CCM-16002 - refactor: remove deprecated baseUrl from tsconfig files

[mjewildnhs]

Description

Replace baseUrl with paths mappings per TS 6.0 migration guide.

• baseUrl: "." removed (paths already used ./ prefixes)
• baseUrl: "src" replaced with paths: { "": ["./src/"] }

Context

baseUrl is deprecated

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

---

Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[Copilot]

Pull request overview

Refactors workspace tsconfig.json files to remove compilerOptions.baseUrl and adjust paths mappings, in preparation for a TypeScript 6 migration.

Changes:

• Removed baseUrl from multiple workspace tsconfig.json files.
• Updated/introduced paths mappings to preserve existing import alias behavior (e.g. src/*, helpers, services/* via wildcard).
• Normalized some path targets to use ./-prefixed relative forms.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tools/client-subscriptions-management/tsconfig.json	Removes baseUrl and adjusts paths for src/* aliasing used by this tool.
tests/test-support/tsconfig.json	Removes baseUrl from test-support tsconfig.
tests/performance/tsconfig.json	Removes baseUrl while retaining paths alias for helpers.
tests/integration/tsconfig.json	Removes baseUrl while retaining paths alias for helpers.
src/models/tsconfig.json	Replaces baseUrl: "src" with a wildcard paths mapping to ./src/*.
src/logger/tsconfig.json	Replaces baseUrl: "src" with a wildcard paths mapping to ./src/*.
lambdas/mock-webhook-lambda/tsconfig.json	Replaces baseUrl: "src" with a wildcard paths mapping to ./src/*.
lambdas/client-transform-filter-lambda/tsconfig.json	Replaces baseUrl: "src" with a wildcard paths mapping to ./src/*.

Comments suppressed due to low confidence (2)

tests/performance/tsconfig.json:6

• This config still uses compilerOptions.paths, but baseUrl was removed. In TypeScript ^5.9.x, paths requires baseUrl; without it tsc will likely fail to parse/validate the config and module resolution (e.g. import ... from "helpers") will break. Reintroduce an appropriate baseUrl (commonly ".").

{
  "compilerOptions": {
    "isolatedModules": true,
    "paths": {
      "helpers": [
        "./helpers/index"

tests/integration/tsconfig.json:6

• This config still uses compilerOptions.paths, but baseUrl was removed. In TypeScript ^5.9.x, paths requires baseUrl; without it tsc will likely error and any configured path aliases may stop working. Reintroduce an appropriate baseUrl (commonly ".").

{
  "compilerOptions": {
    "isolatedModules": true,
    "paths": {
      "helpers": [
        "./helpers/index"

---

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