diff --git a/src/node.ts b/src/node.ts
index 2573f84fd..b155d98c2 100644
--- a/src/node.ts
+++ b/src/node.ts
@@ -44,7 +44,7 @@ async function resolveNodeImportInternal(cacheRoot: string, packageRoot: string,
         }
       })();
       bundlePromises.set(outputPath, promise);
-      promise.catch(() => {}).then(() => bundlePromises.delete(outputPath));
+      promise.catch(console.error).then(() => bundlePromises.delete(outputPath));
     }
     await promise;
   }
diff --git a/src/npm.ts b/src/npm.ts
index 5bf49881f..ba309411a 100644
--- a/src/npm.ts
+++ b/src/npm.ts
@@ -237,7 +237,7 @@ async function resolveNpmVersion(root: string, specifier: NpmSpecifier): Promise
     mkdir(join(root, ".observablehq", "cache", "_npm", spec), {recursive: true}); // disk cache
     return version;
   })();
-  promise.catch(() => {}).then(() => npmVersionRequests.delete(href));
+  promise.catch(console.error).then(() => npmVersionRequests.delete(href));
   npmVersionRequests.set(href, promise);
   return promise;
 }
diff --git a/src/resolvers.ts b/src/resolvers.ts
index db4b77340..cab5bef5b 100644
--- a/src/resolvers.ts
+++ b/src/resolvers.ts
@@ -327,6 +327,8 @@ export function getModuleResolver(root: string, path: string): (specifier: strin
       ? relativePath(servePath, `/_observablehq/${specifier.slice("observablehq:".length)}${extname(specifier) ? "" : ".js"}`) // prettier-ignore
       : specifier.startsWith("npm:")
       ? relativePath(servePath, await resolveNpmImport(root, specifier.slice("npm:".length)))
+      : !/^\w+:/.test(specifier)
+      ? relativePath(servePath, await resolveNodeImport(root, specifier))
       : specifier;
   };
 }
diff --git a/test/javascript/transpile-test.ts b/test/javascript/transpile-test.ts
index c898d11c8..70d6118c1 100644
--- a/test/javascript/transpile-test.ts
+++ b/test/javascript/transpile-test.ts
@@ -6,6 +6,7 @@ import {isEnoent} from "../../src/error.js";
 import {parseJavaScript} from "../../src/javascript/parse.js";
 import type {TranspileModuleOptions} from "../../src/javascript/transpile.js";
 import {transpileJavaScript, transpileModule} from "../../src/javascript/transpile.js";
+import {mockJsDelivr} from "../mocks/jsdelivr.js";
 
 function isJsFile(inputRoot: string, fileName: string) {
   if (!fileName.endsWith(".js")) return false;
@@ -106,6 +107,7 @@ describe("transpileModule(input, root, path, sourcePath)", () => {
 });
 
 describe("transpileModule(input, root, path)", () => {
+  mockJsDelivr();
   const options: TranspileModuleOptions = {root: "docs", path: "test.js"};
   it("rewrites relative files with import.meta.resolve", async () => {
     assert.strictEqual(await testFile("./test.txt", "test.js"), 'FileAttachment("../test.txt", import.meta.url)'); // prettier-ignore
@@ -139,7 +141,7 @@ describe("transpileModule(input, root, path)", () => {
     assert.strictEqual(output, '(1, FileAttachment)("./test.txt")');
   });
   it("ignores FileAttachment if not imported from @observablehq/stdlib", async () => {
-    const input = 'import {FileAttachment} from "@observablehq/not-stdlib";\nFileAttachment("./test.txt")';
+    const input = 'import {FileAttachment} from "npm:@observablehq/inputs";\nFileAttachment("./test.txt")';
     const output = (await transpileModule(input, options)).split("\n").pop()!;
     assert.strictEqual(output, 'FileAttachment("./test.txt")');
   });
@@ -191,4 +193,14 @@ describe("transpileModule(input, root, path)", () => {
     await assert.rejects(() => transpileModule(input3, {...options, path: "sub/test.js"}), /non-local file path/); // prettier-ignore
     await assert.rejects(() => transpileModule(input4, {...options, path: "sub/test.js"}), /non-local file path/); // prettier-ignore
   });
+  it("rewrites npm imports", async () => {
+    const input = 'import "npm:d3-array";';
+    const output = (await transpileModule(input, options)).split("\n").pop()!;
+    assert.strictEqual(output, 'import "../_npm/d3-array@3.2.4/_esm.js";');
+  });
+  it("rewrites node imports", async () => {
+    const input = 'import "d3-array";';
+    const output = (await transpileModule(input, options)).split("\n").pop()!;
+    assert.strictEqual(output, 'import "../_node/d3-array@3.2.4/index.js";');
+  });
 });