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Teahan"},"license":"MIT","keywords":["try","catch","helper","error","handling","utility","asleepace","isomorphic","ergonomic","vet","unwrap","result","exceptions"],"description":"TypeScript utilities for exception handling and errors-as-values.","maintainers":[{"name":"asleepace","email":"colin_teahan@yahoo.com"}],"readme":"# Try\n\n![try-catch-cover](https://github.com/user-attachments/assets/043b452a-56c5-4697-aa79-c5a059c5f6c6)\n\nType-safe error handling primitives for modern JavaScript & TypeScript projects.\n\n## Installation\n\nUsing npm:\n\n```bash\nnpm install @asleepace/try\n```\n\nUsing Yarn:\n\n```bash\nyarn add @asleepace/try\n```\n\nUsing Bun:\n\n```bash\nbun add @asleepace/try\n```\n\n## Quick Start\n\nThe goal of this package is to provide concise, type-safe and easy to use tools for handling exceptions.\n\n```ts\nimport { Try } from '@asleepace/try'\n\nconst [url, error] = Try.catch(() => new URL(userInput))\n\nif (error) return console.warn(error.message)\n\nconst [response, networkError] = await Try.catch(() => fetch(url))\nconst [jsonData, parsingError] = await Try.catch(() => response!.json())\n\nif (parsingError) return console.warn(parsingError.message)\n\nreturn jsonData.userName\n```\n\n## Result Type\n\nThe `Try.catch(fn)` utility returns a special result type `Res` which is a class that extends a result tuple. The `Res` class provides\nsome helpful utilities for handling results:\n\n```ts\nconst result = await Try.catch(() => response.json())\n\n// includes powerful type-guards\nif (result.isErr()) return console.warn(result.error.message)\n\n// and convenience methods\nconst json = result.unwrap()\n\n// supports array destructuring\nconst [user, error] = await Try.catch(async () => {\n const profileUrl = new URL(json.user!.profile)\n return fetch(profileUrl).then((res) => res.json())\n})\n\nif (!error) {\n console.log(`Hello, ${user.name}!`)\n} else {\n console.warn(error.message)\n}\n```\n\nThe can be used in conjunction with the array destructuring syntax, which can help if you are only interested in the value or error.\n\n```ts\nconst result = await Try.catch(() =>\n fetch('https://api.users.com/me')\n .then((res) => res.json())\n .then((usr) => usr as User)\n)\n\nconsole.log(result.value) // User | undefined\nconsole.log(result.error) // Error | undefined\n\n// automatically narrows the type for you!\n\nif (result.isOk()) {\n const user = result.value // User!\n} else {\n const fail = result.error // Error!\n}\n\n// in some cases you may just want the value or to throw again:\n\nconst user = result.unwrap() // User | never\n\n// or you may want the value or a fallback:\n\nconst user = result.unwrapOr(cachedUser) // User\n```\n\n## API\n\n```ts\nTry.catch(fn: () => Promise): Promise<[T, undefined] | [undefined, Error]>\n```\n\nExecutes a function and returns a tuple containing either:\n\n- `[value, undefined]` if the function executes successfully\n- `[undefined, error]` if the function throws an error\n\nWorks with both synchronous and asynchronous functions, automatically returning a Promise for async operations.\n\n## Shorthand\n\nThis package also exports a shorthand utility called **vet** which stands for _value / error tuple_ and provides a more concise way to interact with this api.\n\n```ts\n// Add more examples of the VET shorthand\nimport { vet } from '@asleepace/try'\n\n// Simple usage\nconst [value] = vet(() => JSON.parse(data))\n\n// Only get the error\nconst [, error] = vet(() => JSON.parse(data))\n\n// With TypeScript generics for better type inference\nconst [user] = vet(() => getUserFromAPI())\n```\n\n## Benefits\n\n- **No Try/Catch Blocks**: Clean, readable code without nested try/catch structures\n- **Type Safety**: Full TypeScript support with proper type inference\n- **Consistent Pattern**: Uniform error handling for both sync and async code\n- **Zero Dependencies**: Lightweight and dependency-free\n- **Isomorphic**: Works in both browser and Node.js environments\n- **Powerful Results**: Type safe, tested and versatile result class\n\n## Testing\n\nThis package includes a comprehensive test suite. To run the tests:\n\n```bash\n# Clone the repository\ngit clone https://github.com/asleepace/try.git\ncd try\n\n# Install dependencies\nbun install\n\n# Build project & generate types\nbun run build\n\n# Run tests\nbun test\n```\n\n## Examples\n\n### Making Network Requests\n\n```ts\n// handle synchronous operations which can throw with ease...\nconst encoded = Try.catch(() => JSON.stringify(userInput))\n\nif (!encoded.ok) return encoded.error\n\nconst [response, networkError] = await Try.catch(() =>\n fetch('https://api.com/create', {\n method: 'POST',\n body: encoded.value,\n })\n)\n\nif (networkError) return networkError\n\nconst [user, jsonError] = await Try.catch(response.json)\n\nif (jsonError) return jsonError\n\nreturn user\n```\n\n### Error Handling in a React Component\n\n```tsx\nimport React, { useEffect, useState } from 'react'\nimport { Try } from '@asleepace/try'\n\nfunction UserProfile({ userId }) {\n const [user, setUser] = useState(null)\n const [loading, setLoading] = useState(true)\n const [error, setError] = useState(null)\n\n useEffect(() => {\n async function loadUser() {\n setLoading(true)\n\n const [userData, fetchError] = await Try.catch(async () => {\n const response = await fetch(`/api/users/${userId}`)\n if (!response.ok) throw new Error(`HTTP error ${response.status}`)\n return response.json()\n })\n\n setUser(userData)\n setError(fetchError)\n setLoading(false)\n }\n\n loadUser()\n }, [userId])\n\n if (loading) return
Loading...
\n if (error) return
Error: {error.message}
\n\n return (\n
\n

{user.name}

\n

{user.email}

\n
\n )\n}\n```\n\n### Chaining Operations\n\n```ts\nimport { Try } from '@asleepace/try'\n\nasync function processData(rawData): object | undefined {\n // Step 1: Parse the data\n const [parsed, parseError] = Try.catch(() => JSON.parse(rawData))\n if (parseError) return console.warn(parseError.message)\n\n // Step 2: Transform the data\n const [transformed, transformError] = Try.catch(() => {\n return parsed.items.map((item) => ({\n id: item.id,\n name: item.name.toUpperCase(),\n value: item.value * 2,\n }))\n })\n if (transformError) return console.warn(transformError.message)\n\n // Step 3: Save the data\n const saveResult = await Try.catch(async () => {\n const response = await fetch('/api/save', {\n body: JSON.stringify(transformed),\n method: 'POST',\n })\n return response.json()\n })\n\n if (saveResult.isErr()) return console.warn(saveResult.error)\n return saveResult.unwrap()\n}\n```\n\n# Specification\n\n## Overview\n\nThe `Try.catch` utility provides a type-safe way to handle errors in both synchronous and asynchronous functions, returning a result tuple that contains either a value or an error, but never both.\n\n## Return Values\n\n- `Try.catch` always returns either a `ResultOk` or `ResultError` type, which extends the tuple types `[T, undefined]` or `[undefined, Error]` respectively.\n- The returned object is guaranteed to have exactly two elements, with either index 0 or index 1 being undefined.\n- If the function completes successfully, index 0 will contain the return value and index 1 will be undefined.\n- If the function throws an error, index 0 will be undefined and index 1 will contain the error.\n\n## Error Handling\n\n- If a non-Error value is thrown (such as a string, number, or object), it will be automatically converted to an instance of the built-in `Error` class.\n- Thrown values that aren't already errors will first be coerced to strings and then used to construct a new `Error` instance.\n- If the function returns an `Error` object as its value (not thrown), it will be treated as a successful result with the `Error` as the value at index 0, not as an error case.\n\n## Properties and Methods\n\nThe returned result object includes several convenience properties and methods:\n\n- `.value`: Returns the value at index 0 (the success value) or undefined if an error occurred.\n- `.error`: Returns the error at index 1 or undefined if the operation was successful.\n- `.ok`: A boolean property that is `true` when `.error === undefined` and `false` otherwise.\n- `.unwrap()`: Returns the value if present, or throws the captured error if no value is present.\n- `.unwrapOr(fallback)`: Returns the value if present, or the provided fallback value if no value is present.\n- `.toString()`: Returns a string representation of the result, displaying either the successful value or the error message.\n\n## Type Safety\n\n- The returned result type correctly narrows in type-guard contexts:\n - When checking `if (result.ok)`, TypeScript will narrow the type to `ResultOk`.\n - When checking `if (!result.ok)`, TypeScript will narrow the type to `ResultError`.\n- In `ResultOk` contexts, `result.value` is typed as `T` and `result.error` is typed as `undefined`.\n- In `ResultError` contexts, `result.value` is typed as `undefined` and `result.error` is typed as `Error`.\n\n## Async Support\n\n- `Try.catch` supports both synchronous and asynchronous functions.\n- When passed a function that returns a Promise, `Try.catch` returns a Promise that resolves to a result tuple.\n- Rejected promises are captured and converted to error results, following the same rules as thrown errors.\n\n## Instanceof Support\n\n- The returned result object is an instance of `TryResultClass`, enabling `instanceof` checks.\n- This allows for easier type checking and integration with existing code patterns.\n\n# Changelog\n\n## 0.2.1\n\n- add `Res.ok(value)` and `Res.err(error)` initializers\n- add `isOk()` and `isErr()` type guards to result\n- move all code into `src/index.ts`\n- remove junks files and reduce package size\n- remove internal `Try.#handler` method\n- simplify `Try.catch` logic\n- simplify types\n\n## 0.2.0\n\n- add `vet(fn)` shorthand\n- add convenience methods\n- Update `Result` class\n- Update test suite\n\n## 0.14.0\n\n- Update `README.md`\n- Update `Try.catch` functionality\n\n## 0.13.0\n\n- Initial release\n\n## License\n\nMIT\n","readmeFilename":"README.md"}