{"id":11086,"library":"inline-worker","title":"Inline Web Worker Utility","description":"inline-worker is a JavaScript utility designed to create a universal Web Worker instance directly from a function. It abstracts away the boilerplate of setting up separate worker files, allowing developers to define worker logic inline within their main script. The package intelligently determines whether to instantiate a native `Worker` in browser environments or a custom `InlineWorker` implementation for Node.js, providing a consistent API across different JavaScript runtimes. The current stable version is 1.1.0, and the package has not seen updates in over eight years (as of April 2026), indicating a low release cadence. Its key differentiator is the inline definition and universal runtime support, making it convenient for small, self-contained worker tasks without the need for separate files or complex build steps. However, its age suggests potential compatibility issues with modern JavaScript features, module systems, and a lack of ongoing maintenance.","status":"abandoned","version":"1.1.0","language":"javascript","source_language":"en","source_url":"https://github.com/mohayonao/inline-worker","tags":["javascript","worker"],"install":[{"cmd":"npm install inline-worker","lang":"bash","label":"npm"},{"cmd":"yarn add inline-worker","lang":"bash","label":"yarn"},{"cmd":"pnpm add inline-worker","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"This package is primarily designed for CommonJS environments. Direct ES module `import` syntax will likely fail in modern Node.js or browser environments without a transpiler or bundler configured to handle CommonJS interop.","wrong":"import { InlineWorker } from 'inline-worker';","symbol":"InlineWorker","correct":"const InlineWorker = require('inline-worker');"},{"note":"While the `sharedSelfObject` parameter is optional, passing it allows for testing worker internal functions from the main thread, as demonstrated in the package's examples.","wrong":"new InlineWorker(workerFunction);","symbol":"InlineWorker (constructor)","correct":"new InlineWorker(workerFunction, sharedSelfObject);"}],"quickstart":{"code":"const InlineWorker = require('inline-worker');\n\nlet self = {};\nlet worker = new InlineWorker(function(self) {\n  // Define worker's message handler\n  self.onmessage = function(e) {\n    postMessage(self.bark(e.data)); // Calls a worker internal function and posts result back\n  };\n\n  // Define a worker internal function (accessible via the shared 'self' object)\n  self.bark = function(msg) {\n    return msg + '!!';\n  };\n}, self); // Pass 'self' object for shared access\n\n// Main thread's message handler for worker responses\nworker.onmessage = function(e) {\n  console.log(e.data + '!!'); // Expected: 'hello!!!!'\n};\n\n// Send a message to the worker\nworker.postMessage('hello'); // Initiates the worker process\n\n// You can test worker internal functions directly via the shared 'self' object\nconsole.log(self.bark('bye')); // Expected: 'bye!!'","lang":"javascript","description":"This quickstart demonstrates how to create an `InlineWorker` from a function, pass a shared `self` object for internal worker function testing, send messages to the worker, and receive responses."},"warnings":[{"fix":"For Node.js, use `const InlineWorker = require('inline-worker');`. In browser environments or ESM projects, ensure your bundler (e.g., Webpack, Rollup, Parcel) is configured to correctly handle CommonJS modules, or consider using a modern alternative that supports ESM natively.","message":"The `inline-worker` package is primarily CommonJS-based. Attempting to use ES module `import` syntax directly in modern Node.js or browser environments without a compatible bundler or transpilation setup will likely result in module resolution errors or runtime failures.","severity":"breaking","affected_versions":">=1.0.0"},{"fix":"For new projects, consider using a more actively maintained Web Worker library, or implement native Web Workers directly. For existing projects, thoroughly vet its compatibility with your current stack and consider forking the repository if critical maintenance is required.","message":"This package is effectively abandoned, with its last publish eight years ago (as of April 2026). This means there will be no further updates, bug fixes, or security patches, which could lead to compatibility issues with newer JavaScript runtimes or potential security vulnerabilities in critical applications.","severity":"gotcha","affected_versions":">=1.0.0"},{"fix":"Create a `declarations.d.ts` file with `declare module 'inline-worker';` or provide more specific types if you understand the internal API, e.g., `declare module 'inline-worker' { class InlineWorker extends Worker { constructor(func: Function, self?: object); } export = InlineWorker; }`","message":"The `inline-worker` package does not ship with TypeScript definition files (`.d.ts`). This means TypeScript users will either need to provide their own type declarations or use `any` types, reducing type safety.","severity":"gotcha","affected_versions":">=1.0.0"},{"fix":"If shared state is not intended, avoid passing the `self` object or ensure that the worker logic does not mutate it in ways that would affect the main thread. If shared access is desired, clearly document the interaction points to prevent unintended side effects.","message":"The second `self` parameter in the `InlineWorker` constructor is a shared object. While useful for testing worker internal functions from the main thread, modifications to this object within the worker function are directly visible in the main thread. This shared state can lead to unexpected side effects if not carefully managed or understood.","severity":"gotcha","affected_versions":">=1.0.0"}],"env_vars":null,"last_verified":"2026-04-19T00:00:00.000Z","next_check":"2026-07-18T00:00:00.000Z","problems":[{"fix":"Ensure you are using the CommonJS `require` syntax: `const InlineWorker = require('inline-worker');`.","cause":"Attempting to instantiate `InlineWorker` using ES module `import` syntax (`import { InlineWorker } from 'inline-worker';`) in a CommonJS-only environment (e.g., older Node.js versions, or without a bundler configured for CJS interop).","error":"TypeError: InlineWorker is not a constructor"},{"fix":"Within the worker function, `postMessage` should be called directly, as it's a global function within the Web Worker scope. If you passed a `self` object to the constructor, ensure you're not inadvertently using a property on that `self` object named `postMessage` that shadows the global one. You can also explicitly use `self.postMessage()` where `self` refers to the worker's global scope.","cause":"This error occurs within the worker function if `postMessage` is called incorrectly or if the `self` context passed to the worker function is overriding the global `postMessage` function.","error":"ReferenceError: postMessage is not defined"},{"fix":"Ensure the first argument to `new InlineWorker()` is a properly defined JavaScript function that encapsulates your worker's logic, as shown in the package examples.","cause":"The first argument provided to the `InlineWorker` constructor is not a valid JavaScript function.","error":"Error: A worker script must be a function or a URL."}],"ecosystem":"npm"}