Enhance package configuration with module exports and TypeScript settings #81

narekhovhannisyan · 2025-07-24T08:24:58Z

Motivation

fixes #78

Summary by CodeRabbit

Chores
- Improved package configuration for better module resolution.
- Enhanced TypeScript compiler settings for improved import handling and file consistency.
- Updated internal type definitions for mail transport to improve type safety and compatibility.

…t settings

coderabbitai · 2025-07-24T08:25:07Z

Walkthrough

The package.json was updated to add an "exports" field defining explicit entry points for CommonJS require and typings, including a direct export for "./package.json". The tsconfig.json was extended with new compiler options to allow synthetic default imports, generate declaration maps, and enforce consistent casing in file names. The src/lib/transport.ts import of MailMessage was changed from an internal nodemailer path to a local type. The src/types/transport.ts file added a new exported type alias MailMessage<T> based on the Transport<T> type from nodemailer.

Changes

Cohort / File(s)	Change Summary
Package Configuration `package.json`	Added `"exports"` field with `"."` export for `"require"` and `"types"`, plus an export for `"./package.json"`.
TypeScript Configuration `tsconfig.json`	Added `allowSyntheticDefaultImports`, `declarationMap`, and `forceConsistentCasingInFileNames` compiler options.
Transport Type Import Update `src/lib/transport.ts`	Replaced import of `MailMessage` from internal nodemailer module with import from local `../types/transport`.
Transport Type Definitions `src/types/transport.ts`	Added import of `Transport` from nodemailer and new exported type alias `MailMessage<T>` representing the parameter type of `send`.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Assessment against linked issues

Objective	Addressed	Explanation
Avoid or remove `esModuleInterop` usage (#78)	❌	`esModuleInterop` remains enabled in `tsconfig.json`, no removal or workaround applied.

Assessment against linked issues: Out-of-scope changes

Code Change	Explanation
Addition of `"exports"` field in `package.json`	Not related to the esModuleInterop issue; focused on module resolution and package entry points.
Addition of new type alias `MailMessage<T>`	Type definition enhancement unrelated to esModuleInterop concern.
Import source change for `MailMessage` in transport.ts	Refactoring type import source, unrelated to esModuleInterop issue.

Suggested reviewers

vittorius
mklocek

Poem

In the garden of code, a bunny hops with glee,
Tweaking configs for all the world to see.
Modules now clear, exports in a row,
TypeScript and JavaScript in harmony flow.
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This rabbit says, “Your builds will fly!” 🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 715a0a4 and 1d55982.

📒 Files selected for processing (2)

src/lib/transport.ts (1 hunks)
src/types/transport.ts (2 hunks)

✅ Files skipped from review due to trivial changes (1)

src/lib/transport.ts

🔇 Additional comments (2)

src/types/transport.ts (2)

3-3: LGTM! Import addition supports the new type alias.

Adding the Transport import is necessary for the new MailMessage type alias and maintains consistency with the existing Transporter import.

55-55: Excellent solution for avoiding internal module dependencies.

The MailMessage<T> type alias cleverly extracts the mail message type from the public Transport API using TypeScript's utility types. This approach eliminates the need to import from nodemailer's internal paths like "nodemailer/lib/mailer/mail-message", which should help resolve the esModuleInterop requirement mentioned in issue #78.

The use of Parameters<Transport<T>["send"]>[0] is a sophisticated type-level solution that maintains type safety while improving module compatibility.

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coderabbitai

Actionable comments posted: 1

🧹 Nitpick comments (1)

tsconfig.json (1)
10-14: isolatedModules: false is redundant & may hinder some build-time tooling

isolatedModules defaults to false; persisting it explicitly adds no value and can trip tools such as Vite/ESBuild that expect it to be true (or absent) when performing per-file transpilation. Unless you have a concrete reason to disable isolated compilation, drop the flag to keep the config minimal and interoperable.
-    "isolatedModules": false

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📥 Commits

Reviewing files that changed from the base of the PR and between ffeca33 and 87ad0db.

📒 Files selected for processing (2)

package.json (1 hunks)
tsconfig.json (1 hunks)

package.json

…iguration

VladimirTaytor · 2025-07-24T16:26:50Z

tsconfig.json

+    "allowSyntheticDefaultImports": true,
+    "declarationMap": true,
+    "forceConsistentCasingInFileNames": true,
+    "isolatedModules": false


CodeRabbit says we can skip this, is it true?

…TypeScript configuration

truthhonestmessaging · 2025-07-25T19:32:46Z

Even after doing this I get this errors:

node_modules/mailtrap/dist/lib/transport.d.ts:2:8 - error TS1259: Module '"/Users/inhohwang/Desktop/Backend/Truth/functions/node_modules/@types/nodemailer/lib/mailer/mail-message"' can only be default-imported using the 'esModuleInterop' flag

2 import MailMessage from "nodemailer/lib/mailer/mail-message";
~~~~~~~~~~~

node_modules/@types/nodemailer/lib/mailer/mail-message.d.ts:32:1
32 export = MailMessage;
~~~~~~~~~~~~~~~~~~~~~
This module is declared with 'export =', and can only be used with a default import when using the 'esModuleInterop' flag.

Found 1 error in node_modules/mailtrap/dist/lib/transport.d.ts:2

vittorius · 2025-07-29T05:50:24Z

Hey @truthhonestmessaging. Maybe you could provide us with a repo with a sample project (e.g. derived from your current one but with any sensitive details stripped away)? Because we've tried using this version of mailtrap-nodejs in different JS/TS codebases, and spotted no issues.

truthhonestmessaging · 2025-07-29T13:40:10Z

No, because what you are asking is too much for me to do the answer is no.

I want to help though. Because of this bug, I ended up forced having to be use esModuleInterop. There is no other way. This is at the very least code smell, and I am afraid it messed up my other imports in my entire project. Doing things like this "adding esModuleInterop" is risky for projects like mine, I think you guys should fix it so that this library compiles without esModuleInterop on, but I am using this flag, and things seem fine so far, but ideally this flag should be removed.

…sage for improved type safety

narekhovhannisyan · 2025-07-31T06:35:32Z

Hi @truthhonestmessaging, can you please double-check if the last commits fix the problem on your side?

feat: enhance package configuration with module exports and TypeScrip…

87ad0db

…t settings

narekhovhannisyan requested review from vittorius, mklocek and VladimirTaytor July 24, 2025 08:25

narekhovhannisyan self-assigned this Jul 24, 2025

coderabbitai bot reviewed Jul 24, 2025

View reviewed changes

package.json Outdated Show resolved Hide resolved

chore: remove module entry from package.json exports for cleaner conf…

6c35f7e

…iguration

VladimirTaytor approved these changes Jul 24, 2025

View reviewed changes

chore: remove isolatedModules setting from tsconfig.json for cleaner …

715a0a4

…TypeScript configuration

narekhovhannisyan added 2 commits July 31, 2025 10:31

fix: import MailMessage in transport.ts for proper type usage

21317ff

fix: update transport.ts to include Transport type and define MailMes…

1d55982

…sage for improved type safety

mklocek removed their request for review August 6, 2025 11:45

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Enhance package configuration with module exports and TypeScript settings #81

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