This code snippet ensures the underscore and underscore.string libraries are installed in a Node.js project by checking for their presence and installing them using npm if needed.

Run example

npm run import -- "install autorewire"

install autorewire

/*
// TODO: write a parser for this that also works on web tutorials for self-validation
package.json
"dependencies": {
    "underscore": "^1.8.3",
    "underscore.string": "^3.2.2"
}
*/

var execSync = require('child_process').execSync;
try {
    require.resolve('underscore');
    require.resolve('underscore.string');
} catch (e) {
    execSync('npm install underscore underscore.string');
}

/**
 * Installs required dependencies, underscore and underscore.string.
 * 
 * @returns {Promise}
 */
async function installDependencies() {
    try {
        const underscore = require('underscore');
        const underscoreString = require('underscore.string');
        console.log('Dependencies already installed.');
    } catch (error) {
        console.error('Dependencies not found. Installing...');
        const { spawn } = require('child_process');
        const npmInstall = spawn('npm', ['install', 'underscore', 'underscore.string']);
        await new Promise((resolve, reject) => {
            npmInstall.on('close', resolve);
            npmInstall.on('error', reject);
        });
        console.log('Dependencies installed.');
    }
}

installDependencies();

This code snippet is designed to ensure that the underscore and underscore.string libraries are installed in the project.

Here's a breakdown:

1. TODO Comment:

   • The comment // TODO: write a parser for this that also works on web tutorials for self-validation suggests that the code is part of a larger project that aims to analyze and validate code snippets, potentially including those found in web tutorials.

2. Dependencies:

   • The code snippet assumes that the project uses a package manager like npm. It references a package.json file, which typically lists project dependencies.
   • The dependencies section in package.json specifies that the project requires versions 1.8.3 or higher of underscore and 3.2.2 or higher of underscore.string.

3. Dependency Check and Installation:

   • The code uses require.resolve() to check if the underscore and underscore.string modules are available in the project's node_modules directory.
   • If either module is not found, it executes execSync('npm install underscore underscore.string') to install them using npm.

In summary: This code snippet is a simple dependency management script that ensures the necessary underscore and underscore.string libraries are installed in the project.