`deno bundle` fails with multiple [ERR_MODULE_NOT_FOUND] and [ERR_UNSUPPORTED_DIR_IMPORT] errors

[maliknajjar]

I’m encountering an issue when trying to bundle my Deno project using deno bundle.

Command

deno bundle --output bundle.js src/main.ts

Output

deno bundle is experimental and subject to changes
error: [ERR_MODULE_NOT_FOUND] Cannot find module 'file:///index.js' imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/call-bind@1.0.7/node_modules/call-bind/callBound.js'
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/call-bind@1.0.7/node_modules/call-bind/callBound.js:3:23
error: Could not find package 'chokidar' from referrer 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/nunjucks@3.2.4/node_modules/nunjucks/src/node-loaders.js'.
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/nunjucks@3.2.4/node_modules/nunjucks/src/node-loaders.js:45:27
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/CJSImportProcessor.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/CJSImportProcessor.js:1:30
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/identifyShadowedGlobals.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/identifyShadowedGlobals.js:1:96
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/index.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/index.js:7:22
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/CJSImportTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/CJSImportTransformer.js:1:76
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/JSXTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/JSXTransformer.js:2:24
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactDisplayNameTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactDisplayNameTransformer.js:1:31
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactHotLoaderTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactHotLoaderTransformer.js:1:54
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getDeclarationInfo.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getDeclarationInfo.js:1:38
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getNonTypeIdentifiers.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getNonTypeIdentifiers.js:1:31
error: Could not find package 'source-map-support' from referrer 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/typescript@5.8.3/node_modules/typescript/lib/typescript.js'.
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/typescript@5.8.3/node_modules/typescript/lib/typescript.js:8190:20
error: bundling failed

Description

• I am using a Deno project that relies on Node.js modules (nunjucks, sucrase, etc.) resolved via npm: specifiers.

• Running deno bundle fails with multiple errors:

  • [ERR_MODULE_NOT_FOUND] when trying to resolve certain packages (e.g., chokidar, source-map-support).
  • [ERR_UNSUPPORTED_DIR_IMPORT] for directory imports inside the sucrase package.

• The bundling process does not complete successfully.

Expected Behavior

The project should bundle into a single JavaScript file (bundle.js) without these resolution errors.

[bartlomieju]

Please provide full reproduction code - it's hard to figure out what's going wrong when we don't have an exact content of src/main.ts.

[maliknajjar]

The application I’m building is fairly large, so I was debugging and tracking issues when I discovered that a specific piece of code is causing the bundler to crash. Interestingly, it works perfectly in Deno itself, but for some reason, the bundler fails when processing it.

Here’s the code in question:

import { createTypeAlias, printNode, zodToTs } from "npm:zod-to-ts@^1.2.0";

export function convertSchemaToTypeString(
  identifier: string,
  schema: any,
): string {
  const { node } = zodToTs(schema);
  const typeAlias = createTypeAlias(
    node,
    identifier,
  );
  const nodeString = printNode(typeAlias);
  return nodeString;
}

And this is the command I used to bundle it:

deno bundle --output bundle.js test.ts

this is the response of the command

⚠️ deno bundle is experimental and subject to changes
error: Could not find package 'source-map-support' from referrer 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/typescript@5.8.3/node_modules/typescript/lib/typescript.js'.
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/typescript@5.8.3/node_modules/typescript/lib/typescript.js:8190:20
error: bundling failed

[maliknajjar]

I also found another piece of code that crashes the bundler. Like before, it works perfectly in Deno itself, but bundling fails.

import { transform } from "npm:sucrase@^3.35.0";

function parseFunction(functionString: string) {
  const { code: vanillaJsFunctionString } = transform(functionString, {
    transforms: ["typescript"],
  });
  const functionObj = new Function("return " + vanillaJsFunctionString)();
  return functionObj;
}

This is its response

⚠️ deno bundle is experimental and subject to changes
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/CJSImportProcessor.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/CJSImportProcessor.js:1:30
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/identifyShadowedGlobals.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/identifyShadowedGlobals.js:1:96
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/index.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/index.js:7:22
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/CJSImportTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/CJSImportTransformer.js:1:76
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/JSXTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/JSXTransformer.js:2:24
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactDisplayNameTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactDisplayNameTransformer.js:1:31
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactHotLoaderTransformer.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/transformers/ReactHotLoaderTransformer.js:1:54
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getDeclarationInfo.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getDeclarationInfo.js:1:38
error: [ERR_UNSUPPORTED_DIR_IMPORT] Directory import 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/parser/tokenizer' is not supported resolving ES modules imported from 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getNonTypeIdentifiers.js'
Did you mean to import index.js within the directory?
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/sucrase@3.35.0/node_modules/sucrase/dist/esm/util/getNonTypeIdentifiers.js:1:31
error: bundling failed

[maliknajjar]

I’m sorry to bother you, but I’m confident this information will be very helpful in fixing the bundler’s issues.

this piece of code also causes the bundler to crash

// @ts-types="npm:@types/nunjucks@^3.2.4"
import nunjucks from "nunjucks";

function renderTemplate(text: string, context: any) {
  return nunjucks.renderString(text, context);
}

response

⚠️ deno bundle is experimental and subject to changes
error: Could not find package 'chokidar' from referrer 'file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/nunjucks@3.2.4/node_modules/nunjucks/src/node-loaders.js'.
    at file:///home/malik446644/Desktop/lobb_project/lobb/node_modules/.deno/nunjucks@3.2.4/node_modules/nunjucks/src/node-loaders.js:45:27
error: bundling failed

[nathanwhit]

Hello, thanks for reporting!

The directory import errors should be fixed in the latest deno version (2.4.5), I've confirmed that it used to error with sucrase on 2.4.3 but since 2.4.4 it should work. So if you upgrade, the sucrase snippet should now be fine.

The other errors should be addressed in #30522