next/dist/esm/shared/lib/router/utils/remove-path-prefix.js

The React Framework

import { pathHasPrefix } from './path-has-prefix';
/**
 * Given a path and a prefix it will remove the prefix when it exists in the
 * given path. It ensures it matches exactly without containing extra chars
 * and if the prefix is not there it will be noop.
 *
 * @param path The path to remove the prefix from.
 * @param prefix The prefix to be removed.
 */ export function removePathPrefix(path, prefix) {
    // If the path doesn't start with the prefix we can return it as is. This
    // protects us from situations where the prefix is a substring of the path
    // prefix such as:
    //
    // For prefix: /blog
    //
    //   /blog -> true
    //   /blog/ -> true
    //   /blog/1 -> true
    //   /blogging -> false
    //   /blogging/ -> false
    //   /blogging/1 -> false
    if (!pathHasPrefix(path, prefix)) {
        return path;
    }
    // Remove the prefix from the path via slicing.
    const withoutPrefix = path.slice(prefix.length);
    // If the path without the prefix starts with a `/` we can return it as is.
    if (withoutPrefix.startsWith('/')) {
        return withoutPrefix;
    }
    // If the path without the prefix doesn't start with a `/` we need to add it
    // back to the path to make sure it's a valid path.
    return "/" + withoutPrefix;
}

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