@typescript-eslint/project-service 8.69.0: createProjectService

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify @typescript-eslint/project-service.createProjectService in pkg:npm/%40typescript-eslint/project-service@8.69.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40typescript-eslint/project-service@8.69.0
Demonstrate these symbols/APIs:
  - @typescript-eslint/project-service.createProjectService
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:87973d0e253013c4e5ad984d2c7c787d5e0cb7678dc7cf5404485f2c2cf9a72b","constraints":{"executionContext":"node"},"contract":["createProjectService returns ProjectServiceAndMetadata with configured options and timestamp","service opens TypeScript source file associating it with tsconfig.json","service retrieves open ScriptInfo confirming file is tracked","service opens standalone file permitted by allowDefaultProject"],"goal":"verify @typescript-eslint/project-service.createProjectService in pkg:npm/%40typescript-eslint/project-service@8.69.0","kind":"HOW","packages":["pkg:npm/%40typescript-eslint/project-service@8.69.0"],"schemaVersion":1,"symbols":["@typescript-eslint/project-service.createProjectService"]},"contractCommand":["node","test/contract.cjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40typescript-eslint/project-service@8.69.0"],"schemaVersion":1,"subject":"pkg:npm/%40typescript-eslint/project-service@8.69.0","symbols":["@typescript-eslint/project-service.createProjectService"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-project-service-create",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-project-service-create",
      "version": "1.0.0",
      "dependencies": {
        "@typescript-eslint/project-service": "8.69.0",
        "typescript": "5.7.3"
      }
    },
    "node_modules/@typescript-eslint/project-service": {
      "version": "8.69.0",
      "resolved": "https://registry.npmjs.org/@typescript-eslint/project-service/-/project-service-8.69.0.tgz",
      "integrity": "sha512-yi4obFrHMmnsesWehHbkg9zMA7Jt8cXT+mKM08G999pH1yT6nqgsHx7MYm0uY1wAj8CqiBXYRJ7WAT0QdQHQXg==",
      "license": "MIT",
      "dependencies": {
        "@typescript-eslint/tsconfig-utils": "^8.69.0",
        "@typescript-eslint/types": "^8.69.0",
        "debug": "^4.4.3"
      },
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      },
      "funding": {
        "type": "opencollective",
        "url": "https://opencollective.com/typescript-eslint"
      },
      "peerDependencies": {
        "typescript": ">=4.8.4 <6.1.0"
      }
    },
    "node_modules/@typescript-eslint/tsconfig-utils": {
      "version": "8.71.1",
      "resolved": "https://registry.npmjs.org/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.71.1.tgz",
      "integrity": "sha512-oTvkml5SxXhgg+WWKhod5qWQICDXtOB+/Hi9VdPKFAANJ2b7YOgMffgvzXuqog7R6A/JtrzRf128dsxummyWhg==",
      "license": "MIT",
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      },
      "funding": {
        "type": "opencollective",
        "url": "https://opencollective.com/typescript-eslint"
      },
      "peerDependencies": {
        "typescript": ">=4.8.4 <6.1.0"
      }
    },
    "node_modules/@typescript-eslint/types": {
      "version": "8.71.1",
      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-8.71.1.tgz",
      "integrity": "sha512-ybYnPTUwg3VQQOFEiBPLs8Jxl1ry2vXdn1kVKguomBbvxpetdu3MKTNDqFNUrlG8ylP9MpZosmXMFYlGQHk1oQ==",
      "license": "MIT",
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      },
      "funding": {
        "type": "opencollective",
        "url": "https://opencollective.com/typescript-eslint"
      }
    },
    "node_modules/debug": {
      "version": "4.4.3",
      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
      "license": "MIT",
      "dependencies": {
        "ms": "^2.1.3"
      },
      "engines": {
        "node": ">=6.0"
      },
      "peerDependenciesMeta": {
        "supports-color": {
          "optional": true
        }
      }
    },
    "node_modules/ms": {
      "version": "2.1.3",
      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
      "license": "MIT"
    },
    "node_modules/typescript": {
      "version": "5.7.3",
      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.3.tgz",
      "integrity": "sha512-84MVSjMEHP+FQRPy3pX9sTVV/INIex71s9TL2Gm5FG/WG1SqXeKyZ0k7/blY/4FdOzI12CBy1vGc4og/eus0fw==",
      "license": "Apache-2.0",
      "bin": {
        "tsc": "bin/tsc",
        "tsserver": "bin/tsserver"
      },
      "engines": {
        "node": ">=14.17"
      }
    }
  }
}

{
  "name": "sample-project-service-create",
  "version": "1.0.0",
  "description": "Clean-room code sample verifying @typescript-eslint/project-service.createProjectService in @typescript-eslint/project-service@8.69.0",
  "main": "src/index.ts",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "dependencies": {
    "@typescript-eslint/project-service": "8.69.0",
    "typescript": "5.7.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @typescript-eslint/project-service.createProjectService in pkg:npm/%40typescript-eslint/project-service@8.69.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40typescript-eslint/project-service@8.69.0"
  ],
  "symbols": [
    "@typescript-eslint/project-service.createProjectService"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

export function greet(name: string): string {
  return `Hello, ${name}!`;
}

export const ANSWER = 42;

const assert = require('assert');
const path = require('path');
const { createProjectService } = require('@typescript-eslint/project-service');

function runContract() {
  const rootDir = path.resolve(__dirname, '..');
  const result = createProjectService({
    tsconfigRootDir: rootDir,
    options: {
      defaultProject: 'tsconfig.json',
      maximumDefaultProjectFileMatchCount_THIS_WILL_SLOW_DOWN_LINTING: 10,
      allowDefaultProject: ['src/standalone.ts']
    }
  });

  // Assertion 1: createProjectService returns ProjectServiceAndMetadata with configured options and timestamp
  assert(result !== null && typeof result === 'object', 'Result must be an object');
  assert(result.service !== null && typeof result.service === 'object', 'service must be an object');
  assert(typeof result.lastReloadTimestamp === 'number' && result.lastReloadTimestamp > 0, 'lastReloadTimestamp must be a positive number');
  assert.strictEqual(result.maximumDefaultProjectFileMatchCount, 10, 'maximumDefaultProjectFileMatchCount must match configured value');
  assert.deepStrictEqual(result.allowDefaultProject, ['src/standalone.ts'], 'allowDefaultProject must match configured array');

  // Assertion 2: service opens TypeScript source file associating it with tsconfig.json
  const targetFile = path.join(rootDir, 'src', 'index.ts');
  const openResult = result.service.openClientFile(targetFile);
  assert(openResult !== null && typeof openResult === 'object', 'openClientFile must return an object');
  assert(openResult.configFileName && openResult.configFileName.endsWith('tsconfig.json'), 'configFileName must resolve to tsconfig.json');
  assert(Array.isArray(openResult.configFileErrors) && openResult.configFileErrors.length === 0, 'configFileErrors must be empty');

  // Assertion 3: service retrieves open ScriptInfo confirming file is tracked
  const scriptInfo = result.service.getScriptInfo(targetFile);
  assert(scriptInfo !== null && typeof scriptInfo === 'object', 'ScriptInfo must not be null');
  assert.strictEqual(scriptInfo.fileName, targetFile, 'ScriptInfo fileName must match target file');
  assert.strictEqual(scriptInfo.isScriptOpen(), true, 'ScriptInfo must report script is open');

  // Assertion 4: service opens standalone file permitted by allowDefaultProject
  const standaloneFile = path.join(rootDir, 'src', 'standalone.ts');
  const standaloneResult = result.service.openClientFile(standaloneFile);
  assert(standaloneResult !== null && typeof standaloneResult === 'object', 'openClientFile for standalone file must return an object');
  const standaloneScriptInfo = result.service.getScriptInfo(standaloneFile);
  assert(standaloneScriptInfo !== null && typeof standaloneScriptInfo === 'object', 'ScriptInfo for standalone file must not be null');
  assert.strictEqual(standaloneScriptInfo.fileName, standaloneFile, 'ScriptInfo fileName must match standalone file');

  console.log('Contract assertions passed successfully.');
}

runContract();

{
  "compilerOptions": {
    "target": "ES2022",
    "module": "commonjs",
    "moduleResolution": "node",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  },
  "include": [
    "src/**/*"
  ]
}