fix(build): keep tsdown prune best-effort

scripts/tsdown-build.mjs

@@ -47,17 +47,22 @@ function pruneStaleRuntimeSymlinks() {
   removeDistPluginNodeModulesSymlinks(path.join(cwd, "dist-runtime"));
 }
 
-function pruneSourceCheckoutBundledPluginNodeModules() {
-  const cwd = process.cwd();
+export function pruneSourceCheckoutBundledPluginNodeModules(params = {}) {
+  const cwd = params.cwd ?? process.cwd();
+  const logger = params.logger ?? console;
   if (!isSourceCheckoutRoot({ packageRoot: cwd, existsSync: fs.existsSync })) {
     return;
   }
-  pruneBundledPluginSourceNodeModules({
-    extensionsDir: path.join(cwd, "extensions"),
-    existsSync: fs.existsSync,
-    readdirSync: fs.readdirSync,
-    rmSync: fs.rmSync,
-  });
+  try {
+    pruneBundledPluginSourceNodeModules({
+      extensionsDir: path.join(cwd, "extensions"),
+      existsSync: fs.existsSync,
+      readdirSync: fs.readdirSync,
+      rmSync: fs.rmSync,
+    });
+  } catch (error) {
+    logger.warn(`tsdown: could not prune bundled plugin source node_modules: ${String(error)}`);
+  }
 }
 
 function findFatalUnresolvedImport(lines) {

test/scripts/tsdown-build.test.ts

@@ -1,5 +1,9 @@
-import { describe, expect, it } from "vitest";
-import { resolveTsdownBuildInvocation } from "../../scripts/tsdown-build.mjs";
+import fs from "node:fs";
+import { describe, expect, it, vi } from "vitest";
+import {
+  pruneSourceCheckoutBundledPluginNodeModules,
+  resolveTsdownBuildInvocation,
+} from "../../scripts/tsdown-build.mjs";
 
 describe("resolveTsdownBuildInvocation", () => {
   it("routes Windows tsdown builds through the pnpm runner instead of shell=true", () => {
@@ -30,4 +34,26 @@ describe("resolveTsdownBuildInvocation", () => {
       },
     });
   });
+
+  it("keeps source-checkout prune best-effort", () => {
+    const warn = vi.spyOn(console, "warn").mockImplementation(() => {});
+    const rmSync = vi.spyOn(fs, "rmSync");
+
+    rmSync.mockImplementation(() => {
+      throw new Error("locked");
+    });
+
+    expect(() =>
+      pruneSourceCheckoutBundledPluginNodeModules({
+        cwd: process.cwd(),
+      }),
+    ).not.toThrow();
+
+    expect(warn).toHaveBeenCalledWith(
+      "tsdown: could not prune bundled plugin source node_modules: Error: locked",
+    );
+
+    warn.mockRestore();
+    rmSync.mockRestore();
+  });
 });