Continuous Integration for TypeScript

Continuous integration runs repeatable checks when code changes, typically dependency installation, type checking, formatting/linting, unit tests, and build verification. Use a lockfile-based install and a supported runtime version. A green pipeline increases confidence but does not substitute for production monitoring.

The array models independent pipeline gates and the every call combines the results. Real CI executes commands, observes exit codes, and blocks merging when required checks fail.

A CI file listing a step does not guarantee it ran against the intended branch or tool versions; pin and inspect your configuration.

Save as continuous-integration.ts. The following program passed strict TypeScript compilation, and the displayed output was captured by executing its emitted JavaScript with Node.js 22.16.0.

TypeScript source

type Check = { name: string; passed: boolean };
const checks: Check[] = [
  { name: "types", passed: true },
  { name: "tests", passed: true },
  { name: "build", passed: true },
];
console.log(checks.every(check => check.passed) ? "CI checks pass" : "CI failed");

Verified output

CI checks pass

Compile: npx tsc --strict --target es2022 --module commonjs continuous-integration.ts; run: node continuous-integration.js. For Node.js API examples, install @types/node first. For browser projects, use the browser-specific instructions below.

The example demonstrates the code-level behavior; the related configuration or test commands are shown separately when needed.

The array models independent pipeline gates and the every call combines the results. Real CI executes commands, observes exit codes, and blocks merging when required checks fail.

Predict what changes if you alter one input. Then run the code to compare your reasoning with the real output.

Practical project lab: These are real configuration and source-file examples, not a TypeScript object that merely describes settings. Place the files at the named paths relative to one project directory.

.github/workflows/typescript.yml

name: TypeScript checks
on: [push, pull_request]
jobs:
  verify:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '22'
          cache: npm
      - run: npm ci
      - run: npm run check
      - run: npm test
      - run: npm run build

package.json

{"private":true,"scripts":{"check":"tsc --noEmit","test":"node --test","build":"tsc"}}

Commands

git push
Inspect CI results

Commit an npm lockfile and install dependencies before using this workflow.

This project requires its named external tool or dependency and was supplied as setup guidance; it was not claimed as an executed test here.

A CI file listing a step does not guarantee it ran against the intended branch or tool versions; pin and inspect your configuration.

Identify whether the failure is a type-checking issue, a configuration issue, or a runtime behavior issue before choosing a fix.

Write a workflow that runs npm ci, npm run check, npm test, and npm run build using a fixed Node major release.

Write down your expected result first. For configuration examples, compare compiler output and diagnostics; for test examples, make the assertion fail deliberately to verify that the tool reports it.

Continuous integration runs repeatable checks when code changes, typically dependency installation, type checking, formatting/linting, unit tests, and build verification.

Run the primary example, then complete the practice task or environment-specific lab.