Convert errors.js to TypeScript

[adespawn]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 77188330-97d2-46a0-be3e-c231493cd4b6

📥 Commits

Reviewing files that changed from the base of the PR and between 4280bc0 and 41282e3.

📒 Files selected for processing (3)

• lib/.gitignore
• lib/errors.ts
• main.d.ts

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[Copilot]

Pull request overview

This PR converts the driver’s errors implementation to TypeScript and updates the public TypeScript entrypoint (main.d.ts) to re-export the errors module instead of inlining error type declarations.

Changes:

• Re-export ./lib/errors from main.d.ts and remove the previously inlined errors namespace declarations.
• Convert lib/errors to a typed TypeScript module with explicit exports.
• Update lib/.gitignore to ignore generated errors.js / errors.d.ts build artifacts.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
main.d.ts	Switches from an inlined errors namespace to export * as errors from "./lib/errors".
lib/errors.ts	Adds TypeScript typings and converts CommonJS exports to ES exports for driver error classes.
lib/.gitignore	Ignores generated outputs for the new TS-based errors module.

Comments suppressed due to low confidence (2)

lib/errors.ts:28

• NoHostAvailableError currently types innerErrors as a non-null object map, but at least one runtime call site passes null (e.g. lib/client.js throws new errors.NoHostAvailableError(null, ...)). With strict enabled, this makes the generated typings inconsistent with actual usage.
  lib/errors.ts:35
• NoHostAvailableError's message parameter is typed as required, but the driver constructs this error without a message (see test/unit-not-supported/error-tests.js: new errors.NoHostAvailableError({})). This is a public API typing regression and also forces you to pass undefined through super(message). Make message optional and pass a safe default string to super.

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