diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7c952ba6d08f1..d6082d38fb487 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -317,6 +317,16 @@ jobs:
           GOOS: ${{ matrix.config.goos }}
           GOARCH: ${{ matrix.config.goarch }}
 
+  knip:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
+        with:
+          node-version: 'lts/*'
+      - run: npm ci
+      - run: npm run knip
+
   format:
     runs-on: ubuntu-slim
     steps:
@@ -401,6 +411,7 @@ jobs:
       - format
       - generate
       - go-test
+      - knip
       - go-test-wasm
       - lint
       - misc
diff --git a/Herebyfile.mjs b/Herebyfile.mjs
index cd7a8c45fc9d4..fbcd480d70e1b 100644
--- a/Herebyfile.mjs
+++ b/Herebyfile.mjs
@@ -1399,6 +1399,25 @@ export const lint = task({
     run: runLint,
 });
 
+export const knip = task({
+    name: "knip",
+    description: "Runs knip.",
+    run: runKnip,
+});
+
+async function runKnip() {
+    const fixArgs = options.fix ? ["--fix"] : [];
+    await run(process.execPath, ["node_modules/knip/bin/knip.js", ...fixArgs]);
+    await run(process.execPath, [
+        "node_modules/knip/bin/knip.js",
+        "--include-entry-exports",
+        "--tags=+internal",
+        "--tags=-knipignore",
+        "--include=exports,types",
+        ...fixArgs,
+    ]);
+}
+
 async function runLint() {
     const lintArgs = ["run"];
     if (defaultGoBuildTags.length) {
@@ -1506,6 +1525,7 @@ export const validate = task({
             });
             await runValidation("test:smoke", runSmokeTest); // in CI this is run with `--race`
         }
+        await runValidation("knip", runKnip);
         await runValidation("lint", runLint);
         await runValidation("format", runFormat);
 
diff --git a/knip.jsonc b/knip.jsonc
new file mode 100644
index 0000000000000..231463bd28104
--- /dev/null
+++ b/knip.jsonc
@@ -0,0 +1,63 @@
+{
+    "$schema": "https://unpkg.com/knip@6/schema.json",
+    "exclude": ["duplicates", "enumMembers"],
+    "tags": ["-knipignore"],
+    "includeEntryExports": false,
+    "ignoreExportsUsedInFile": {
+        "enum": true,
+        "interface": true,
+        "type": true
+    },
+    "workspaces": {
+        ".": {
+            "entry": [
+                "Herebyfile.mjs",
+                "tools/scripts/lsp/fetchModel.mts",
+                "tools/scripts/tsc/generate.ts",
+                "tools/scripts/wasm/go-wasip1-exec.mts",
+                "tools/scripts/**/*.test.{mts,ts}",
+                "tsc/internal/stringutil/_scripts/*.mts"
+            ],
+            "project": [
+                "tools/scripts/**/*.{mjs,mts,ts}",
+                "tsc/internal/stringutil/_scripts/*.mts"
+            ],
+            "ignore": ["tools/scripts/lsp/metaModelSchema.mts"],
+            "ignoreDependencies": [
+                "@dprint/json",
+                "@dprint/typescript",
+                "@jakebailey/dprint-plugin-gofumpt",
+                // Loaded through a computed import in generate-unicode-data.mts.
+                "@unicode/unicode-15.1.0",
+                "dprint",
+                "dprint-plugin-yaml"
+            ]
+        },
+        "packages/typescript": {
+            "entry": [
+                "test/**/*.test.ts",
+                "test/**/*.bench.ts"
+            ],
+            "paths": {
+                "#enums/*": ["src/enums/*.ts"]
+            },
+            "project": [
+                "scripts/**/*.ts",
+                "src/**/*.ts",
+                "test/**/*.ts"
+            ],
+            "ignoreDependencies": [
+                "vscode-jsonrpc",
+                // Browser smoke tests use the extension workspace's build tool.
+                "esbuild"
+            ]
+        },
+        "packages/vscode-typescript": {
+            "project": [
+                "src/**/*.ts",
+                "test/**/*.ts"
+            ],
+            "ignoreDependencies": ["@vscode/vsce", "vscode-languageserver-protocol"]
+        }
+    }
+}
diff --git a/package-lock.json b/package-lock.json
index e3662ee7728c0..2cb2d6936113a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -23,6 +23,7 @@
                 "dprint": "^0.57.4",
                 "dprint-plugin-yaml": "^0.6.0",
                 "hereby": "^1.15.2",
+                "knip": "^6.38.0",
                 "tar": "^7.5.22",
                 "tinyexec": "^1.3.1",
                 "typescript": "^6.0.3"
@@ -461,6 +462,40 @@
                 "win32"
             ]
         },
+        "node_modules/@emnapi/core": {
+            "version": "1.11.2",
+            "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.11.2.tgz",
+            "integrity": "sha512-TC8MkTuZUtcTSiFeuC0ksCh9QIJ5+F21MvZ4Wn4ORfYaFJ/0dsiudv5tVkejgwZlwQ39jL9WWDe2lz8x0WglOA==",
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "dependencies": {
+                "@emnapi/wasi-threads": "1.2.2",
+                "tslib": "^2.4.0"
+            }
+        },
+        "node_modules/@emnapi/runtime": {
+            "version": "1.11.2",
+            "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.11.2.tgz",
+            "integrity": "sha512-kyOl3X0DuTiT1h2ft8r2fYO8JYtU9a9Xis/zBSiGArNaagCOWx90N1k2wxp18czFDH+OgcWGb5ZP/XMt3dcyPA==",
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "dependencies": {
+                "tslib": "^2.4.0"
+            }
+        },
+        "node_modules/@emnapi/wasi-threads": {
+            "version": "1.2.2",
+            "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.2.2.tgz",
+            "integrity": "sha512-c95qOXkHdydNKhscBTebqEC1CVAZpyqOfVfBzQ1qgzyl3gfeldUjIggDbIZgDKsHLgnsM+igH7TJ/eAasaVuMA==",
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "dependencies": {
+                "tslib": "^2.4.0"
+            }
+        },
         "node_modules/@esbuild/aix-ppc64": {
             "version": "0.28.2",
             "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.28.2.tgz",
@@ -1195,29 +1230,743 @@
                 "node": ">= 10"
             }
         },
-        "node_modules/@napi-rs/keyring-linux-arm-gnueabihf": {
-            "version": "1.3.0",
-            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-linux-arm-gnueabihf/-/keyring-linux-arm-gnueabihf-1.3.0.tgz",
-            "integrity": "sha512-KiWdMMu/Inz/bHHIAGrnF7r54FZDYXuHO6UFF/rhIrshUsxbMG1Rl9lEymNtqqsVo927G0VYcb02FzWQ3iBQRQ==",
+        "node_modules/@napi-rs/keyring-linux-arm-gnueabihf": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-linux-arm-gnueabihf/-/keyring-linux-arm-gnueabihf-1.3.0.tgz",
+            "integrity": "sha512-KiWdMMu/Inz/bHHIAGrnF7r54FZDYXuHO6UFF/rhIrshUsxbMG1Rl9lEymNtqqsVo927G0VYcb02FzWQ3iBQRQ==",
+            "cpu": [
+                "arm"
+            ],
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "linux"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-linux-arm64-gnu": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-linux-arm64-gnu/-/keyring-linux-arm64-gnu-1.3.0.tgz",
+            "integrity": "sha512-eyKGpY40lm9Jvs1aD294XRH4y7+TlJM0YVAryZeXA6TX0mb4gMkxVXwSQv7MCwgah7raeUd0dKUb4BPAYIgcMg==",
+            "cpu": [
+                "arm64"
+            ],
+            "dev": true,
+            "libc": [
+                "glibc"
+            ],
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "linux"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-linux-arm64-musl": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-linux-arm64-musl/-/keyring-linux-arm64-musl-1.3.0.tgz",
+            "integrity": "sha512-iIK6JWHXAJqDrEyLY3TmswwloVyt2vj+04TZnew+uSJ9gnDO8EwRbp3/iw3LpWaXiDO7VomGO6y8I0Id8uBZSw==",
+            "cpu": [
+                "arm64"
+            ],
+            "dev": true,
+            "libc": [
+                "musl"
+            ],
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "linux"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-linux-riscv64-gnu": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-linux-riscv64-gnu/-/keyring-linux-riscv64-gnu-1.3.0.tgz",
+            "integrity": "sha512-/PGqrwn6EwgtK6vccASSXJRfOSP4vN1F4ASsIQ+7MdrK6hNvAJ1FZPrIuD5gGGdxezo3F++To2Wq7DbuGIeuNQ==",
+            "cpu": [
+                "riscv64"
+            ],
+            "dev": true,
+            "libc": [
+                "glibc"
+            ],
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "linux"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-linux-x64-gnu": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-linux-x64-gnu/-/keyring-linux-x64-gnu-1.3.0.tgz",
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+            "cpu": [
+                "x64"
+            ],
+            "dev": true,
+            "libc": [
+                "glibc"
+            ],
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "linux"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-linux-x64-musl": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-linux-x64-musl/-/keyring-linux-x64-musl-1.3.0.tgz",
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+            "cpu": [
+                "x64"
+            ],
+            "dev": true,
+            "libc": [
+                "musl"
+            ],
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "linux"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-win32-arm64-msvc": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-win32-arm64-msvc/-/keyring-win32-arm64-msvc-1.3.0.tgz",
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+            "cpu": [
+                "arm64"
+            ],
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "win32"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-win32-ia32-msvc": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-win32-ia32-msvc/-/keyring-win32-ia32-msvc-1.3.0.tgz",
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+                "ia32"
+            ],
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "win32"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/keyring-win32-x64-msvc": {
+            "version": "1.3.0",
+            "resolved": "https://registry.npmjs.org/@napi-rs/keyring-win32-x64-msvc/-/keyring-win32-x64-msvc-1.3.0.tgz",
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+                "x64"
+            ],
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+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "win32"
+            ],
+            "engines": {
+                "node": ">= 10"
+            }
+        },
+        "node_modules/@napi-rs/wasm-runtime": {
+            "version": "1.2.4",
+            "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.2.4.tgz",
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+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "dependencies": {
+                "@tybys/wasm-util": "^0.10.3"
+            },
+            "engines": {
+                "node": "^20.19.0 || ^22.13.0 || >=23.5.0"
+            },
+            "funding": {
+                "type": "github",
+                "url": "https://github.com/sponsors/Brooooooklyn"
+            },
+            "peerDependencies": {
+                "@emnapi/core": "^1.7.1 || ^2.0.0-alpha.4",
+                "@emnapi/runtime": "^1.7.1 || ^2.0.0-alpha.4"
+            }
+        },
+        "node_modules/@nevware21/ts-async": {
+            "version": "0.6.1",
+            "resolved": "https://registry.npmjs.org/@nevware21/ts-async/-/ts-async-0.6.1.tgz",
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+            "funding": [
+                {
+                    "type": "github",
+                    "url": "https://github.com/sponsors/nevware21"
+                },
+                {
+                    "type": "buymeacoffee",
+                    "url": "https://www.buymeacoffee.com/nevware21"
+                }
+            ],
+            "license": "MIT",
+            "dependencies": {
+                "@nevware21/ts-utils": ">= 0.15.0 < 2.x"
+            }
+        },
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+            "funding": [
+                {
+                    "type": "github",
+                    "url": "https://github.com/sponsors/nevware21"
+                },
+                {
+                    "type": "other",
+                    "url": "https://buymeacoffee.com/nevware21"
+                }
+            ],
+            "license": "MIT"
+        },
+        "node_modules/@oxc-parser/binding-android-arm-eabi": {
+            "version": "0.150.0",
+            "resolved": "https://registry.npmjs.org/@oxc-parser/binding-android-arm-eabi/-/binding-android-arm-eabi-0.150.0.tgz",
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+                "arm"
+            ],
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+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "android"
+            ],
+            "engines": {
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+            }
+        },
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+                "arm64"
+            ],
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+            "license": "MIT",
+            "optional": true,
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+                "android"
+            ],
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+            }
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+                "arm64"
+            ],
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+            "license": "MIT",
+            "optional": true,
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+            ],
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+            "license": "MIT",
+            "optional": true,
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+            ],
+            "engines": {
+                "node": "^20.19.0 || >=22.12.0"
+            }
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+            "resolved": "https://registry.npmjs.org/@oxc-parser/binding-linux-arm-musleabihf/-/binding-linux-arm-musleabihf-0.150.0.tgz",
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+            "license": "MIT",
+            "optional": true,
+            "os": [
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+            "engines": {
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+            }
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+            "version": "2.9.1",
+            "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.1.tgz",
+            "integrity": "sha512-3NxN8+78OdzbT7C/WjGsyfPAtJaN3FNDsWxv7Y7mcDsT/oOmgW8BpyQQFFBnvZE3j9Y2Sdz1ULFLezL7Eb2yFw==",
+            "dev": true,
+            "license": "ISC",
+            "bin": {
+                "yaml": "bin.mjs"
+            },
+            "engines": {
+                "node": ">= 14.6"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/eemeli"
+            }
+        },
         "node_modules/yargs": {
             "version": "17.7.3",
             "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.3.tgz",
@@ -3782,6 +4738,16 @@
                 "buffer-crc32": "~0.2.3"
             }
         },
+        "node_modules/zod": {
+            "version": "4.6.5",
+            "resolved": "https://registry.npmjs.org/zod/-/zod-4.6.5.tgz",
+            "integrity": "sha512-v5l/aFXZQeai4awLbOpSoHecE9UiMrnfx75tEXLjNonXVARxQ5mOeipTjROUchszUNCqnE+hqAMujRsRHsut2Q==",
+            "dev": true,
+            "license": "MIT",
+            "funding": {
+                "url": "https://github.com/sponsors/colinhacks"
+            }
+        },
         "packages/typescript": {
             "name": "@typescript/typescript",
             "version": "0.0.0",
diff --git a/package.json b/package.json
index f6b4cf0bf6ab4..a81e72a606013 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
         "build:watch:debug": "hereby build:watch --debug",
         "test": "hereby test",
         "lint": "hereby lint",
+        "knip": "hereby knip",
         "format": "hereby format",
         "check:format": "hereby check:format",
         "generate": "hereby generate",
@@ -35,6 +36,7 @@
         "dprint": "^0.57.4",
         "dprint-plugin-yaml": "^0.6.0",
         "hereby": "^1.15.2",
+        "knip": "^6.38.0",
         "tar": "^7.5.22",
         "tinyexec": "^1.3.1",
         "typescript": "^6.0.3"
diff --git a/packages/typescript/src/api/async/client.ts b/packages/typescript/src/api/async/client.ts
index a394f01698146..b44f840a4a4b8 100644
--- a/packages/typescript/src/api/async/client.ts
+++ b/packages/typescript/src/api/async/client.ts
@@ -44,8 +44,7 @@ import {
     type TransportClient,
 } from "./transportClient.ts";
 
-export type { AsyncClientOptions as ClientOptions, AsyncClientTransportOptions, ClientSocketOptions, ClientSpawnOptions } from "../options.ts";
-export type { AsyncTransport } from "./transport.ts";
+export type { ClientSocketOptions, ClientSpawnOptions } from "../options.ts";
 
 export type Client = TransportClient | RpcClient;
 
diff --git a/packages/typescript/src/api/node/node.ts b/packages/typescript/src/api/node/node.ts
index 77f2c9366fcd8..8037fd5a8a3ed 100644
--- a/packages/typescript/src/api/node/node.ts
+++ b/packages/typescript/src/api/node/node.ts
@@ -47,7 +47,7 @@ import { Wtf8Decoder } from "./wtf8.ts";
 
 // Re-export everything consumers need from the other two files.
 export { RemoteNode, RemoteNodeList } from "./node.generated.ts";
-export { readParseOptionsKey, readSourceFileHash, readSourceFileLease, readSourceFileNodeId, RemoteNodeBase } from "./node.infrastructure.ts";
+export { readParseOptionsKey, readSourceFileHash, readSourceFileLease } from "./node.infrastructure.ts";
 
 const sourceFileExtendedDataOffsets = {
     Text: 0,
@@ -467,28 +467,6 @@ function computeLineOfPosition(lineStarts: readonly number[], position: number):
     return low - 1;
 }
 
-/**
- * Find a descendant node at a specific position with matching kind and end position.
- */
-export function findDescendant(root: Node, pos: number, end: number, kind: SyntaxKind): Node | undefined {
-    if (root.pos === pos && root.end === end && root.kind === kind) {
-        return root;
-    }
-
-    // Search children
-    let result: Node | undefined;
-    root.forEachChild(child => {
-        if (result) return result; // Already found
-        // Only search in children that could contain our target
-        if (child.pos <= pos && child.end >= end) {
-            result = findDescendant(child, pos, end, kind);
-        }
-        return undefined;
-    });
-
-    return result;
-}
-
 /**
  * Parsed components of a node handle.
  */
diff --git a/packages/typescript/src/api/node/protocol.generated.ts b/packages/typescript/src/api/node/protocol.generated.ts
index 8c224bc9a9196..3f8cba2df0527 100644
--- a/packages/typescript/src/api/node/protocol.generated.ts
+++ b/packages/typescript/src/api/node/protocol.generated.ts
@@ -177,68 +177,3 @@ export const childProperties: Readonly<Partial<Record<SyntaxKind, readonly (stri
     [SyntaxKind.JSDocParameterTag]: ["tagName", "name", "typeExpression", "comment"],
     [SyntaxKind.JSDocPropertyTag]: ["tagName", "name", "typeExpression", "comment"],
 };
-
-export const singleChildNodePropertyNames: Readonly<Partial<Record<SyntaxKind, string>>> = {
-    [SyntaxKind.ComputedPropertyName]: "expression",
-    [SyntaxKind.Decorator]: "expression",
-    [SyntaxKind.BreakStatement]: "label",
-    [SyntaxKind.ContinueStatement]: "label",
-    [SyntaxKind.ReturnStatement]: "expression",
-    [SyntaxKind.CaseBlock]: "clauses",
-    [SyntaxKind.DefaultClause]: "statements",
-    [SyntaxKind.ThrowStatement]: "expression",
-    [SyntaxKind.ExpressionStatement]: "expression",
-    [SyntaxKind.Block]: "statements",
-    [SyntaxKind.VariableDeclarationList]: "declarations",
-    [SyntaxKind.ObjectBindingPattern]: "elements",
-    [SyntaxKind.ArrayBindingPattern]: "elements",
-    [SyntaxKind.MissingDeclaration]: "modifiers",
-    [SyntaxKind.HeritageClause]: "types",
-    [SyntaxKind.ModuleBlock]: "statements",
-    [SyntaxKind.ExternalModuleReference]: "expression",
-    [SyntaxKind.NamespaceImport]: "name",
-    [SyntaxKind.NamedImports]: "elements",
-    [SyntaxKind.NamespaceExport]: "name",
-    [SyntaxKind.NamedExports]: "elements",
-    [SyntaxKind.PrefixUnaryExpression]: "operand",
-    [SyntaxKind.PostfixUnaryExpression]: "operand",
-    [SyntaxKind.MetaProperty]: "name",
-    [SyntaxKind.NonNullExpression]: "expression",
-    [SyntaxKind.SpreadElement]: "expression",
-    [SyntaxKind.ParenthesizedExpression]: "expression",
-    [SyntaxKind.ArrayLiteralExpression]: "elements",
-    [SyntaxKind.ObjectLiteralExpression]: "properties",
-    [SyntaxKind.SpreadAssignment]: "expression",
-    [SyntaxKind.DeleteExpression]: "expression",
-    [SyntaxKind.TypeOfExpression]: "expression",
-    [SyntaxKind.VoidExpression]: "expression",
-    [SyntaxKind.AwaitExpression]: "expression",
-    [SyntaxKind.UnionType]: "types",
-    [SyntaxKind.IntersectionType]: "types",
-    [SyntaxKind.TypeOperator]: "type",
-    [SyntaxKind.InferType]: "typeParameter",
-    [SyntaxKind.ArrayType]: "elementType",
-    [SyntaxKind.LiteralType]: "literal",
-    [SyntaxKind.ImportAttributes]: "attributes",
-    [SyntaxKind.TypeLiteral]: "members",
-    [SyntaxKind.TupleType]: "elements",
-    [SyntaxKind.OptionalType]: "type",
-    [SyntaxKind.RestType]: "type",
-    [SyntaxKind.ParenthesizedType]: "type",
-    [SyntaxKind.SyntheticExpression]: "tupleNameSource",
-    [SyntaxKind.PartiallyEmittedExpression]: "expression",
-    [SyntaxKind.JsxAttributes]: "properties",
-    [SyntaxKind.JsxSpreadAttribute]: "expression",
-    [SyntaxKind.JsxClosingElement]: "tagName",
-    [SyntaxKind.SyntaxList]: "children",
-    [SyntaxKind.JSDocTypeExpression]: "type",
-    [SyntaxKind.JSDocNonNullableType]: "type",
-    [SyntaxKind.JSDocNullableType]: "type",
-    [SyntaxKind.JSDocVariadicType]: "type",
-    [SyntaxKind.JSDocOptionalType]: "type",
-    [SyntaxKind.JSDocNameReference]: "name",
-    [SyntaxKind.JSDocLink]: "name",
-    [SyntaxKind.JSDocLinkPlain]: "name",
-    [SyntaxKind.JSDocLinkCode]: "name",
-    [SyntaxKind.JSDocTypeLiteral]: "jsdocPropertyTags",
-};
diff --git a/packages/typescript/src/api/node/protocol.ts b/packages/typescript/src/api/node/protocol.ts
index bf01e29560665..a0531ab3f9f74 100644
--- a/packages/typescript/src/api/node/protocol.ts
+++ b/packages/typescript/src/api/node/protocol.ts
@@ -13,7 +13,6 @@ export const HEADER_OFFSET_STRUCTURED_DATA = 36;
 export const HEADER_OFFSET_NODES = 40;
 export const HEADER_OFFSET_SOURCE_FILE_ID = 44;
 export const HEADER_OFFSET_SOURCE_FILE_LEASE = 52;
-export const HEADER_OFFSET_BINDER_DATA = 60;
 export const HEADER_SIZE = 64;
 
 export const NODE_LEN = 28;
@@ -32,8 +31,5 @@ export const NODE_DATA_TYPE_CHILDREN = 0x00000000;
 export const NODE_DATA_TYPE_STRING = 0x40000000;
 export const NODE_DATA_TYPE_EXTENDED = 0x80000000;
 
-export const NODE_STRING_INDEX_MASK = 0x00FFFFFF;
-export const NODE_EXTENDED_DATA_MASK = 0x00FFFFFF;
-
 // Re-export generated child properties
-export { childProperties, singleChildNodePropertyNames } from "./protocol.generated.ts";
+export { childProperties } from "./protocol.generated.ts";
diff --git a/packages/typescript/src/api/path.ts b/packages/typescript/src/api/path.ts
index e692cdf1b3833..8c9bf819ed4eb 100644
--- a/packages/typescript/src/api/path.ts
+++ b/packages/typescript/src/api/path.ts
@@ -180,14 +180,14 @@ function lastOrUndefined<T>(array: T[]): T | undefined {
 /**
  * Determines whether a path has a trailing separator (`/` or `\\`).
  */
-export function hasTrailingDirectorySeparator(path: string): boolean {
+function hasTrailingDirectorySeparator(path: string): boolean {
     return path.length > 0 && isAnyDirectorySeparator(path.charCodeAt(path.length - 1));
 }
 
 /**
  * Removes a trailing directory separator from a path, if it does not already have one.
  */
-export function removeTrailingDirectorySeparator(path: string): string {
+function removeTrailingDirectorySeparator(path: string): string {
     if (hasTrailingDirectorySeparator(path)) {
         return path.substr(0, path.length - 1);
     }
@@ -197,7 +197,7 @@ export function removeTrailingDirectorySeparator(path: string): string {
 /**
  * Adds a trailing directory separator to a path, if it does not already have one.
  */
-export function ensureTrailingDirectorySeparator(path: string): string {
+function ensureTrailingDirectorySeparator(path: string): string {
     if (!hasTrailingDirectorySeparator(path)) {
         return path + directorySeparator;
     }
@@ -207,7 +207,7 @@ export function ensureTrailingDirectorySeparator(path: string): string {
 /**
  * Normalize path separators, converting `\\` into `/`.
  */
-export function normalizeSlashes(path: string): string {
+function normalizeSlashes(path: string): string {
     return path.includes("\\")
         ? path.replace(backslashRegExp, directorySeparator)
         : path;
@@ -216,7 +216,7 @@ export function normalizeSlashes(path: string): string {
 /**
  * Combines paths. If a path is absolute, it replaces any previous path. Relative paths are not simplified.
  */
-export function combinePaths(path: string, ...paths: (string | undefined)[]): string {
+function combinePaths(path: string, ...paths: (string | undefined)[]): string {
     if (path) path = normalizeSlashes(path);
     for (let relativePath of paths) {
         if (!relativePath) continue;
@@ -253,7 +253,7 @@ function simpleNormalizePath(path: string): string | undefined {
 /**
  * Returns the normalized absolute path, resolving `.` and `..` segments.
  */
-export function getNormalizedAbsolutePath(path: string, currentDirectory: string | undefined): string {
+function getNormalizedAbsolutePath(path: string, currentDirectory: string | undefined): string {
     let rootLength = getRootLength(path);
     if (rootLength === 0 && currentDirectory) {
         path = combinePaths(currentDirectory, path);
@@ -364,7 +364,7 @@ export function normalizePath(path: string): string {
  * Determines whether a path is an absolute disk path (e.g. starts with `/`, or a DOS path
  * like `c:`, `c:\\` or `c:/`).
  */
-export function isRootedDiskPath(path: string): boolean {
+function isRootedDiskPath(path: string): boolean {
     return getEncodedRootLength(path) > 0;
 }
 
@@ -601,7 +601,7 @@ const dynamicURIPathSegmentEscapeRegExp = /(?:^|\/)(?:\.{1,2}(?:\/|$)|~ts-uri-es
 /**
  * Returns true if the path refers to a bundled library file.
  */
-export function isBundled(path: string): boolean {
+function isBundled(path: string): boolean {
     return path.startsWith(bundledScheme);
 }
 
@@ -609,7 +609,7 @@ export function isBundled(path: string): boolean {
  * Returns true if the file name represents a dynamic/virtual file
  * that doesn't exist on disk (e.g., untitled files with paths like "^/untitled/...").
  */
-export function isDynamicFileName(fileName: string): boolean {
+function isDynamicFileName(fileName: string): boolean {
     return fileName.startsWith("^/");
 }
 
@@ -617,7 +617,7 @@ export function isDynamicFileName(fileName: string): boolean {
  * Splits a Windows volume (e.g., "c:") from the rest of the path.
  * Returns [volume, rest, ok] where ok is true if a volume was found.
  */
-export function splitVolumePath(path: string): [volume: string, rest: string, ok: boolean] {
+function splitVolumePath(path: string): [volume: string, rest: string, ok: boolean] {
     if (path.length >= 2 && isVolumeCharacter(path.charCodeAt(0)) && path.charCodeAt(1) === CharacterCodesColon) {
         return [path.substring(0, 2).toLowerCase(), path.substring(2), true];
     }
diff --git a/packages/typescript/src/api/sync/client.ts b/packages/typescript/src/api/sync/client.ts
index d440bc46d4558..6b96ce60b4d0b 100644
--- a/packages/typescript/src/api/sync/client.ts
+++ b/packages/typescript/src/api/sync/client.ts
@@ -17,8 +17,6 @@ import { TimingDump } from "../timingDump.ts";
 import { TransportClient } from "./transportClient.ts";
 
 export type { ClientSocketOptions, ClientSpawnOptions };
-export type { ClientTransportOptions, SyncClientOptions as ClientOptions } from "../options.ts";
-export type { SyncTransport } from "./transport.ts";
 
 export class Client extends TransportClient {
     private readonly channel: SyncRpcChannel | undefined;
diff --git a/packages/typescript/src/api/syncChannel.ts b/packages/typescript/src/api/syncChannel.ts
index 0adfd45ab2c0c..6a002f7f22317 100644
--- a/packages/typescript/src/api/syncChannel.ts
+++ b/packages/typescript/src/api/syncChannel.ts
@@ -87,7 +87,7 @@ function trackChild(process: NodeJS.Process, child: ChildProcess): void {
     liveChildren.add(child);
 }
 
-export function createPipePath(): string {
+function createPipePath(): string {
     const process = nodeProcess();
     return `\\\\.\\pipe\\tsgo-sync-${process.pid}-${process.getBuiltinModule("node:crypto").randomBytes(16).toString("hex")}`;
 }
diff --git a/packages/typescript/src/api/timing.ts b/packages/typescript/src/api/timing.ts
index b4d719d4c2869..05672d852bb3f 100644
--- a/packages/typescript/src/api/timing.ts
+++ b/packages/typescript/src/api/timing.ts
@@ -14,7 +14,7 @@
  */
 
 /** Number of most-recent requests retained in the ring buffer. */
-export const RECENT_REQUEST_CAPACITY = 5;
+const RECENT_REQUEST_CAPACITY = 5;
 
 /** A single request's measured timing and transfer sample. */
 export interface RequestTiming {
diff --git a/packages/typescript/src/ast/is.ts b/packages/typescript/src/ast/is.ts
index f69661af7a03f..5516ccc2f3ff6 100644
--- a/packages/typescript/src/ast/is.ts
+++ b/packages/typescript/src/ast/is.ts
@@ -476,7 +476,7 @@ function isUnaryExpressionKind(kind: SyntaxKind): boolean {
 }
 
 /** @internal */
-export function isOuterExpression(node: Node, kinds: OuterExpressionKinds = OuterExpressionKinds.All): node is OuterExpression {
+function isOuterExpression(node: Node, kinds: OuterExpressionKinds = OuterExpressionKinds.All): node is OuterExpression {
     switch (node.kind) {
         case SyntaxKind.ParenthesizedExpression:
             if (kinds & OuterExpressionKinds.ExcludeJSDocTypeAssertion && isJSDocTypeAssertion(node as ParenthesizedExpression)) {
diff --git a/packages/typescript/src/internal/utils.ts b/packages/typescript/src/internal/utils.ts
index f04a0462035d2..ecfb47c8e4fb3 100644
--- a/packages/typescript/src/internal/utils.ts
+++ b/packages/typescript/src/internal/utils.ts
@@ -24,7 +24,7 @@ export interface MapLike<T> {
  * @param map A map-like.
  * @param key A property key.
  */
-export function hasProperty(map: MapLike<any>, key: string): boolean {
+function hasProperty(map: MapLike<any>, key: string): boolean {
     return hasOwnProperty.call(map, key);
 }
 
@@ -33,7 +33,7 @@ export function assertNever(member: never, message = "Illegal value:", stackCraw
     return fail(`${message} ${detail}`, stackCrawlMark || assertNever);
 }
 
-export function fail(message?: string, stackCrawlMark?: AnyFunction): never {
+function fail(message?: string, stackCrawlMark?: AnyFunction): never {
     // eslint-disable-next-line no-debugger
     debugger;
     const e = new Error(message ? `Debug Failure. ${message}` : "Debug Failure.");
diff --git a/packages/vscode-typescript/src/configurationMiddleware.ts b/packages/vscode-typescript/src/configurationMiddleware.ts
index 75928b54be531..9cb77ad716382 100644
--- a/packages/vscode-typescript/src/configurationMiddleware.ts
+++ b/packages/vscode-typescript/src/configurationMiddleware.ts
@@ -1,7 +1,9 @@
 import * as vscode from "vscode";
 
-import type { ConfigurationMiddleware } from "vscode-languageclient";
-import type { MessageSignature } from "vscode-languageserver-protocol";
+import type {
+    ConfigurationMiddleware,
+    MessageSignature,
+} from "vscode-languageclient";
 
 /**
  * Configuration middleware for the TypeScript language server.
diff --git a/packages/vscode-typescript/src/contentMapperContributions.ts b/packages/vscode-typescript/src/contentMapperContributions.ts
index 8be5dc01a8acd..596f2a8037a73 100644
--- a/packages/vscode-typescript/src/contentMapperContributions.ts
+++ b/packages/vscode-typescript/src/contentMapperContributions.ts
@@ -1,5 +1,5 @@
 import type { ContentMapperContribution } from "@typescript/typescript/vscode";
-export type { ContentMapperContribution, ContentMapperManifest } from "@typescript/typescript/vscode";
+export type { ContentMapperContribution } from "@typescript/typescript/vscode";
 
 export interface SerializedContentMapperContribution {
     readonly contributorId: string;
diff --git a/packages/vscode-typescript/src/managedFileContext.ts b/packages/vscode-typescript/src/managedFileContext.ts
deleted file mode 100644
index d1da83b63332f..0000000000000
--- a/packages/vscode-typescript/src/managedFileContext.ts
+++ /dev/null
@@ -1,56 +0,0 @@
-import * as vscode from "vscode";
-import { ActiveJsTsEditorTracker } from "./activeJsTsEditorTracker";
-import {
-    disabledSchemes,
-    isJsConfigOrTsConfigFileName,
-    isSupportedLanguageMode,
-} from "./util";
-
-/**
- * When-clause context set when the current file is managed by tsgo.
- */
-export class ManagedFileContextManager implements vscode.Disposable {
-    private static readonly contextName = "typescript.isManagedFile";
-
-    private isInManagedFileContext = false;
-    private disposables: vscode.Disposable[] = [];
-
-    constructor(activeJsTsEditorTracker: ActiveJsTsEditorTracker) {
-        this.disposables.push(
-            activeJsTsEditorTracker.onDidChangeActiveJsTsEditor(
-                editor => this.onDidChangeActiveTextEditor(editor),
-            ),
-        );
-        this.onDidChangeActiveTextEditor(activeJsTsEditorTracker.activeJsTsEditor);
-    }
-
-    private onDidChangeActiveTextEditor(editor?: vscode.TextEditor): void {
-        if (editor) {
-            this.updateContext(this.isManagedFile(editor));
-        }
-        else {
-            this.updateContext(false);
-        }
-    }
-
-    private isManagedFile(editor: vscode.TextEditor): boolean {
-        if (disabledSchemes.has(editor.document.uri.scheme)) {
-            return false;
-        }
-        return isSupportedLanguageMode(editor.document)
-            || isJsConfigOrTsConfigFileName(editor.document.fileName);
-    }
-
-    private updateContext(newValue: boolean): void {
-        if (newValue === this.isInManagedFileContext) {
-            return;
-        }
-        vscode.commands.executeCommand("setContext", ManagedFileContextManager.contextName, newValue);
-        this.isInManagedFileContext = newValue;
-    }
-
-    dispose(): void {
-        this.updateContext(false);
-        this.disposables.forEach(d => d.dispose());
-    }
-}
diff --git a/packages/vscode-typescript/src/telemetryReporting.ts b/packages/vscode-typescript/src/telemetryReporting.ts
index 03f01b19b0e55..30a31e61bf125 100644
--- a/packages/vscode-typescript/src/telemetryReporting.ts
+++ b/packages/vscode-typescript/src/telemetryReporting.ts
@@ -90,14 +90,6 @@ export type LSErrorResponse = {
     stack: string;
 };
 
-export type EnableNativePreview = {};
-
-export type DisableNativePreview = {};
-
-export type RestartLanguageServer = {};
-
-export type ReportIssue = {};
-
 export type UnexpectedTelemetryPurpose = {
     telemetryPurpose: string;
 };
diff --git a/packages/vscode-typescript/src/util.ts b/packages/vscode-typescript/src/util.ts
index f81fe724d6c95..f2eeef7dd006a 100644
--- a/packages/vscode-typescript/src/util.ts
+++ b/packages/vscode-typescript/src/util.ts
@@ -7,7 +7,7 @@ import { resolvePackageExecutable } from "./tsdkPackage";
 export const aiConnectionString = "0c6ae279ed8443289764825290e4f9e2-1a736e7c-1324-4338-be46-fc2a58ae4d14-7255";
 
 export const languageClientName = "TypeScript Language Server";
-export const enableContributedNightlyVersion = true;
+const enableContributedNightlyVersion = true;
 
 export const jsTsLanguageModes = [
     "typescript",
@@ -16,7 +16,7 @@ export const jsTsLanguageModes = [
     "javascriptreact",
 ];
 
-export const builtinTSExtensionId = "vscode.typescript-language-features";
+const builtinTSExtensionId = "vscode.typescript-language-features";
 
 /**
  * URI schemes for which JS/TS language features should be disabled.
@@ -47,7 +47,7 @@ export interface ExeInfo {
 
 const packagedExeBaseNames = ["tsc", "tsgo"];
 
-export async function getBuiltinExePath(context: vscode.ExtensionContext): Promise<ExeInfo> {
+async function getBuiltinExePath(context: vscode.ExtensionContext): Promise<ExeInfo> {
     if (context.extensionMode === vscode.ExtensionMode.Development) {
         const exeName = `tsc${process.platform === "win32" ? ".exe" : ""}`;
         const exe = context.asAbsolutePath(path.join("../../", "built", "local", exeName));
@@ -65,7 +65,7 @@ export async function getBuiltinExePath(context: vscode.ExtensionContext): Promi
     return getPackagedExePath(context.extension.extensionUri);
 }
 
-export async function getNightlyExePath(): Promise<ExeInfo | undefined> {
+async function getNightlyExePath(): Promise<ExeInfo | undefined> {
     const extension = vscode.extensions.getExtension(nightlyExtensionId);
     if (!extension) {
         return undefined;
@@ -149,32 +149,6 @@ export async function getExe(context: vscode.ExtensionContext): Promise<ExeInfo>
     return getDefaultExePath(context);
 }
 
-export async function hasTsdkConfigured(): Promise<boolean> {
-    return (await getTsdkCandidates({ nativeOnly: false })).length > 0;
-}
-
-export async function hasNativeTsdkConfigured(context: vscode.ExtensionContext): Promise<boolean> {
-    return await getTsdkServerKind(context) === "lsp";
-}
-
-export async function getTsdkServerKind(context: vscode.ExtensionContext): Promise<"lsp" | "tsserver" | undefined> {
-    for (const candidate of getTrustedTsdkCandidates(context, await getTsdkCandidates({ nativeOnly: false }))) {
-        const kind = await classifyTsdk(candidate.value);
-        if (kind) {
-            return kind;
-        }
-    }
-}
-
-async function classifyTsdk(tsdkPath: string): Promise<"lsp" | "tsserver" | undefined> {
-    if (await pathHasTsserverJs(tsdkPath)) {
-        return "tsserver";
-    }
-    if (await resolveTsdkPathToExe(tsdkPath)) {
-        return "lsp";
-    }
-}
-
 function getTrustedTsdkCandidates(context: vscode.ExtensionContext, tsdkCandidates: ExplicitConfigValue<string>[]): ExplicitConfigValue<string>[] {
     // If tsdk is set at the workspace level, require both workspace trust and
     // explicit user opt-in. Workspace trust can be revoked after the memento is
@@ -414,8 +388,3 @@ export function readUnifiedConfig<T>(
 export function contentMappersEnabled(): boolean {
     return vscode.workspace.getConfiguration("js/ts").get<boolean>("contentMappers.enabled", true);
 }
-
-export interface PackageInfo {
-    name: string;
-    version: string;
-}
diff --git a/packages/vscode-typescript/src/workspaceSymbolMiddleware.ts b/packages/vscode-typescript/src/workspaceSymbolMiddleware.ts
index a0dabf2062f80..69d9aa5069455 100644
--- a/packages/vscode-typescript/src/workspaceSymbolMiddleware.ts
+++ b/packages/vscode-typescript/src/workspaceSymbolMiddleware.ts
@@ -1,6 +1,6 @@
 import * as vscode from "vscode";
 import type { CancellationToken } from "vscode";
-import type { MessageSignature } from "vscode-languageserver-protocol";
+import type { MessageSignature } from "vscode-languageclient/node";
 import { isSupportedLanguageMode } from "./util";
 
 const supportedSchemes = new Set(["file", "untitled"]);
diff --git a/tools/scripts/gen/utils.mts b/tools/scripts/gen/utils.mts
index 0ce2bfcfd34f0..6d4b121472d72 100644
--- a/tools/scripts/gen/utils.mts
+++ b/tools/scripts/gen/utils.mts
@@ -80,7 +80,7 @@ export interface RunOptions {
     signal?: AbortSignal;
 }
 
-export function formatCommandArg(arg: string) {
+function formatCommandArg(arg: string) {
     return arg && /^[\w@%+=:,./-]+$/.test(arg) ? arg : JSON.stringify(arg);
 }
 
@@ -99,7 +99,7 @@ export async function run(command: string, args: readonly string[] = [], options
     );
 }
 
-export function globInputs(patterns: string[], exclude: string[] = []): string[] {
+function globInputs(patterns: string[], exclude: string[] = []): string[] {
     return fs.globSync(patterns, { cwd: repoRoot, exclude }).map(file => path.join(repoRoot, file));
 }
 
diff --git a/tools/scripts/post-vsts-artifact-comment.mjs b/tools/scripts/post-vsts-artifact-comment.mjs
deleted file mode 100644
index 1f8bec395c008..0000000000000
--- a/tools/scripts/post-vsts-artifact-comment.mjs
+++ /dev/null
@@ -1,111 +0,0 @@
-import { Octokit } from "@octokit/rest";
-import assert from "assert";
-import ado from "azure-devops-node-api";
-
-/**
- * @param {string} name
- */
-function mustGetEnv(name) {
-    const value = process.env[name];
-    assert(value, `No ${name} specified`);
-    return value;
-}
-
-const REQUESTING_USER = mustGetEnv("REQUESTING_USER");
-const SOURCE_ISSUE = +mustGetEnv("SOURCE_ISSUE");
-const BUILD_BUILDID = +mustGetEnv("BUILD_BUILDID");
-const DISTINCT_ID = mustGetEnv("DISTINCT_ID");
-const STATUS_COMMENT = +mustGetEnv("STATUS_COMMENT");
-
-const gh = new Octokit({
-    auth: process.argv[2],
-});
-
-async function main() {
-    // The pipelines API does _not_ make getting the direct URL to a specific file _within_ an artifact trivial
-    const cli = new ado.WebApi("https://typescript.visualstudio.com/defaultcollection", ado.getHandlerFromToken("")); // Empty token, anon auth
-    const build = await cli.getBuildApi();
-    const artifact = await build.getArtifact("typescript", BUILD_BUILDID, "tgz");
-    assert(artifact.resource?.url);
-    const updatedUrl = new URL(artifact.resource.url);
-    updatedUrl.search = `artifactName=tgz&fileId=${artifact.resource.data}&fileName=manifest`;
-    const resp = await (await fetch(`${updatedUrl}`)).json();
-    const file = /** @type {any} */ (resp).items[0];
-    const tgzUrl = new URL(artifact.resource.url);
-    tgzUrl.search = `artifactName=tgz&fileId=${file.blob.id}&fileName=${file.path}`;
-    const link = "" + tgzUrl;
-
-    // Please keep the strings "an installable tgz" and "packed" in this message, as well as the devDependencies section,
-    // so that the playgrounds deployment process can find these comments.
-
-    const comment = `Hey @${REQUESTING_USER}, I've packed this into [an installable tgz](${link}). You can install it for testing by referencing it in your \`package.json\` like so:
-\`\`\`
-{
-    "devDependencies": {
-        "typescript": "${link}"
-    }
-}
-\`\`\`
-and then running \`npm install\`.
-`;
-
-    // Temporarily disable until we get access controls set up right
-    // Send a ping to https://github.com/microsoft/typescript-make-monaco-builds#pull-request-builds
-    await gh.request("POST /repos/microsoft/typescript-make-monaco-builds/dispatches", { event_type: `${SOURCE_ISSUE}`, headers: { Accept: "application/vnd.github.everest-preview+json" } });
-
-    return comment;
-}
-
-let newComment;
-let emoji;
-
-try {
-    newComment = await main();
-    emoji = "✅";
-}
-catch (e) {
-    console.error(e);
-    newComment = `Hey @${REQUESTING_USER}, something went wrong when looking for the build artifact. ([You can check the log here](https://typescript.visualstudio.com/TypeScript/_build/index?buildId=${BUILD_BUILDID}&_a=summary)).`;
-    emoji = "❌";
-}
-
-const resultsComment = await gh.issues.createComment({
-    issue_number: SOURCE_ISSUE,
-    owner: "microsoft",
-    repo: "TypeScript",
-    body: newComment,
-});
-
-const toReplace = `<!--result-${DISTINCT_ID}-->`;
-let posted = false;
-for (let i = 0; i < 5; i++) {
-    // Get status comment contents
-    const statusComment = await gh.rest.issues.getComment({
-        comment_id: STATUS_COMMENT,
-        owner: "microsoft",
-        repo: "TypeScript",
-    });
-
-    const oldComment = statusComment.data.body;
-    if (!oldComment?.includes(toReplace)) {
-        posted = true;
-        break;
-    }
-
-    const newComment = oldComment.replace(toReplace, `[${emoji} Results](${resultsComment.data.html_url})`);
-
-    // Update status comment
-    await gh.rest.issues.updateComment({
-        comment_id: STATUS_COMMENT,
-        owner: "microsoft",
-        repo: "TypeScript",
-        body: newComment,
-    });
-
-    // Repeat; someone may have edited the comment at the same time.
-    await new Promise(resolve => setTimeout(resolve, 1000));
-}
-
-if (!posted) {
-    throw new Error("Failed to update status comment");
-}
diff --git a/tools/scripts/tsc/generate-encoder.ts b/tools/scripts/tsc/generate-encoder.ts
index fa8d7236adf21..33684f2f006e4 100644
--- a/tools/scripts/tsc/generate-encoder.ts
+++ b/tools/scripts/tsc/generate-encoder.ts
@@ -1050,27 +1050,6 @@ function generateTSProtocol(): string {
     w.write("};");
     w.write("");
 
-    // singleChildNodePropertyNames mapping
-    w.write("export const singleChildNodePropertyNames: Readonly<Partial<Record<SyntaxKind, string>>> = {");
-    w.push();
-
-    for (const node of api.nodes()) {
-        const info = analyzeNode(node);
-        if (info.dataType === "extended") continue;
-        if (info.childProps.length !== 1) continue;
-
-        const kinds = getTSKinds(node);
-        const prop = api.uncapitalize(info.childProps[0].name);
-
-        for (const kind of kinds) {
-            w.write(`[SyntaxKind.${kind}]: "${prop}",`);
-        }
-    }
-
-    w.pop();
-    w.write("};");
-    w.write("");
-
     return w.toString();
 }
 
diff --git a/tools/scripts/tsc/schema.ts b/tools/scripts/tsc/schema.ts
index eb48ac6a1d919..61f9d7c96cab4 100644
--- a/tools/scripts/tsc/schema.ts
+++ b/tools/scripts/tsc/schema.ts
@@ -783,7 +783,7 @@ export interface Schema {
  * Wraps the parsed ast.json schema and provides common query/resolution
  * methods used by both the Go and TS code generators.
  */
-export class SchemaAPI {
+class SchemaAPI {
     readonly schema: Schema;
     private readonly listAliasNameMap = new Map<string, string>();
     private readonly instantiationAliasMap = new Map<string, string>();