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https://github.com/stdlib-js/utils-try-require

Wrap `require` in a try/catch block.
https://github.com/stdlib-js/utils-try-require

catch error javascript node node-js nodejs require resolve safe stdlib trap try util utilities utility utils wrap

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Wrap `require` in a try/catch block.

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README 

        



  

    About stdlib...

  

  
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# tryRequire



[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] 



> Wrap `require` in a try/catch block.



## Installation



```bash

npm install @stdlib/utils-try-require

```



Alternatively,



-   To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).

-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).

-   For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).



The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.



To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.



## Usage



```javascript

var tryRequire = require( '@stdlib/utils-try-require' );

```



#### tryRequire( id )



Wraps `require` in a `try/catch` block. If able to resolve a module `id`, the function returns the value bound to `module.exports` in the resolved module. Otherwise, the function returns an `Error`.



```javascript

var x = tryRequire( 'beep' );



if ( x instanceof Error ) {

    console.log( x.message );

}

```



## Notes



-   Use caution when attempting to resolve a relative path or a local module. This function attempts to resolve a module from its current path. Thus, the function is **unable** to resolve anything which is not along its search path. For local requires, use an absolute file path.



    ```javascript

    var resolve = require( 'path' ).resolve;



    var out = tryRequire( resolve( '/foo/bar/baz', '..', 'lib', 'beep.js' ) );



    if ( out instanceof Error ) {

        console.error( out.message );

    }

    ```



## Examples



```javascript

var tryRequire = require( '@stdlib/utils-try-require' );



var out = tryRequire( '_abcdefghijklmnopqrstuvwxyz123456789_' );

if ( out instanceof Error ) {

    console.error( out.message );

} else {

    throw new Error( 'expected an error' );

}



out = tryRequire( '@stdlib/utils-try-require' );

if ( out !== tryRequire ) {

    throw new Error( 'expected export' );

}

```



* * *



## Notice



This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.



For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].



#### Community



[![Chat][chat-image]][chat-url]



---



## License



See [LICENSE][stdlib-license].



## Copyright



Copyright © 2016-2024. The Stdlib [Authors][stdlib-authors].



[npm-image]: http://img.shields.io/npm/v/@stdlib/utils-try-require.svg

[npm-url]: https://npmjs.org/package/@stdlib/utils-try-require



[test-image]: https://github.com/stdlib-js/utils-try-require/actions/workflows/test.yml/badge.svg?branch=main

[test-url]: https://github.com/stdlib-js/utils-try-require/actions/workflows/test.yml?query=branch:main



[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-try-require/main.svg

[coverage-url]: https://codecov.io/github/stdlib-js/utils-try-require?branch=main



[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg

[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im



[stdlib]: https://github.com/stdlib-js/stdlib



[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors



[umd]: https://github.com/umdjs/umd

[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules



[deno-url]: https://github.com/stdlib-js/utils-try-require/tree/deno

[deno-readme]: https://github.com/stdlib-js/utils-try-require/blob/deno/README.md

[umd-url]: https://github.com/stdlib-js/utils-try-require/tree/umd

[umd-readme]: https://github.com/stdlib-js/utils-try-require/blob/umd/README.md

[esm-url]: https://github.com/stdlib-js/utils-try-require/tree/esm

[esm-readme]: https://github.com/stdlib-js/utils-try-require/blob/esm/README.md

[branches-url]: https://github.com/stdlib-js/utils-try-require/blob/main/branches.md



[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-try-require/main/LICENSE