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Felix Haus

Developer

Felix Haus

472867+ofhouse@users.noreply.github.com

14 commits~7 files/commit

Performance

2026Previous year

Insights

Key patterns and highlights from this developer's activity.

Peak MonthMar'2680 performance
Growth Trend↑475%vs prior period
Avg Files/Commit7files per commit
Active Days14of 455 days
Top Repovercel14 commits

Effort Over Time

Breakdown of growth, maintenance, and fixes effort over time.

Bug Behavior

Beta

Bugs introduced vs. fixed over time.

Investment Quality

Beta

Reclassifies engineering effort based on bug attribution. Commits that introduced bugs are retrospectively counted as poor investments.

49%Productive TimeGrowth 31% + Fixes 69%
45%Maintenance Time
6%Wasted Time
How it works

Methodology

Investment Quality reclassifies engineering effort based on bug attribution data. Commits identified as buggy origins (those that introduced bugs later fixed by someone) have their grow and maintenance time moved into the Wasted Time category. Their waste (fix commits) remains counted as productive. All other commits retain their standard classification: grow is productive, maintenance is maintenance, and waste (fixes) is productive.

Relationship to Growth / Maintenance / Fixes

The standard model classifies commits as Growth, Maintenance, or Fixes. Investment Quality adds a quality lens: a commit that introduced a bug is retrospectively counted as a poor investment — the engineering time spent on it was wasted because it ultimately required additional fix work. Fix commits (Fixes in the standard model) are reframed as productive, because fixing bugs is valuable work.

Proposed API Endpoint

Currently computed client-side from commit and bug attribution data. Ideal server-side endpoint:

POST /v1/organizations/{orgId}/investment-quality
Content-Type: application/json

Request:
{
  "startTime": "2025-01-01T00:00:00Z",
  "endTime": "2025-12-31T23:59:59Z",
  "bucketSize": "BUCKET_SIZE_MONTH",
  "groupBy": ["repository_id" | "deliverer_email"]
}

Response:
{
  "productivePct": 74,
  "maintenancePct": 18,
  "wastedPct": 8,
  "buckets": [
    {
      "bucketStart": "2025-01-01T00:00:00Z",
      "productive": 4.2,
      "maintenance": 1.8,
      "wasted": 0.6
    }
  ]
}

Recent Activity

Latest analyzed commits from this developer.

HashMessageDateFilesEffort
ca59f61This commit introduces **`--archive` flag support** to the **`vercel deploy continue` command**, aligning its functionality with the standard `deploy` command. It **enhances the `@vercel/client` package** by refactoring tarball creation into a shared `createTgzFiles` utility, which is now utilized by both `createDeployment` and `continueDeployment`. A key aspect of this **new capability** is the special handling of `provision.json`, which is now excluded from the tarball and sent as a standalone file when `--archive=tgz` is used, ensuring the API can inspect it pre-build. This **feature addition and refactoring** improves deployment efficiency and consistency across CLI commands, with comprehensive unit tests added to cover the new behavior.Mar 259maint
8a18cc5This commit introduces a **bug fix** and **enhancement** to the **Vercel CLI's `deploy` command**, specifically when using the `--json` flag. Previously, failed deployments (due to build errors, cancellations, or failed checks) would not output JSON, hindering automation. Now, the **CLI** consistently outputs a JSON object containing deployment information and an `error` field for all deployment outcomes, including failures. This change significantly improves the **scriptability and reliability** of automated workflows that parse `vercel deploy` output, ensuring a predictable JSON response for all scenarios.Mar 123waste
3f9e991This commit introduces a **new capability** to the **`@vercel/cli`** by adding `--json` and `--format=json` flags to the `vc deploy init` command. This enhancement allows the command to output critical deployment details, such as `id` and `url`, in a **machine-readable JSON format** to stdout, significantly improving its utility for **automation scripts**. The change also includes telemetry tracking for flag usage, suppresses the bare URL output when JSON is requested to prevent malformed output, and is thoroughly covered by new unit tests. This **feature** streamlines programmatic interaction with the deployment initialization process, making it easier to integrate into CI/CD pipelines.Mar 54grow
fc357e1This commit introduces a **memory efficiency improvement** within the **`build-utils` package**, specifically in the `FileBlob.fromStream()` method. It **refactors** the stream collection logic to avoid unnecessary `Buffer` copies by checking if incoming chunks are already buffers before processing. This **optimization** significantly **reduces peak memory usage** from approximately 3x to 2x the file size when handling large streams, preventing redundant data duplication and improving overall resource management.Feb 52maint
ee44634This commit introduces significant **performance optimizations** and **refactoring** to the **`build-utils` package**'s Node.js version detection logic. The `isNodeVersionAvailable` function now uses `statSync({ throwIfNoEntry: false })` for more efficient filesystem checks, replacing a less performant try-catch pattern. Crucially, `getAvailableNodeVersions` is optimized to **skip filesystem checks for Node.js versions older than 18**, as these are discontinued and not present in the build container, thereby reducing unnecessary I/O operations. This **maintenance** work also updates an error message to explicitly mention "discontinued" versions, providing clearer guidance to users requesting unsupported Node.js runtimes and resulting in **faster Node.js version resolution** within the build process.Jan 223maint
8e4b946This commit performs a **monorepo-wide dependency upgrade** by updating `@types/node` to `20.11.0` across all relevant packages. It introduces the `syncpack` tool to **enforce consistent versioning** for this critical dependency, adding a new **CI check** to prevent future discrepancies in the `.github/workflows/test-lint.yml` workflow. This **maintenance** effort addresses compatibility issues with the project's TypeScript 4.9.5, which cannot parse newer `@types/node` versions, and includes **type compatibility fixes** in modules such as `@vercel/cervel`, `@vercel/cli`, and `@vercel/go`. The overall impact is a more stable and consistent development environment for Node.js-related code by standardizing type definitions.Jan 2151waste
1869672This commit introduces a **performance optimization** within the **`build-utils` package** by refactoring how `package.json` files are located. Previously, the `getNodeVersion` utility unnecessarily scanned for and parsed multiple lockfiles when it only required `package.json` information. A new, lightweight `findPackageJson` utility has been added to specifically locate `package.json` without lockfile scanning, and `getNodeVersion` now utilizes this function. This **refactoring** significantly **improves performance** by reducing file system I/O and parsing overhead for operations dependent on `getNodeVersion`.Jan 194maint
06bf941This commit **enhances the Go builder** by explicitly setting the `runtimeLanguage` property to `'go'` when creating Lambda functions. This ensures that **Go-based serverless functions** are correctly identified within the Vercel platform. It represents a **new capability** for the Go runtime, improving metadata accuracy and enabling proper classification. This change is dependent on a prior update to `@vercel/build-utils` to support `'go'` as a valid runtime language, crucial for the **proper classification and handling of Go-based serverless functions**.Jan 163grow
f46cab8This commit **introduces support for 'go' as a valid runtime language option** within the **`@vercel/build-utils` package**. It **extends the `LambdaExecutableRuntimeLanguages` type** and updates the `Lambda` constructor's validation logic in `src/lambda.ts` to correctly accept `'go'`, mirroring the existing support for `'rust'`. This **new capability** is a foundational step towards enabling Go-based serverless functions on Vercel, ensuring the build system can validate this new runtime. The actual Go builder integration will be implemented in a subsequent release, building upon this core validation change.Jan 153maint
0bef8e2This commit **disables automatic Sentry session tracking** within the **CLI module**. By setting `autoSessionTracking` to `false` during Sentry initialization in `packages/cli/src/index.ts`, this **configuration change** prevents the CLI from automatically sending session-related data. This **maintenance task** reduces data collection overhead and enhances user privacy for CLI interactions.Jan 62maint
c53c7b7This commit **expands the CI test matrix** to include **Node.js 24.x**, ensuring the project's compatibility with the latest runtime. It updates the `.github/workflows/test.yml` configuration to run tests against `node24` and upgrades the `@datadog/datadog-ci` uploader to version `4.2.2`. To address an `npm` issue on Windows with Node.js 24, the workflow now uses `pnpm dlx` instead of `npx`. Furthermore, `utils/chunk-tests.js` is updated to support Node.js 24 and utilize the `node:` prefix for built-in module imports. This **maintenance** work significantly enhances the project's **CI/CD pipeline** and test coverage.Dec 13grow
2beb122This commit **enables default support for Node.js 24.x** within the build system, specifically impacting the **`build-utils`** package. It **removes the temporary environment variable check** that previously issued a warning when running local builds with Node.js 24.x, effectively making Node.js 24.x a fully supported version. This **feature enablement** improves the developer experience by allowing users to seamlessly use Node.js 24.x without encountering deprecation warnings. Extensive **unit and integration tests** across the `build-utils`, `cli`, and `node` packages were updated to reflect this new default support and ensure correct behavior.Nov 258maint
0a1db0dThis commit performs **maintenance** within the **`build-utils`** package by **removing the deprecated `--unsafe-perm` flag** from `npm install` commands. Specifically, the `getInstallCommandForPackageManager` function in `packages/build-utils/src/fs/run-user-scripts.ts` no longer includes this flag, which was causing **deprecation warnings** with `npm` v11 (bundled with Node.js 24). This **refactoring** ensures cleaner build logs and prevents potential breakage in future `npm` versions, as the flag has been irrelevant since `npm` v7. The change improves the **reliability of the build process** by aligning with modern `npm` behavior.Nov 202maint
f843e14This commit introduces **experimental support for Node.js v24** within the **`build-utils`** package, allowing it to be recognized and used when a specific environment variable is set. It implements new logic in `packages/build-utils/src/fs/node-version.ts` to conditionally enable this latest Node.js runtime, mirroring the approach taken for previous major versions. This **new capability** empowers developers to opt-in and test their projects with Node.js v24, enhancing the platform's compatibility with cutting-edge environments. Comprehensive unit tests have been added to validate the correct behavior of this conditional version allowance.Oct 283maint
ca59f61Mar 25

This commit introduces **`--archive` flag support** to the **`vercel deploy continue` command**, aligning its functionality with the standard `deploy` command. It **enhances the `@vercel/client` package** by refactoring tarball creation into a shared `createTgzFiles` utility, which is now utilized by both `createDeployment` and `continueDeployment`. A key aspect of this **new capability** is the special handling of `provision.json`, which is now excluded from the tarball and sent as a standalone file when `--archive=tgz` is used, ensuring the API can inspect it pre-build. This **feature addition and refactoring** improves deployment efficiency and consistency across CLI commands, with comprehensive unit tests added to cover the new behavior.

9 filesmaint
8a18cc5Mar 12

This commit introduces a **bug fix** and **enhancement** to the **Vercel CLI's `deploy` command**, specifically when using the `--json` flag. Previously, failed deployments (due to build errors, cancellations, or failed checks) would not output JSON, hindering automation. Now, the **CLI** consistently outputs a JSON object containing deployment information and an `error` field for all deployment outcomes, including failures. This change significantly improves the **scriptability and reliability** of automated workflows that parse `vercel deploy` output, ensuring a predictable JSON response for all scenarios.

3 fileswaste
3f9e991Mar 5

This commit introduces a **new capability** to the **`@vercel/cli`** by adding `--json` and `--format=json` flags to the `vc deploy init` command. This enhancement allows the command to output critical deployment details, such as `id` and `url`, in a **machine-readable JSON format** to stdout, significantly improving its utility for **automation scripts**. The change also includes telemetry tracking for flag usage, suppresses the bare URL output when JSON is requested to prevent malformed output, and is thoroughly covered by new unit tests. This **feature** streamlines programmatic interaction with the deployment initialization process, making it easier to integrate into CI/CD pipelines.

4 filesgrow
fc357e1Feb 5

This commit introduces a **memory efficiency improvement** within the **`build-utils` package**, specifically in the `FileBlob.fromStream()` method. It **refactors** the stream collection logic to avoid unnecessary `Buffer` copies by checking if incoming chunks are already buffers before processing. This **optimization** significantly **reduces peak memory usage** from approximately 3x to 2x the file size when handling large streams, preventing redundant data duplication and improving overall resource management.

2 filesmaint
ee44634Jan 22

This commit introduces significant **performance optimizations** and **refactoring** to the **`build-utils` package**'s Node.js version detection logic. The `isNodeVersionAvailable` function now uses `statSync({ throwIfNoEntry: false })` for more efficient filesystem checks, replacing a less performant try-catch pattern. Crucially, `getAvailableNodeVersions` is optimized to **skip filesystem checks for Node.js versions older than 18**, as these are discontinued and not present in the build container, thereby reducing unnecessary I/O operations. This **maintenance** work also updates an error message to explicitly mention "discontinued" versions, providing clearer guidance to users requesting unsupported Node.js runtimes and resulting in **faster Node.js version resolution** within the build process.

3 filesmaint
8e4b946Jan 21

This commit performs a **monorepo-wide dependency upgrade** by updating `@types/node` to `20.11.0` across all relevant packages. It introduces the `syncpack` tool to **enforce consistent versioning** for this critical dependency, adding a new **CI check** to prevent future discrepancies in the `.github/workflows/test-lint.yml` workflow. This **maintenance** effort addresses compatibility issues with the project's TypeScript 4.9.5, which cannot parse newer `@types/node` versions, and includes **type compatibility fixes** in modules such as `@vercel/cervel`, `@vercel/cli`, and `@vercel/go`. The overall impact is a more stable and consistent development environment for Node.js-related code by standardizing type definitions.

51 fileswaste
1869672Jan 19

This commit introduces a **performance optimization** within the **`build-utils` package** by refactoring how `package.json` files are located. Previously, the `getNodeVersion` utility unnecessarily scanned for and parsed multiple lockfiles when it only required `package.json` information. A new, lightweight `findPackageJson` utility has been added to specifically locate `package.json` without lockfile scanning, and `getNodeVersion` now utilizes this function. This **refactoring** significantly **improves performance** by reducing file system I/O and parsing overhead for operations dependent on `getNodeVersion`.

4 filesmaint
06bf941Jan 16

This commit **enhances the Go builder** by explicitly setting the `runtimeLanguage` property to `'go'` when creating Lambda functions. This ensures that **Go-based serverless functions** are correctly identified within the Vercel platform. It represents a **new capability** for the Go runtime, improving metadata accuracy and enabling proper classification. This change is dependent on a prior update to `@vercel/build-utils` to support `'go'` as a valid runtime language, crucial for the **proper classification and handling of Go-based serverless functions**.

3 filesgrow
f46cab8Jan 15

This commit **introduces support for 'go' as a valid runtime language option** within the **`@vercel/build-utils` package**. It **extends the `LambdaExecutableRuntimeLanguages` type** and updates the `Lambda` constructor's validation logic in `src/lambda.ts` to correctly accept `'go'`, mirroring the existing support for `'rust'`. This **new capability** is a foundational step towards enabling Go-based serverless functions on Vercel, ensuring the build system can validate this new runtime. The actual Go builder integration will be implemented in a subsequent release, building upon this core validation change.

3 filesmaint
0bef8e2Jan 6

This commit **disables automatic Sentry session tracking** within the **CLI module**. By setting `autoSessionTracking` to `false` during Sentry initialization in `packages/cli/src/index.ts`, this **configuration change** prevents the CLI from automatically sending session-related data. This **maintenance task** reduces data collection overhead and enhances user privacy for CLI interactions.

2 filesmaint
c53c7b7Dec 1

This commit **expands the CI test matrix** to include **Node.js 24.x**, ensuring the project's compatibility with the latest runtime. It updates the `.github/workflows/test.yml` configuration to run tests against `node24` and upgrades the `@datadog/datadog-ci` uploader to version `4.2.2`. To address an `npm` issue on Windows with Node.js 24, the workflow now uses `pnpm dlx` instead of `npx`. Furthermore, `utils/chunk-tests.js` is updated to support Node.js 24 and utilize the `node:` prefix for built-in module imports. This **maintenance** work significantly enhances the project's **CI/CD pipeline** and test coverage.

3 filesgrow
2beb122Nov 25

This commit **enables default support for Node.js 24.x** within the build system, specifically impacting the **`build-utils`** package. It **removes the temporary environment variable check** that previously issued a warning when running local builds with Node.js 24.x, effectively making Node.js 24.x a fully supported version. This **feature enablement** improves the developer experience by allowing users to seamlessly use Node.js 24.x without encountering deprecation warnings. Extensive **unit and integration tests** across the `build-utils`, `cli`, and `node` packages were updated to reflect this new default support and ensure correct behavior.

8 filesmaint
0a1db0dNov 20

This commit performs **maintenance** within the **`build-utils`** package by **removing the deprecated `--unsafe-perm` flag** from `npm install` commands. Specifically, the `getInstallCommandForPackageManager` function in `packages/build-utils/src/fs/run-user-scripts.ts` no longer includes this flag, which was causing **deprecation warnings** with `npm` v11 (bundled with Node.js 24). This **refactoring** ensures cleaner build logs and prevents potential breakage in future `npm` versions, as the flag has been irrelevant since `npm` v7. The change improves the **reliability of the build process** by aligning with modern `npm` behavior.

2 filesmaint
f843e14Oct 28

This commit introduces **experimental support for Node.js v24** within the **`build-utils`** package, allowing it to be recognized and used when a specific environment variable is set. It implements new logic in `packages/build-utils/src/fs/node-version.ts` to conditionally enable this latest Node.js runtime, mirroring the approach taken for previous major versions. This **new capability** empowers developers to opt-in and test their projects with Node.js v24, enhancing the platform's compatibility with cutting-edge environments. Comprehensive unit tests have been added to validate the correct behavior of this conditional version allowance.

3 filesmaint

Work Patterns

Beta

Commit activity distribution by hour and day of week. Shows when this developer is most active.

Collaboration

Beta

Developers who frequently work on the same files and symbols. Higher score means stronger code collaboration.

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OrganizationsDistributionCompareResearch