } from "@codemirror/lsp-client";
+
+import { addEditor } from "../editorgrid";
+import { OpenFile } from "../filestate";
+
+function getDefinition(plugin: LSPPlugin, pos: number) {
+    return plugin.client.request<lsp.DefinitionParams, lsp.Location | lsp.Location[] | null>("textDocument/definition", {
+        textDocument: { uri: plugin.uri },
+        position: plugin.toPosition(pos)
+    })
+}
+
+function getDeclaration(plugin: LSPPlugin, pos: number) {
+    return plugin.client.request<lsp.DeclarationParams, lsp.Location | lsp.Location[] | null>("textDocument/declaration", {
+        textDocument: { uri: plugin.uri },
+        position: plugin.toPosition(pos)
+    })
+}
+
+function getTypeDefinition(plugin: LSPPlugin, pos: number) {
+    return plugin.client.request<lsp.TypeDefinitionParams, lsp.Location | lsp.Location[] | null>("textDocument/typeDefinition", {
+        textDocument: { uri: plugin.uri },
+        position: plugin.toPosition(pos)
+    })
+}
+
+function getImplementation(plugin: LSPPlugin, pos: number) {
+    return plugin.client.request<lsp.ImplementationParams, lsp.Location | lsp.Location[] | null>("textDocument/implementation", {
+        textDocument: { uri: plugin.uri },
+        position: plugin.toPosition(pos)
+    })
+}
+
+function jumpToOrigin(view: EditorView, type: { get: typeof getDefinition, capability: keyof lsp.ServerCapabilities }): boolean {
+    const plugin = LSPPlugin.get(view);
+    const hasCapability = plugin.client.serverCapabilities ? !!plugin.client.serverCapabilities[type.capability] : null;
+    if (!plugin || !hasCapability) return false
+    plugin.client.sync()
+    plugin.client.withMapping(mapping => type.get(plugin, view.state.selection.main.head).then(async response => {
+        if (!response) return
+        let loc = Array.isArray(response) ? response[0] : response;
+        const path = new URL(loc.uri).pathname;
+        const target = addEditor(await OpenFile.openFile(path));
+        const pos = mapping.getMapping(loc.uri) ? mapping.mapPosition(loc.uri, loc.range.start) : plugin.fromPosition(loc.range.start, target.view.state.doc);
+        target.view.dispatch({selection: {anchor: pos}, scrollIntoView: true, userEvent: "select.definition"});
+    }, error => plugin.reportError("Find definition failed", error)))
+    return true
+}
+
+/// Jump to the definition of the symbol at the cursor. To support
+/// cross-file jumps, you'll need to implement
+/// [`Workspace.displayFile`](#lsp-client.Workspace.displayFile).
+export const jumpToDefinition: Command = view => jumpToOrigin(view, {
+    get: getDefinition,
+    capability: "definitionProvider"
+})
+
+/// Jump to the declaration of the symbol at the cursor.
+export const jumpToDeclaration: Command = view => jumpToOrigin(view, {
+    get: getDeclaration,
+    capability: "declarationProvider"
+})
+
+/// Jump to the type definition of the symbol at the cursor.
+export const jumpToTypeDefinition: Command = view => jumpToOrigin(view, {
+    get: getTypeDefinition,
+    capability: "typeDefinitionProvider"
+})
+
+/// Jump to the implementation of the symbol at the cursor.
+export const jumpToImplementation: Command = view => jumpToOrigin(view, {
+    get: getImplementation,
+    capability: "implementationProvider"
+})
+
+/// Binds F12 to [`jumpToDefinition`](#lsp-client.jumpToDefinition).
+export const jumpToDefinitionKeymap: readonly KeyBinding[] = [
+    { key: "F12", run: jumpToDefinition, preventDefault: true },
+]
diff --git a/src/app/lsp/diagnostics.ts b/src/app/lsp/diagnostics.ts
index fc2a706..64a4579 100644
--- a/src/app/lsp/diagnostics.ts
+++ b/src/app/lsp/diagnostics.ts
@@ -1,5 +1,4 @@
 import type * as lsp from "vscode-languageserver-protocol";
-import { ChangeSet } from "@codemirror/state";
 import { ViewPlugin, ViewUpdate } from "@codemirror/view";
 import { LSPPlugin, LSPClientExtension } from "@codemirror/lsp-client";
 import { OpenFile } from "../filestate";