mattzcarey · Oct 19, 2026 · Oct 19, 2026 · Oct 19, 2026 · Oct 19, 2026 · Oct 19, 2026
diff --git a/.changeset/smaller-tools-and-git.md b/.changeset/smaller-tools-and-git.md
@@ -0,0 +1,5 @@
+---
+"@cloudflare/computer": patch
+---
+
+The Git entrypoint hashes with `node:crypto` instead of bundling `sha.js` and its Buffer polyfills, which trims about 120 KB from a Worker that uses it, and the worker-shell modules are minified, shrinking them by 28%. `@cloudflare/computer/tools` and its `ai-sdk`, `pi-ai` and `tanstack-ai` variants also no longer reference the bundled isomorphic-git, which unbundled loaders such as Node and Vite's dev server used to fetch for them.
diff --git a/AGENTS.md b/AGENTS.md
@@ -65,7 +65,7 @@ packages first. Several suites need build output that is absent in
 a clean checkout: `packages/computerd` imports the sibling `@cloudflare/dofs`
 and `@cloudflare/computer-rpc` packages from their `dist/`
 directories, `packages/computerd`'s `src/cli/computerd.test.ts` spawns the bundled
-CLI at `dist/cli/computerd.cjs`, and `examples/think-compare-runtimes`
+CLI at `dist/cli/computerd.js`, and `examples/think-compare-runtimes`
 imports `@cloudflare/computer/backends/container-legacy`, which exists only
 after the `computer` package is built. Run `npm run build` across the
 npm workspace before `npm test` on a clean checkout.

diff --git a/docs/10_project_layout.md b/docs/10_project_layout.md
@@ -68,13 +68,13 @@ packages/computer/
 │   └── test-harness/                # Integration test wiring
 ├── tests/                           # Workerd integration suites
 ├── test-harness/                    # Container and load harness
-├── rolldown.config.ts               # ESM and declaration build
+├── tsdown.config.ts                 # ESM and declaration build
 ├── tsconfig.json
 ├── tsconfig.build.json
 └── package.json
 ```
 
-The package builds ESM and declarations with Rolldown. Public entrypoints include the root export, tools, Git, assets, artifacts, the Container, Worker shell, and Worker JavaScript backends, and Cloudflare observability. The injected service is the separate `computerd` package, and shared wire types live in `@cloudflare/computer-rpc`.
+The package builds ESM and declarations with tsdown. Public entrypoints include the root export, tools, Git, assets, artifacts, the Container, Worker shell, and Worker JavaScript backends, and Cloudflare observability. The injected service is the separate `computerd` package, and shared wire types live in `@cloudflare/computer-rpc`.
 
 ## `packages/dofs/` — `@cloudflare/dofs`
 
@@ -158,19 +158,19 @@ packages/computerd/
 │       ├── log.ts
 │       └── index.ts
 ├── scripts/
-│   ├── build.mjs                    # → dist/cli/computerd.cjs
 │   ├── build-bin.mjs                # SEA driver
 │   └── sea/
 │       └── bundle.mjs               # esbuild → SEA bundle
 ├── artifacts/
 │   └── computerd/
 │       ├── computerd-linux-x64
 │       └── computerd-macos-x64
+├── tsdown.config.ts                 # → dist/cli/computerd.js
 ├── tsconfig.json
 └── package.json
 ```
 
-Build pipeline: `scripts/build.mjs` emits `dist/cli/computerd.cjs`;
+Build pipeline: tsdown bundles `src/cli/computerd.ts` into `dist/cli/computerd.js`;
 `scripts/build-bin.mjs` together with `scripts/sea/bundle.mjs`
 produces the Node SEA single-file binary at
 `artifacts/computerd/computerd-{linux,macos}-x64`.
@@ -245,7 +245,7 @@ so each example can declare its own dependencies and scripts.
 - **oxfmt.** Formats JS, TypeScript and JSON, configured in
   `.oxfmtrc.json` at the repo root. Markdown, YAML, HTML and CSS are
   left alone. No ESLint, no Prettier.
-- **Rolldown.** Builds the Workspace package's ESM entrypoints and declarations.
+- **tsdown.** Builds every package: the Workspace package's ESM entrypoints and declarations, `@cloudflare/dofs` and `@cloudflare/computer-rpc`, and the `computerd` CLI. Sources use extensionless relative imports under `moduleResolution: "bundler"`.
 - **esbuild.** Used by `packages/computerd/scripts/sea/bundle.mjs` to produce the single-file `computerd` SEA bundle.
 - **vitest.** Drives unit tests in every package. `computerd` additionally
   uses `node --experimental-strip-types --test` for some scripts

diff --git a/examples/egress/src/egress.test.ts b/examples/egress/src/egress.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect, it, vi } from "vitest";
 
-import { mimeType, parseShellFetchResult, targetUrl, workspaceEgressPolicy } from "./egress.js";
+import { mimeType, parseShellFetchResult, targetUrl, workspaceEgressPolicy } from "./egress";
 
 describe("workspaceEgressPolicy", () => {
   it("blocks egress in none mode", () => {

diff --git a/examples/egress/src/index.ts b/examples/egress/src/index.ts
@@ -26,7 +26,7 @@ import {
   parseShellFetchResult,
   targetUrl,
   workspaceEgressPolicy,
-} from "./egress.js";
+} from "./egress";
 
 export { WorkspaceProxy, WorkspaceServiceProxy };
 

diff --git a/examples/mcp/src/index.ts b/examples/mcp/src/index.ts
@@ -11,7 +11,7 @@ import { WorkerShellBackend } from "@cloudflare/computer/backends/worker-shell";
 import { createGitClient } from "@cloudflare/computer/git";
 import { WebStandardStreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/webStandardStreamableHttp.js";
 
-import { createComputerMCPServer } from "./server.js";
+import { createComputerMCPServer } from "./server";
 
 interface Env {
   LOADER: WorkerLoader;

diff --git a/examples/mcp/tsconfig.json b/examples/mcp/tsconfig.json
@@ -1,9 +1,9 @@
 {
   "compilerOptions": {
-    "target": "ES2022",
+    "target": "ESNext",
     "module": "ESNext",
     "moduleResolution": "Bundler",
-    "lib": ["ES2022", "ESNext.Disposable"],
+    "lib": ["ESNext"],
     "types": [
       "./worker-configuration.d.ts",
       "@cloudflare/vitest-pool-workers/types",

diff --git a/examples/pi-ai/src/index.ts b/examples/pi-ai/src/index.ts
@@ -12,7 +12,7 @@ import { WorkerShellBackend } from "@cloudflare/computer/backends/worker-shell";
 import { createPiTools } from "@cloudflare/computer/tools/pi-ai";
 import { createModels, type Message } from "@earendil-works/pi-ai";
 
-import { WORKERS_AI_PROVIDER, workersAI } from "./workers-ai.js";
+import { WORKERS_AI_PROVIDER, workersAI } from "./workers-ai";
 
 // The worker-shell backend reaches back into this durable object by
 // binding name and id, so the shell shares the agent's filesystem.

diff --git a/examples/rlm/tsconfig.app.json b/examples/rlm/tsconfig.app.json
@@ -1,9 +1,9 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
-    "target": "ES2022",
+    "target": "ESNext",
     "useDefineForClassFields": true,
-    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "lib": ["ESNext", "DOM", "DOM.Iterable"],
     "allowImportingTsExtensions": true,
     "module": "ESNext",
     "types": ["vite/client"],

diff --git a/examples/rlm/tsconfig.node.json b/examples/rlm/tsconfig.node.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
-    "target": "ES2023",
-    "lib": ["ES2023"],
+    "target": "ESNext",
+    "lib": ["ESNext"],
     "module": "ESNext",
     "moduleResolution": "bundler",
     "types": ["node"],

diff --git a/examples/rlm/tsconfig.worker.json b/examples/rlm/tsconfig.worker.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.worker.tsbuildinfo",
-    "target": "ES2022",
-    "lib": ["ES2022"],
+    "target": "ESNext",
+    "lib": ["ESNext"],
     "module": "ESNext",
     "moduleResolution": "bundler",
     "types": ["./worker-configuration.d.ts"],

diff --git a/examples/think-compare-runtimes/tsconfig.app.json b/examples/think-compare-runtimes/tsconfig.app.json
@@ -1,9 +1,9 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
-    "target": "ES2022",
+    "target": "ESNext",
     "useDefineForClassFields": true,
-    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "lib": ["ESNext", "DOM", "DOM.Iterable"],
     "allowImportingTsExtensions": true,
     "module": "ESNext",
     "types": ["vite/client"],

diff --git a/examples/think-compare-runtimes/tsconfig.node.json b/examples/think-compare-runtimes/tsconfig.node.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
-    "target": "ES2023",
-    "lib": ["ES2023"],
+    "target": "ESNext",
+    "lib": ["ESNext"],
     "module": "ESNext",
     "types": ["node"],
     "skipLibCheck": true,

diff --git a/examples/think-compare-runtimes/tsconfig.worker.json b/examples/think-compare-runtimes/tsconfig.worker.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.worker.tsbuildinfo",
-    "target": "ES2022",
-    "lib": ["ES2022"],
+    "target": "ESNext",
+    "lib": ["ESNext"],
     "allowImportingTsExtensions": true,
     "module": "ESNext",
     "types": ["./worker-configuration.d.ts"],

diff --git a/examples/think/src/index.ts b/examples/think/src/index.ts
@@ -18,7 +18,7 @@
  */
 
 import { routeAgentRequest } from "agents";
-import { Assistant, WorkspaceProxy, WorkspaceServiceProxy } from "./agent.js";
+import { Assistant, WorkspaceProxy, WorkspaceServiceProxy } from "./agent";
 
 export { Assistant, WorkspaceProxy, WorkspaceServiceProxy };