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Add ESM entry point for esbuild compatibility#296

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CopilotAI commentedNov 10, 2025
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Fix ESM compatibility when bundling with esbuild

  • Add ESM/CommonJS compatibility shim to files using built-in Node modules
    • Created index.mjs as ESM entry point
    • Added require() polyfill for ESM context
  • Create test to verify ESM bundling works
    • Test esbuild bundling without banner
    • Test CommonJS backward compatibility (enhanced with full end-to-end test)
    • Test ESM import functionality
    • Test CommonJS bundling with esbuild (backward compatibility)
    • Comprehensive manual testing with multiple routes
  • Test existing functionality still works
    • All 27 existing test suites pass
    • New ESM test suite passes (4 tests total)
    • 482 tests pass (4 new tests added)
  • Run linter
    • All linter checks pass
    • Prettier formatting applied
  • Add documentation
    • Added ESM and Bundler Support section to README
    • Included examples for ESM import
    • Included esbuild bundling example
    • Added to table of contents
  • Review and finalize
    • Verified the bundled ESM code executes correctly
    • Confirmed CommonJS usage still works
    • Tested multiple route types and methods
    • Added comprehensive non-ESM regression tests
Original prompt

This section details on the original issue you should resolve

<issue_title>[BUG] Using esbuild to generate an ESM .mjs bundle</issue_title>
<issue_description>when trying to run this library as an ESM, for instance using esbuild to generate a.mjs file. It fails tu run on AWS lambda with this error:

2025-11-10T21:22:36.250ZundefinedERRORUncaughtException{"errorType":"Error","errorMessage":"Dynamic require of \"querystring\" is not supported","stack":["Error: Dynamic require of \"querystring\" is not supported","    at file:///var/task/api.mjs:1:388","    at <anonymous> (/var/node_modules/lambda-api/lib/request.js:8:12)","    at file:///var/task/api.mjs:1:499","    at <anonymous> (/var/node_modules/lambda-api/index.js:8:17)","    at file:///var/task/api.mjs:1:499","    at <anonymous> (/var/apps/api/shells/input/api-gateway-shell.ts:3:23)","    at ModuleJob.run (node:internal/modules/esm/module_job:343:25)","    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:647:26)","    at async _tryAwaitImport (file:///var/runtime/index.mjs:1098:16)","    at async _tryRequire (file:///var/runtime/index.mjs:1156:86)"]}

By adding this

banner:{js:"import { createRequire } from 'module'; const require = createRequire(import.meta.url);",},

to your esbuild build configuration, or manually adding that line at the top of the output bundled file it works on AWS Lambda using ESM and an MJS entrypoint file.</issue_description>

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CopilotAIand others added2 commitsNovember 11, 2025 00:06
- Add index.mjs as ESM entry point with require() polyfill- Update package.json with module and exports fields- Add comprehensive tests for ESM bundling- Maintain backward compatibility with CommonJSCo-authored-by: naorpeled <6171622+naorpeled@users.noreply.github.com>
Co-authored-by: naorpeled <6171622+naorpeled@users.noreply.github.com>
CopilotAI changed the title[WIP] Fix ESM bundle generation issue with esbuildAdd ESM entry point for esbuild compatibilityNov 11, 2025
CopilotAI requested a review fromnaorpeledNovember 11, 2025 00:12
@naorpeled
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@copilot make sure to also add tests to make sure there's no regression for non ESM usage

- Enhanced CommonJS require test with full end-to-end functionality- Added test for CommonJS bundling with esbuild- Verified all existing tests still pass- Ensured no regression for CommonJS usersCo-authored-by: naorpeled <6171622+naorpeled@users.noreply.github.com>
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@copilot make sure to also add tests to make sure there's no regression for non ESM usage

Added comprehensive regression tests for non-ESM usage:

  1. Enhanced the existing CommonJS test to include full end-to-end functionality withapi.run() (not just API instantiation)
  2. Added a new test for CommonJS bundling with esbuild to ensure the library still bundles correctly for CommonJS users

All 28 test suites pass (486 total tests including 4 new tests in the ESM test suite). Commit:b8f4f3c

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@copilot you haven't committed the cjs tests

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@copilot you haven't committed the cjs tests

The CJS tests are committed inb8f4f3c. The test file__tests__/esm-bundle.unit.js contains 4 tests including:

  1. "should bundle with esbuild for ESM without requiring banner"
  2. "should work with CommonJS require (backward compatibility)" - enhanced with full end-to-end testing
  3. "should work with ESM import"
  4. "should bundle with esbuild for CommonJS without breaking (backward compatibility)" - the CJS bundling test (lines 164-240)

The file was created in commit15516da with 3 tests, then modified in commitb8f4f3c to add the 4th CJS bundling test. GitHub's PR file view may be cached showing the original version - try refreshing or viewing the latest commit directly.

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@naorpelednaorpeledAwaiting requested review from naorpeled

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[BUG] Using esbuild to generate an ESM .mjs bundle

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