[deejayem]

nxPreset registers a ts-jest transform, but every project in this workspace overrides it with its own @swc/jest transform, so the entry is resolved by jest at startup yet never executed. ts-jest is not a dependency of any of these projects — it is only pulled in transitively by one example's devDependencies — so any install that does not include that example (e.g. pnpm install --filter "cdktn-cli...") makes every test run fail at config load with "Module ts-jest in the transform option was not found".

Override the inherited transform with an empty map; each project supplies its own.

Related issue

Fixes #381

Description

Make the jest.preset.js transform an empty map.

Checklist

• I have updated the PR title to match CDKTN's style guide
• I have run the linter on my code locally
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas - n/a, the change is too small to need it
• I have made corresponding changes to the documentation if applicable - n/a, none needed
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works if applicable - n/a, this is tested by existing tests passing when using --filter
• New and existing unit tests pass locally with my changes

[sakul-learning]

Verified the reported failure against the PR's merge base (358edc7c39b0b380ba89fd31881f0577fe9b6214) and the fix at head (99e71a15f91133fa0ddeb02a9f843d54120f7b3c) using separate clean source archives.

Reproduction for each revision:

corepack pnpm install --filter "cdktn-cli..." --frozen-lockfile --ignore-scripts
corepack pnpm --filter cdktn-cli exec jest --config jest.config.js --showConfig

• Merge base: the filtered install succeeded, but loading packages/cdktn-cli/jest.config.js exited 1 with Module ts-jest in the transform option was not found. Jest reported <rootDir> as packages/cdktn-cli.
• PR head: the same filtered install and Jest configuration load both succeeded. The resolved transform contains only the package's @swc/jest transformer.

I also checked every current consumer of the root jest.preset.js: all nine package Jest configurations provide their own @swc/jest transform, so clearing the inherited Nx ts-jest transform does not remove a transformer any current consumer relies on.

Configured verification on the PR head also passed:

• pnpm exec jest packages/cdktn/test/validations.test.ts --runInBand — 1 suite, 41 tests, 11 snapshots
• pnpm exec nx build cdktn — successful, 0 errors
• pnpm exec nx test cdktn --runInBand — 43 suites, 542 tests, 301 snapshots

No correctness, security, or artifact-value findings. The one-line transform: {} override is the minimal fix for the reproduced filtered-install failure. Verdict: approve.

[github-actions]

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