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# Resolve Parent Path [![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] > Resolve a path by walking parent directories.
## Installation ```bash npm install @stdlib/fs-resolve-parent-path ```
## Usage ```javascript var resolveParentPath = require( '@stdlib/fs-resolve-parent-path' ); ``` #### resolveParentPath( path\[, options], clbk ) Asynchronously resolves a path by walking parent directories. ```javascript resolveParentPath( 'package.json', onPath ); function onPath( error, path ) { if ( error ) { throw error; } console.log( path ); // => '...' } ``` The function accepts the following `options`: - **dir**: base directory from which to begin walking. May be either an absolute path or a path relative to the current working directory. By default, the function begins walking from the current working directory. To specify an alternative directory, set the `dir` option. ```javascript var opts = { 'dir': __dirname }; resolveParentPath( 'package.json', opts, onPath ); function onPath( error, path ) { if ( error ) { throw error; } console.log( path ); // => '...' } ``` #### resolveParentPath.sync( path\[, options] ) Synchronously resolves a path by walking parent directories. ```javascript var path = resolveParentPath.sync( 'package.json' ); // returns '...' ``` The function accepts the same `options` as [`resolveParentPath()`](#resolve-parent-path).
## Notes - If unable to resolve a path, both functions return `null`. - This implementation is **not** similar in functionality to core [`path.resolve`][node-core-path-resolve]. The latter performs string manipulation to generate a full path. This implementation walks parent directories to perform a **search**, thereby touching the file system. Accordingly, this implementation resolves a _real_ absolute file path and is intended for use when a target's location in a parent directory is unknown relative to a child directory; e.g., when wanting to find a package root from deep within a package directory.
## Examples ```javascript var resolveParentPath = require( '@stdlib/fs-resolve-parent-path' ); var opts = { 'dir': __dirname }; /* Sync */ var out = resolveParentPath.sync( 'package.json', opts ); // returns '...' out = resolveParentPath.sync( 'non_existent_basename' ); // returns null /* Async */ resolveParentPath( 'package.json', opts, onPath ); resolveParentPath( './../non_existent_path', onPath ); function onPath( error, path ) { if ( error ) { throw error; } console.log( path ); } ```
## See Also - [`@stdlib/fs-resolve-parent-path-cli`][@stdlib/fs-resolve-parent-path-cli]: CLI package for use as a command-line utility. - [`@stdlib/fs-resolve-parent-path-by`][@stdlib/fs/resolve-parent-path-by]: resolve a path according to a predicate function by walking parent directories.
* * * ## 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].
[@stdlib/fs-resolve-parent-path-cli]: https://www.npmjs.com/package/@stdlib/fs-resolve-parent-path-cli [npm-image]: http://img.shields.io/npm/v/@stdlib/fs-resolve-parent-path.svg [npm-url]: https://npmjs.org/package/@stdlib/fs-resolve-parent-path [test-image]: https://github.com/stdlib-js/fs-resolve-parent-path/actions/workflows/test.yml/badge.svg?branch=v0.2.2 [test-url]: https://github.com/stdlib-js/fs-resolve-parent-path/actions/workflows/test.yml?query=branch:v0.2.2 [coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/fs-resolve-parent-path/main.svg [coverage-url]: https://codecov.io/github/stdlib-js/fs-resolve-parent-path?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 [cli-section]: https://github.com/stdlib-js/fs-resolve-parent-path#cli [cli-url]: https://github.com/stdlib-js/fs-resolve-parent-path/tree/cli [@stdlib/fs-resolve-parent-path]: https://github.com/stdlib-js/fs-resolve-parent-path/tree/main [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/fs-resolve-parent-path/tree/deno [deno-readme]: https://github.com/stdlib-js/fs-resolve-parent-path/blob/deno/README.md [umd-url]: https://github.com/stdlib-js/fs-resolve-parent-path/tree/umd [umd-readme]: https://github.com/stdlib-js/fs-resolve-parent-path/blob/umd/README.md [esm-url]: https://github.com/stdlib-js/fs-resolve-parent-path/tree/esm [esm-readme]: https://github.com/stdlib-js/fs-resolve-parent-path/blob/esm/README.md [branches-url]: https://github.com/stdlib-js/fs-resolve-parent-path/blob/main/branches.md [stdlib-license]: https://raw.githubusercontent.com/stdlib-js/fs-resolve-parent-path/main/LICENSE [node-core-path-resolve]: https://nodejs.org/api/path.html#path_path_resolve_paths [@stdlib/fs/resolve-parent-path-by]: https://www.npmjs.com/package/@stdlib/fs-resolve-parent-path-by