chore(project-config): Use mem fs for testing

[Tobbe]

Speed up tests

Note: This PR was initially meant to add a config file cache. But for now I decided that the risk for subtle bugs caused by a stale cache was not worth the unknown benefit of caching the config

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[greptile-apps]

Greptile Summary

This PR speeds up the project-config test suite by replacing on-disk TOML fixture files with an in-memory filesystem (memfs), and simplifies call sites that previously passed an explicit configPath to getConfig / getRawConfig (they now rely on the default path resolution via CEDAR_CWD). The aborted config-cache work was rolled back.

• config.ts: getConfig simplified — configPath is now optional (undefined passes through to getRawConfig's own default), and the double-wrapping try/catch that previously swallowed and re-threw errors from getRawConfig was correctly removed.
• config.test.ts: Fixture files deleted; tests now write TOML content directly into a memfs volume keyed to /cedar-app. Env-var cleanup for API_PORT was also added. Missing vol.reset() in afterEach and no coverage for the ENOENT path.
• dbAuth/api/shared.ts: getPort() refactored to a single try/catch, but this inadvertently broadens the catch to include config parse errors, silently returning 8911 instead of surfacing a malformed cedar.toml.
• cli-helpers/project.ts: getConfig() called without a redundant explicit path argument.

Confidence Score: 4/5

• Safe to merge once the broadened catch scope in getPort() is addressed; test improvements are non-blocking.
• The core change (memfs for tests) is clean and correct. The one concrete behavioral regression is in dbAuth/shared.ts where parse errors in cedar.toml are now silently swallowed and return a default port — this affects only the development-environment error-reporting path, not serverless correctness, so the impact is limited. The two test gaps (missing vol.reset() and absent ENOENT test) are best-practice issues rather than functional bugs.
• packages/auth-providers/dbAuth/api/src/shared.ts — broadened catch scope in getPort()

Important Files Changed

Filename	Overview
packages/project-config/src/config.ts	getConfig simplified: removed the try/catch wrapper (errors are now fully handled inside getRawConfig, avoiding double-wrapping) and dropped configPath default in favour of passing undefined through to getRawConfig. No cache added (intentionally, per PR description).
packages/auth-providers/dbAuth/api/src/shared.ts	getPort() simplified to a single try/catch around getConfig(), but this broadens the catch scope beyond the intended "no cedar.toml in serverless" case: a malformed config file now silently returns 8911 instead of surfacing the parse error.
packages/project-config/src/tests/config.test.ts	Tests migrated from on-disk fixture files to memfs inline JSON; API_PORT env var cleanup added. Missing vol.reset() in afterEach and the ENOENT error path is no longer explicitly tested.
packages/cli-helpers/src/lib/project.ts	updateTomlConfig simplified: getConfig() called without an explicit path (relies on CEDAR_CWD, consistent with how getConfigPath() already resolves the path just above it).
packages/project-config/src/tests/fixtures/redwood.toml	Deleted — content inlined into tests using memfs.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[caller invokes getConfig] --> B{configPath provided?}
    B -- yes --> C[pass configPath to getRawConfig]
    B -- no --> D[getRawConfig uses default: getConfigPath]
    D --> E{CEDAR_CWD set?}
    E -- yes --> F[findUp cedar.toml from CEDAR_CWD]
    E -- no --> G[findUp cedar.toml from process.cwd]
    F --> H{file found?}
    G --> H
    H -- no --> I[throw: not a Cedar project]
    H -- yes --> J[cache path in getConfigPathCache]
    C --> K[fs.readFileSync configPath]
    J --> K
    K --> L{read success?}
    L -- no --> M[throw: Could not parse ...]
    L -- yes --> N[envInterpolation]
    N --> O[toml.parse]
    O --> P{parse success?}
    P -- no --> M
    P -- yes --> Q[merge DEFAULT_CONFIG with rawConfig]
    Q --> R[return Config]

    style I fill:#f88,color:#000
    style M fill:#f88,color:#000
    style R fill:#8f8,color:#000

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_{Reviews (2): Last reviewed commit: "tweak jsdoc" | Re-trigger Greptile}

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☁️ Nx Cloud last updated this comment at 2026-03-24 13:13:12 UTC

[Tobbe]

@greptileai please do a full review again

[github-actions]

The changes in this PR are now available on npm.

Try them out by running yarn cedar upgrade -t 4.0.0-canary.13664