Digitraffic-common

This is a place for common utilities and classes that can be used in other cdk-projects.

Setup

Initialize the project scripts by running the following command. This only needs to be done once, after cloning or pulling the repository for the first time. It will install/reinstall lefthook git hooks.

pnpm run setup

After that approve esbuild:

pnpm approve-builds

And then run again the setup.

How to build

Use pnpm to build the code i.e.

pnpm install
pnpm run build
pnpm run test
pnpm run test --test-path-pattern 'dt-logger.test'
pnpm run test:watch
pnpm run test:watch --test-path-pattern 'dt-logger.test'

Format code

pnpm run format:package-json # Format package.json
pnpm run format:check # Checks all files
pnpm run format:check-staged # Checks stagged files
pnpm run format:fix # Format all files
pnpm run format:fix-staged # Formats stagged files

Update deps

This project uses exact dependency versions (no semver ranges) and has a 7-day cooldown defined in .npmrc.

Full update workflow

1. Update all dependencies (deps, peerDeps, and Node version in .npmrc):

   pnpm deps:update-all

   This updates package.json, pnpm-lock.yaml, and installs everything in one step — no separate pnpm install needed. What pnpm deps:update-all does:

   • Runs pnpm up --latest for all packages except those listed in pnpm.updateConfig.ignoredPackages in package.json (e.g. typescript, @types/node)
   • Updates all peerDependencies to latest (same exclusions apply)
   • Updates .npmrc use-node-version to the newest Node release that is older than minimum-release-age and matches engines.node

   See scripts/update-deps-and-peers.ts for implementation details.

   Also update packageManager manually — it is not touched by the script. Check the latest pnpm 10.x version (older than 7 days) at https://www.npmjs.com/package/pnpm?activeTab=versions and update package.json:

   "packageManager": "[email protected]"

   See DEPENDENCY_OVERRIDES.md for details.

2. Check for vulnerabilities:

   pnpm audit

   If vulnerabilities are reported in transitive dependencies, add or update overrides in package.json and/or exclusions in .npmrc.

3. Check if existing overrides can be removed — existing overrides may no longer be needed if upstream dependencies now pull in a safe version. Test each override by temporarily removing it, reinstalling, and re-running pnpm audit:

   # Remove the override from package.json, then do a fresh resolution:
   rm -rf node_modules pnpm-lock.yaml && pnpm install
   pnpm audit

   If no vulnerabilities are reported, the override is no longer needed — keep it removed. If vulnerabilities reappear, restore the override. See DEPENDENCY_OVERRIDES.md for details.

4. Build and test:

   pnpm run build
   pnpm run test

5. Commit and open a pull request

   Do the work on a feature branch so changes can be reviewed before merging.

6. Publish a new version — once the pull request is merged to master, publish so downstream projects pick up the changes (especially important for security fixes):

   ./scripts/publish.sh

   See Publishing to npmjs.com below for details.

See DEPENDENCY_OVERRIDES.md for detailed instructions on adding, updating, and removing overrides and .npmrc exclusions.

Publishing to npmjs.com

See https://www.npmjs.com/package/@digitraffic/common

To publish using today's date as the version number:

./scripts/publish.sh

To publish with a specific version number:

./scripts/publish.sh 2026.8.6-1

How to use

In package.json dependencies:

"dependencies": {
  "@digitraffic/common": "*",
}

In code:

import {DigitrafficStack, StackConfiguration} from "@digitraffic/common/dist/aws/infra/stack/stack";

DigitrafficStack

If you extend your stack from DigitrafficStack you get many benefits:

• Secret, VPC, Sg & alarmTopics automatically
• Stack validation with StackCheckingAspect
• Easier configuration with StackConfiguration

If you do not need those things, you should not use DigitrafficStack.

StackConfiguration

Commonly used parameters are predefined in StackConfiguration. Write the configuration for your environments once and reuse it across cdk-projects.

StackCheckingAspect

Uses cdk aspects to do some sanity checking for your cdk stack:

• Stack naming check (Test/Prod in name)
• Function configuration (memory, timeout, runtime, reservedConcurrency)
• Tags, must have Solution tag defined
• S3 Buckets, no public access
• Api Gateway resource casing (kebabCase and snake_case)
• Queue encrypting
• LogGroup Retention

You can use StackCheckingAspect for any stack, DigitrafficStack does it automatically, but you can call it manually:

Aspects.of(this).add(StackCheckingAspect.create(this));

Any resource can be whitelisted by giving it as a parameter or in the StackConfiguration

FunctionBuilder

FunctionBuilder allows you to make lambdas with alarms on memory usage and timeouts.

By default, the created function has access to database, but this can of course be controlled.

Creating lambda is easy:

const lambda = FunctionBuilder.create(stack, "get-metadata")
  .withTimeout(Duration.seconds(2))
  .build();

See the documentation for more information.