feat: improve tsconfig

[hugop95]

This PR simply strengthen typings by improving the tsconfig configuration, and fixing related errors.

Changes

Added in this PR:

• allowUnreachableCode: false
• allowUnusedLabels: false
• noImplicitAny: true (was false)
• noImplicitThis: true (was false)
• strict: true
• useUnknownInCatchVariables: true
• skipLibCheck: true

Removed:

• strictNullChecks: false (now covered by strict: true)

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[hugop95]

@reviewers

❓ What is the error?

node_modules/mongodb-memory-server-core/lib/util/utils.d.ts:10:25 - error TS7016: Could not find a declaration file for module 'semver'. '/Users/hugo.prunaux/Desktop/dev/work/mongo-bulk-data-migration/node_modules/semver/index.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/semver` if it exists or add a new declaration (.d.ts) file containing `declare module 'semver';`

10 import * as semver from 'semver';
                           ~~~~~~~~


Found 1 error in node_modules/mongodb-memory-server-core/lib/util/utils.d.ts:10

[Copilot]

Pull request overview

This PR tightens TypeScript type-checking via tsconfig updates and resolves the resulting type errors across core migration logic and test utilities.

Changes:

• Enable stricter TypeScript compiler options (strict, noImplicit*, etc.) and adjust configuration accordingly.
• Fix/adjust typings in source and test utility code to satisfy stricter compilation.
• Update MongoDB test helper usage (db.command) and add global typings for test runtime globals.

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tsconfig.json	Adds stricter compiler options and restructures type-checking config.
src/tools/arrayFilters.ts	Tightens typings for arrayFilters and adjusts regex match handling.
src/testUtils/doRollbackAndAssertForInitialState.ts	Adds explicit typings for shared test helpers.
src/MongoBulkDataMigration.ts	Makes catch-block error narrowing compatible with stricter TS settings.
src/lib/computeRollbackQuery.ts	Narrows type of unsetAdditionalPositional for stricter checking.
src/lib/AbstractBulkOperationResults.ts	Refactors bulk re-initialization to satisfy stricter initialization/typing.
testsUtils/mongoValidation.ts	Switches to Db.command() in test utility.
testsUtils/globals.d.ts	Declares typed global variables used by tests.
tests/MongoBulkDataMigration.update.test.ts	Fixes update variable typing to reflect actual function shape.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[pp0rtal]

@hugop95 Thank you!! 🚀
It should have been strict since the project was created 🙌