tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "es2023",                                  /* The action runs on the runner's Node 24, so nothing needs downlevelling. */
    "lib": ["es2023"],
    "types": ["node"],

    /* Modules — esbuild produces the CommonJS bundle the runner loads, so tsc only needs
       to resolve the same way a bundler does (which includes reading `exports` maps:
       @actions/core 3.x publishes ESM only and is invisible to the classic resolver). */
    "module": "preserve",
    "moduleResolution": "bundler",
    "resolveJsonModule": true,
    "verbatimModuleSyntax": false,

    /* Emit — nothing. `yarn build` bundles, `yarn typecheck` only checks. */
    "noEmit": true,
    "esModuleInterop": true,                             /* Ease importing CommonJS modules such as axios. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */

    /* Type Checking */
    "strict": true,                                      /* Enable all strict type-checking options. */
    "skipLibCheck": true
  },
  "include": ["src/**/*.ts", "vitest.config.mts"],
  "exclude": ["node_modules", "dist"]
}