diff --git a/docs/docs/codes/keymap-upgrader.mdx b/docs/docs/codes/keymap-upgrader.mdx
new file mode 100644
index 00000000..bcee82b5
--- /dev/null
+++ b/docs/docs/codes/keymap-upgrader.mdx
@@ -0,0 +1,21 @@
+---
+title: Keymap Upgrader
+sidebar_label: Keymap Upgrader
+hide_title: true
+hide_table_of_contents: true
+---
+
+# Keymap Upgrader
+
+Many codes have been renamed to be more consistent with each other.
+Paste the contents of a `.keymap` file below to upgrade all deprecated codes to their replacements.
+
+Hover your mouse over the upgraded keymap and click the `Copy` button to copy it to your clipboard.
+
+You will likely need to realign columns in the upgraded keymap. The upgrader also does not handle
+codes inside a `#define`, so you will need to update those manually using
+[this list of deprecated codes and replacements](https://github.com/zmkfirmware/zmk/blob/main/docs/src/data/keymap-upgrade.js).
+
+import KeymapUpgrader from "@site/src/components/KeymapUpgrader/index";
+
+<KeymapUpgrader />
diff --git a/docs/docusaurus.config.js b/docs/docusaurus.config.js
index 2716039c..acf51f4a 100644
--- a/docs/docusaurus.config.js
+++ b/docs/docusaurus.config.js
@@ -1,3 +1,5 @@
+const path = require("path");
+
 module.exports = {
   title: "ZMK Firmware",
   tagline: "Modern, open source keyboard firmware",
@@ -6,6 +8,7 @@ module.exports = {
   favicon: "img/favicon.ico",
   organizationName: "zmkfirmware", // Usually your GitHub org/user name.
   projectName: "zmk", // Usually your repo name.
+  plugins: [path.resolve(__dirname, "src/docusaurus-tree-sitter-plugin")],
   themeConfig: {
     googleAnalytics: {
       trackingID: "UA-145201102-2",
diff --git a/docs/package-lock.json b/docs/package-lock.json
index 757beb04..0e48a97b 100644
--- a/docs/package-lock.json
+++ b/docs/package-lock.json
@@ -14,16 +14,20 @@
         "@fortawesome/react-fontawesome": "^0.1.12",
         "classnames": "^2.2.6",
         "react": "^16.8.4",
+        "react-async": "^10.0.1",
         "react-copy-to-clipboard": "^5.0.2",
         "react-dom": "^16.8.4",
-        "react-toastify": "^6.0.9"
+        "react-toastify": "^6.0.9",
+        "web-tree-sitter": "^0.17.1"
       },
       "devDependencies": {
         "eslint": "^7.12.0",
         "eslint-config-prettier": "^6.14.0",
         "eslint-plugin-mdx": "^1.8.2",
         "eslint-plugin-react": "^7.21.5",
-        "prettier": "2.1.2"
+        "null-loader": "^3.0.0",
+        "prettier": "2.1.2",
+        "string-replace-loader": "2.3"
       }
     },
     "node_modules/@algolia/cache-browser-local-storage": {
@@ -11321,6 +11325,14 @@
         "prop-types": "15.7.2"
       }
     },
+    "node_modules/react-async": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/react-async/-/react-async-10.0.1.tgz",
+      "integrity": "sha512-ORUz5ca0B57QgBIzEZM5SuhJ6xFjkvEEs0gylLNlWf06vuVcLZsjIw3wx58jJkZG38p+0nUAxRgFW2b7mnVZzA==",
+      "peerDependencies": {
+        "react": ">=16.3.1"
+      }
+    },
     "node_modules/react-base16-styling": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/react-base16-styling/-/react-base16-styling-0.6.0.tgz",
@@ -13334,6 +13346,45 @@
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
       "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
     },
+    "node_modules/string-replace-loader": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/string-replace-loader/-/string-replace-loader-2.3.0.tgz",
+      "integrity": "sha512-HYBIHStViMKLZC/Lehxy42OuwsBaPzX/LjcF5mkJlE2SnHXmW6SW6eiHABTXnY8ZCm/REbdJ8qnA0ptmIzN0Ng==",
+      "dev": true,
+      "dependencies": {
+        "loader-utils": "^1.2.3",
+        "schema-utils": "^2.6.5"
+      },
+      "peerDependencies": {
+        "webpack": "1 || 2 || 3 || 4"
+      }
+    },
+    "node_modules/string-replace-loader/node_modules/json5": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
+      "integrity": "sha512-aKS4WQjPenRxiQsC93MNfjx+nbF4PAdYzmd/1JIj8HYzqfbu86beTuNgXDzPknWk0n0uARlyewZo4s++ES36Ow==",
+      "dev": true,
+      "dependencies": {
+        "minimist": "^1.2.0"
+      },
+      "bin": {
+        "json5": "lib/cli.js"
+      }
+    },
+    "node_modules/string-replace-loader/node_modules/loader-utils": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-1.4.0.tgz",
+      "integrity": "sha512-qH0WSMBtn/oHuwjy/NucEgbx5dbxxnxup9s4PVXJUDHZBQY+s0NWA9rJf53RBnQZxfch7euUui7hpoAPvALZdA==",
+      "dev": true,
+      "dependencies": {
+        "big.js": "^5.2.2",
+        "emojis-list": "^3.0.0",
+        "json5": "^1.0.1"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
     "node_modules/string-width": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
@@ -14794,6 +14845,7 @@
       "version": "1.2.13",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.13.tgz",
       "integrity": "sha512-oWb1Z6mkHIskLzEJ/XWX0srkpkTQ7vaopMQkyaEIoq0fmtFVxOthb8cCxeT+p3ynTdkk/RZwbgG4brR5BeWECw==",
+      "hasInstallScript": true,
       "optional": true,
       "dependencies": {
         "bindings": "1.5.0",
@@ -14929,6 +14981,11 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/web-tree-sitter": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/web-tree-sitter/-/web-tree-sitter-0.17.1.tgz",
+      "integrity": "sha512-QgaeV+wmlB1Qaw9rS5a0ZDBt8GRcKkF+hGNSVxQ/HLm1lPCow3BKOhoILaXkYm7YozCcL7TjppRADBwFJugbuA=="
+    },
     "node_modules/webidl-conversions": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
@@ -15202,6 +15259,7 @@
       "version": "1.2.13",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.13.tgz",
       "integrity": "sha512-oWb1Z6mkHIskLzEJ/XWX0srkpkTQ7vaopMQkyaEIoq0fmtFVxOthb8cCxeT+p3ynTdkk/RZwbgG4brR5BeWECw==",
+      "hasInstallScript": true,
       "optional": true,
       "dependencies": {
         "bindings": "1.5.0",
@@ -26900,6 +26958,12 @@
         "prop-types": "15.7.2"
       }
     },
+    "react-async": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/react-async/-/react-async-10.0.1.tgz",
+      "integrity": "sha512-ORUz5ca0B57QgBIzEZM5SuhJ6xFjkvEEs0gylLNlWf06vuVcLZsjIw3wx58jJkZG38p+0nUAxRgFW2b7mnVZzA==",
+      "requires": {}
+    },
     "react-base16-styling": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/react-base16-styling/-/react-base16-styling-0.6.0.tgz",
@@ -28878,6 +28942,38 @@
         }
       }
     },
+    "string-replace-loader": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/string-replace-loader/-/string-replace-loader-2.3.0.tgz",
+      "integrity": "sha512-HYBIHStViMKLZC/Lehxy42OuwsBaPzX/LjcF5mkJlE2SnHXmW6SW6eiHABTXnY8ZCm/REbdJ8qnA0ptmIzN0Ng==",
+      "dev": true,
+      "requires": {
+        "loader-utils": "^1.2.3",
+        "schema-utils": "^2.6.5"
+      },
+      "dependencies": {
+        "json5": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
+          "integrity": "sha512-aKS4WQjPenRxiQsC93MNfjx+nbF4PAdYzmd/1JIj8HYzqfbu86beTuNgXDzPknWk0n0uARlyewZo4s++ES36Ow==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.0"
+          }
+        },
+        "loader-utils": {
+          "version": "1.4.0",
+          "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-1.4.0.tgz",
+          "integrity": "sha512-qH0WSMBtn/oHuwjy/NucEgbx5dbxxnxup9s4PVXJUDHZBQY+s0NWA9rJf53RBnQZxfch7euUui7hpoAPvALZdA==",
+          "dev": true,
+          "requires": {
+            "big.js": "^5.2.2",
+            "emojis-list": "^3.0.0",
+            "json5": "^1.0.1"
+          }
+        }
+      }
+    },
     "string-width": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
@@ -30421,6 +30517,11 @@
       "resolved": "https://registry.npmjs.org/web-namespaces/-/web-namespaces-1.1.4.tgz",
       "integrity": "sha512-wYxSGajtmoP4WxfejAPIr4l0fVh+jeMXZb08wNc0tMg6xsfZXj3cECqIK0G7ZAqUq0PP8WlMDtaOGVBTAWztNw=="
     },
+    "web-tree-sitter": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/web-tree-sitter/-/web-tree-sitter-0.17.1.tgz",
+      "integrity": "sha512-QgaeV+wmlB1Qaw9rS5a0ZDBt8GRcKkF+hGNSVxQ/HLm1lPCow3BKOhoILaXkYm7YozCcL7TjppRADBwFJugbuA=="
+    },
     "webidl-conversions": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
diff --git a/docs/package.json b/docs/package.json
index 00dc6275..5249bcff 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -21,9 +21,11 @@
     "@fortawesome/react-fontawesome": "^0.1.12",
     "classnames": "^2.2.6",
     "react": "^16.8.4",
+    "react-async": "^10.0.1",
     "react-copy-to-clipboard": "^5.0.2",
     "react-dom": "^16.8.4",
-    "react-toastify": "^6.0.9"
+    "react-toastify": "^6.0.9",
+    "web-tree-sitter": "^0.17.1"
   },
   "browserslist": {
     "production": [
@@ -42,6 +44,8 @@
     "eslint-config-prettier": "^6.14.0",
     "eslint-plugin-mdx": "^1.8.2",
     "eslint-plugin-react": "^7.21.5",
-    "prettier": "2.1.2"
+    "null-loader": "^3.0.0",
+    "prettier": "2.1.2",
+    "string-replace-loader": "2.3"
   }
 }
diff --git a/docs/sidebars.js b/docs/sidebars.js
index 7d124cc6..8fc1dc54 100644
--- a/docs/sidebars.js
+++ b/docs/sidebars.js
@@ -35,6 +35,7 @@ module.exports = {
       "codes/applications",
       "codes/input-assist",
       "codes/power",
+      "codes/keymap-upgrader",
     ],
     Development: [
       "development/clean-room",
diff --git a/docs/src/components/KeymapUpgrader/index.jsx b/docs/src/components/KeymapUpgrader/index.jsx
new file mode 100644
index 00000000..8d3a60b2
--- /dev/null
+++ b/docs/src/components/KeymapUpgrader/index.jsx
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: CC-BY-NC-SA-4.0
+ */
+
+import React from "react";
+import { useAsync } from "react-async";
+
+import { initParser, upgradeKeymap } from "@site/src/keymap-upgrade";
+import CodeBlock from "@theme/CodeBlock";
+
+import styles from "./styles.module.css";
+
+export default function KeymapUpgrader() {
+  const { error, isPending } = useAsync(initParser);
+
+  if (isPending) {
+    return <p>Loading...</p>;
+  }
+
+  if (error) {
+    return <p className="error">Error: {error.message}</p>;
+  }
+
+  return <Editor />;
+}
+
+function Editor() {
+  const [keymap, setKeymap] = React.useState("");
+  const upgraded = upgradeKeymap(keymap);
+
+  return (
+    <div>
+      <textarea
+        className={styles.editor}
+        placeholder="Paste keymap here"
+        spellCheck={false}
+        value={keymap}
+        onChange={(e) => setKeymap(e.target.value)}
+      ></textarea>
+      <div className={styles.result}>
+        <CodeBlock metastring={'title="Upgraded Keymap"'}>{upgraded}</CodeBlock>
+      </div>
+    </div>
+  );
+}
diff --git a/docs/src/components/KeymapUpgrader/styles.module.css b/docs/src/components/KeymapUpgrader/styles.module.css
new file mode 100644
index 00000000..31e06b97
--- /dev/null
+++ b/docs/src/components/KeymapUpgrader/styles.module.css
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: CC-BY-NC-SA-4.0
+ */
+
+.editor {
+  font-family: var(--ifm-font-family-monospace);
+  font-size: var(--ifm-font-size-base);
+  line-height: var(--ifm-pre-line-height);
+  tab-size: 4;
+
+  color: var(--ifm-pre-color);
+  background-color: var(--ifm-pre-background);
+
+  border: none;
+  border-radius: var(--ifm-pre-border-radius);
+
+  width: 100%;
+  min-height: 10em;
+  padding: var(--ifm-pre-padding);
+}
+
+.result {
+  tab-size: 4;
+}
diff --git a/docs/src/data/keymap-upgrade.js b/docs/src/data/keymap-upgrade.js
new file mode 100644
index 00000000..bc83c951
--- /dev/null
+++ b/docs/src/data/keymap-upgrade.js
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: CC-BY-NC-SA-4.0
+ */
+
+export const Codes = {
+  NUM_1: "N1",
+  NUM_2: "N2",
+  NUM_3: "N3",
+  NUM_4: "N4",
+  NUM_5: "N5",
+  NUM_6: "N6",
+  NUM_7: "N7",
+  NUM_8: "N8",
+  NUM_9: "N9",
+  NUM_0: "N0",
+  BKSP: "BSPC",
+  SPC: "SPACE",
+  EQL: "EQUAL",
+  TILD: "TILDE",
+  SCLN: "SEMI",
+  QUOT: "SQT",
+  GRAV: "GRAVE",
+  CMMA: "COMMA",
+  PRSC: "PSCRN",
+  SCLK: "SLCK",
+  PAUS: "PAUSE_BREAK",
+  PGUP: "PG_UP",
+  PGDN: "PG_DN",
+  RARW: "RIGHT",
+  LARW: "LEFT",
+  DARW: "DOWN",
+  UARW: "UP",
+  KDIV: "KP_DIVIDE",
+  KMLT: "KP_MULTIPLY",
+  KMIN: "KP_MINUS",
+  KPLS: "KP_PLUS",
+  UNDO: "K_UNDO",
+  CUT: "K_CUT",
+  COPY: "K_COPY",
+  PSTE: "K_PASTE",
+  VOLU: "K_VOL_UP",
+  VOLD: "K_VOL_DN",
+  CURU: "DLLR",
+  LPRN: "LPAR",
+  RPRN: "RPAR",
+  LCUR: "LBRC",
+  RCUR: "RBRC",
+  CRRT: "CARET",
+  PRCT: "PRCNT",
+  LABT: "LT",
+  RABT: "GT",
+  COLN: "COLON",
+  KSPC: null,
+  ATSN: "AT",
+  BANG: "EXCL",
+  LCTL: "LCTRL",
+  LSFT: "LSHFT",
+  RCTL: "RCTRL",
+  RSFT: "RSHFT",
+  M_NEXT: "C_NEXT",
+  M_PREV: "C_PREV",
+  M_STOP: "C_STOP",
+  M_EJCT: "C_EJECT",
+  M_PLAY: "C_PP",
+  M_MUTE: "C_MUTE",
+  M_VOLU: "C_VOL_UP",
+  M_VOLD: "C_VOL_DN",
+  GUI: "K_CMENU",
+  MOD_LCTL: "LCTRL",
+  MOD_LSFT: "LSHFT",
+  MOD_LALT: "LALT",
+  MOD_LGUI: "LGUI",
+  MOD_RCTL: "RCTRL",
+  MOD_RSFT: "RSHFT",
+  MOD_RALT: "RALT",
+  MOD_RGUI: "RGUI",
+};
+
+export const Behaviors = {
+  cp: "kp",
+  inc_dec_cp: "inc_dec_kp",
+};
diff --git a/docs/src/docusaurus-tree-sitter-plugin/index.js b/docs/src/docusaurus-tree-sitter-plugin/index.js
new file mode 100644
index 00000000..7803a9e9
--- /dev/null
+++ b/docs/src/docusaurus-tree-sitter-plugin/index.js
@@ -0,0 +1,39 @@
+module.exports = function () {
+  return {
+    configureWebpack(config, isServer) {
+      let rules = [];
+
+      // Tree-sitter is only used for client-side code.
+      // Don't try to load it on the server.
+      if (isServer) {
+        rules.push({
+          test: /web-tree-sitter/,
+          loader: "null-loader",
+        });
+      } else {
+        // web-tree-sitter has a hard-coded path to tree-sitter.wasm,
+        // (see https://github.com/tree-sitter/tree-sitter/issues/559)
+        // which some browsers treat as absolute and others as relative.
+        // This breaks everything. Rewrite it to always use an absolute path.
+        rules.push({
+          test: /tree-sitter\.js$/,
+          loader: "string-replace-loader",
+          options: {
+            search: '"tree-sitter.wasm"',
+            replace: '"/tree-sitter.wasm"',
+            strict: true,
+          },
+        });
+      }
+
+      return {
+        // web-tree-sitter tries to import "fs", which can be ignored.
+        // https://github.com/tree-sitter/tree-sitter/issues/466
+        node: {
+          fs: "empty",
+        },
+        module: { rules },
+      };
+    },
+  };
+};
diff --git a/docs/src/keymap-upgrade.js b/docs/src/keymap-upgrade.js
new file mode 100644
index 00000000..19a5d8e3
--- /dev/null
+++ b/docs/src/keymap-upgrade.js
@@ -0,0 +1,232 @@
+import Parser from "web-tree-sitter";
+
+import { Codes, Behaviors } from "./data/keymap-upgrade";
+
+let Devicetree;
+
+export async function initParser() {
+  await Parser.init();
+  Devicetree = await Parser.Language.load("/tree-sitter-devicetree.wasm");
+}
+
+function createParser() {
+  if (!Devicetree) {
+    throw new Error("Parser not loaded. Call initParser() first.");
+  }
+
+  const parser = new Parser();
+  parser.setLanguage(Devicetree);
+  return parser;
+}
+
+export function upgradeKeymap(text) {
+  const parser = createParser();
+  const tree = parser.parse(text);
+
+  const edits = [...upgradeBehaviors(tree), ...upgradeKeycodes(tree)];
+
+  return applyEdits(text, edits);
+}
+
+class TextEdit {
+  /**
+   * Creates a text edit to replace a range or node with new text.
+   * Construct with one of:
+   *
+   * * `Edit(startIndex, endIndex, newText)`
+   * * `Edit(node, newText)`
+   */
+  constructor(startIndex, endIndex, newText) {
+    if (typeof startIndex !== "number") {
+      const node = startIndex;
+      newText = endIndex;
+      startIndex = node.startIndex;
+      endIndex = node.endIndex;
+    }
+
+    /** @type number */
+    this.startIndex = startIndex;
+    /** @type number */
+    this.endIndex = endIndex;
+    /** @type string */
+    this.newText = newText;
+  }
+}
+
+/**
+ * Upgrades deprecated behavior references.
+ * @param {Parser.Tree} tree
+ */
+function upgradeBehaviors(tree) {
+  /** @type TextEdit[] */
+  let edits = [];
+
+  const query = Devicetree.query("(reference label: (identifier) @ref)");
+  const matches = query.matches(tree.rootNode);
+
+  for (const { captures } of matches) {
+    const node = findCapture("ref", captures);
+    if (node) {
+      edits.push(...getUpgradeEdits(node, Behaviors));
+    }
+  }
+
+  return edits;
+}
+
+/**
+ * Upgrades deprecated key code identifiers.
+ * @param {Parser.Tree} tree
+ */
+function upgradeKeycodes(tree) {
+  /** @type TextEdit[] */
+  let edits = [];
+
+  // No need to filter to the bindings array. The C preprocessor would have
+  // replaced identifiers anywhere, so upgrading all identifiers preserves the
+  // original behavior of the keymap (even if that behavior wasn't intended).
+  const query = Devicetree.query("(identifier) @name");
+  const matches = query.matches(tree.rootNode);
+
+  for (const { captures } of matches) {
+    const node = findCapture("name", captures);
+    if (node) {
+      edits.push(...getUpgradeEdits(node, Codes, keycodeReplaceHandler));
+    }
+  }
+
+  return edits;
+}
+
+/**
+ * @param {Parser.SyntaxNode} node
+ * @param {string | null} replacement
+ * @returns TextEdit[]
+ */
+function keycodeReplaceHandler(node, replacement) {
+  if (replacement) {
+    return [new TextEdit(node, replacement)];
+  }
+
+  const nodes = findBehaviorNodes(node);
+
+  if (nodes.length === 0) {
+    console.warn(
+      `Found deprecated code "${node.text}" but it is not a parameter to a behavior`
+    );
+    return [new TextEdit(node, `/* "${node.text}" no longer exists */`)];
+  }
+
+  const oldText = nodes.map((n) => n.text).join(" ");
+  const newText = `&none /* "${oldText}" no longer exists */`;
+
+  const startIndex = nodes[0].startIndex;
+  const endIndex = nodes[nodes.length - 1].endIndex;
+
+  return [new TextEdit(startIndex, endIndex, newText)];
+}
+
+/**
+ * Returns the node for the named capture.
+ * @param {string} name
+ * @param {any[]} captures
+ * @returns {Parser.SyntaxNode | null}
+ */
+function findCapture(name, captures) {
+  for (const c of captures) {
+    if (c.name === name) {
+      return c.node;
+    }
+  }
+
+  return null;
+}
+
+/**
+ * Given a parameter to a keymap behavior, returns a list of nodes beginning
+ * with the behavior and including all parameters.
+ * Returns an empty array if no behavior was found.
+ * @param {Parser.SyntaxNode} paramNode
+ */
+function findBehaviorNodes(paramNode) {
+  // Walk backwards from the given parameter to find the behavior reference.
+  let behavior = paramNode.previousNamedSibling;
+  while (behavior && behavior.type !== "reference") {
+    behavior = behavior.previousNamedSibling;
+  }
+
+  if (!behavior) {
+    return [];
+  }
+
+  // Walk forward from the behavior to collect all its parameters.
+
+  let nodes = [behavior];
+  let param = behavior.nextNamedSibling;
+  while (param && param.type !== "reference") {
+    nodes.push(param);
+    param = param.nextNamedSibling;
+  }
+
+  return nodes;
+}
+
+/**
+ * Gets a list of text edits to apply based on a node and a map of text
+ * replacements.
+ *
+ * If replaceHandler is given, it will be called if the node matches a
+ * deprecated value and it should return the text edits to apply.
+ *
+ * @param {Parser.SyntaxNode} node
+ * @param {Map<string, string | null>} replacementMap
+ * @param {(node: Parser.SyntaxNode, replacement: string | null) => TextEdit[]} replaceHandler
+ */
+function getUpgradeEdits(node, replacementMap, replaceHandler = undefined) {
+  for (const [deprecated, replacement] of Object.entries(replacementMap)) {
+    if (node.text === deprecated) {
+      if (replaceHandler) {
+        return replaceHandler(node, replacement);
+      } else {
+        return [new TextEdit(node, replacement)];
+      }
+    }
+  }
+  return [];
+}
+
+/**
+ * Sorts a list of text edits in ascending order by position.
+ * @param {TextEdit[]} edits
+ */
+function sortEdits(edits) {
+  return edits.sort((a, b) => a.startIndex - b.startIndex);
+}
+
+/**
+ * Returns a string with text replacements applied.
+ * @param {string} text
+ * @param {TextEdit[]} edits
+ */
+function applyEdits(text, edits) {
+  edits = sortEdits(edits);
+
+  /** @type string[] */
+  const chunks = [];
+  let currentIndex = 0;
+
+  for (const edit of edits) {
+    if (edit.startIndex < currentIndex) {
+      console.warn("discarding overlapping edit", edit);
+      continue;
+    }
+
+    chunks.push(text.substring(currentIndex, edit.startIndex));
+    chunks.push(edit.newText);
+    currentIndex = edit.endIndex;
+  }
+
+  chunks.push(text.substring(currentIndex));
+
+  return chunks.join("");
+}
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