{"id":11502,"library":"option","title":"Option Type for JavaScript","description":"This package provides a robust implementation of the option (or maybe) type for JavaScript, designed to manage optional values and mitigate the pervasive issues of `null` and `undefined`. It offers a functional approach to handling the presence or absence of a value through `some(value)` and `none` constructs, similar to types found in languages like Rust or Scala. The current stable version is `0.2.4`, which was published approximately nine years ago, indicating that the package is no longer actively maintained. Key differentiators include its rich API for value manipulation, such as `map`, `flatMap`, `filter`, `orElse`, and `valueOrElse`, which promote safer and more expressive code compared to traditional null checks. Its `fromNullable` function also provides a convenient way to convert potentially nullish values into `option` types.","status":"abandoned","version":"0.2.4","language":"javascript","source_language":"en","source_url":"https://github.com/mwilliamson/node-options","tags":["javascript","option","maybe"],"install":[{"cmd":"npm install option","lang":"bash","label":"npm"},{"cmd":"yarn add option","lang":"bash","label":"yarn"},{"cmd":"pnpm add option","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"The package is CommonJS-only. There is no official ESM support.","wrong":"import option from 'option';","symbol":"option","correct":"const option = require('option');"},{"note":"Some is a property of the default export, not a named export. Requires CommonJS.","wrong":"import { some } from 'option';","symbol":"option.some","correct":"const someValue = option.some('hello');"},{"note":"None is a property of the default export, not a named export. Requires CommonJS.","wrong":"import { none } from 'option';","symbol":"option.none","correct":"const noValue = option.none;"},{"note":"A utility function to convert null or undefined to option.none.","symbol":"option.fromNullable","correct":"const maybeValue = option.fromNullable(someNullableVar);"}],"quickstart":{"code":"const option = require(\"option\");\n\n// Creating Option instances\nconst someUser = option.some({\n    id: 1,\n    name: () => \"Alice\"\n});\nconst noUser = option.none;\n\n// Basic checks\nconsole.log(`someUser isSome: ${someUser.isSome()}`); // true\nconsole.log(`noUser isNone: ${noUser.isNone()}`);     // true\n\n// Retrieving values safely\nfunction greet(userOption) {\n    return userOption.map(user => user.name())\n                     .valueOrElse(\"Anonymous\");\n}\n\nconsole.log(`Greeting someUser: Hello ${greet(someUser)}`); // Hello Alice\nconsole.log(`Greeting noUser: Hello ${greet(noUser)}`);     // Hello Anonymous\n\n// Using fromNullable\nconst nullableString = Math.random() > 0.5 ? \"A string\" : null;\nconst safeOption = option.fromNullable(nullableString);\nconsole.log(`From nullable: ${safeOption.valueOrElse(\"No string provided\")}`);","lang":"javascript","description":"Demonstrates creating 'some' and 'none' options, performing checks, safely unwrapping values with `valueOrElse`, and using `fromNullable`."},"warnings":[{"fix":"Consider migrating to a more actively maintained option/maybe type library in the JavaScript ecosystem, such as 'fp-ts', 'neverthrow', or similar alternatives that provide better modern JavaScript/TypeScript support and community backing.","message":"The `option` package (mwilliamson/node-options) has not been updated in approximately nine years (last published version 0.2.4). It is considered abandoned and may have unaddressed bugs or security vulnerabilities.","severity":"abandoned","affected_versions":"<=0.2.4"},{"fix":"Always use safer methods like `.valueOrElse(defaultValue)`, `.map()`, `.flatMap()`, or `.orElse()` to handle the absence of a value. Wrap direct `.value()` calls in `try...catch` blocks if absolutely necessary, but prefer functional approaches.","message":"Attempting to call `.value()` directly on an `option.none` instance will throw a runtime error. This design choice forces explicit handling of the 'none' case, but can lead to unhandled exceptions if not properly anticipated.","severity":"gotcha","affected_versions":">=0.1.0"},{"fix":"For TypeScript projects, you may need to create a `d.ts` declaration file (e.g., `declare module 'option';`). For ESM, it can be imported using `import * as option from 'option';` in Node.js, but native ESM support is not guaranteed.","message":"This package is written in CommonJS and does not provide native TypeScript typings or explicit ESM (ECMAScript Modules) support. Integrating it into modern TypeScript or ESM-first projects may require manual type declarations or CJS interoperability layers.","severity":"gotcha","affected_versions":">=0.1.0"}],"env_vars":null,"last_verified":"2026-04-19T00:00:00.000Z","next_check":"2026-07-18T00:00:00.000Z","problems":[{"fix":"Refactor code to use safe unwrapping methods like `option.valueOrElse(defaultValue)` or `option.map(func).valueOrElse(defaultValue)` instead of direct `.value()` calls on potentially empty options.","cause":"Attempting to access `.value()` on an `option.none` instance after it was converted implicitly or explicitly from `null` or `undefined`.","error":"TypeError: Cannot read properties of null (reading 'value') OR TypeError: Cannot read property 'value' of undefined"},{"fix":"Use methods that handle the 'none' case gracefully, such as `.map()`, `.flatMap()`, or `.valueOrElse(defaultValue)` to provide a fallback value or transform the option without directly unwrapping it when it might be empty.","cause":"Directly calling `.value()` on an `option.none` instance, which is explicitly designed to throw an error in this scenario.","error":"Error: value of none()"}],"ecosystem":"npm"}