node-version-utils/dist/esm/spawnOptions.js

Utilities for running commands on a specific version of node by installed path

import pathKey from 'env-path-key';
import fs from 'fs';
import path from 'path';
import prepend from 'path-string-prepend';
import startsWithFn from './lib/startsWithFn.js';
const isWindows = process.platform === 'win32' || /^(msys|cygwin)$/.test(process.env.OSTYPE);
const NODE = isWindows ? 'node.exe' : 'node';
const startsNPM = startsWithFn('npm_');
const startsPath = startsWithFn('path');
export default function spawnOptions(installPath, options = {}) {
    // Resolve symlinks to get real path (fixes nvm-windows symlink issues where
    // C:\nvm4w\nodejs points to the active Node version via symlink)
    try {
        installPath = fs.realpathSync(installPath);
    } catch (_e) {
    // Keep original path if resolution fails
    }
    const PATH_KEY = pathKey();
    const processEnv = options.env || process.env;
    const bin = isWindows ? installPath : path.join(installPath, 'bin');
    const env = {};
    env.npm_node_execpath = path.join(bin, NODE);
    env.npm_config_prefix = installPath;
    // copy the environment not for npm and skip case-insesitive additional paths
    for(const key in processEnv){
        // skip npm_ variants and non-matching path
        if (key.length > 4 && startsNPM(key)) continue;
        if (key.length === 4 && startsPath(key) && key !== PATH_KEY) continue;
        env[key] = processEnv[key];
    }
    // override node
    if (env.NODE !== undefined) env.NODE = env.npm_node_execpath;
    if (env.NODE_EXE !== undefined) env.NODE_EXE = env.npm_node_execpath;
    // put the path to node and npm at the front
    if (options.env && !options.env[PATH_KEY]) {
        throw new Error(`node-version-utils: options.env missing required ${PATH_KEY}`);
    }
    const basePath = env[PATH_KEY] || process.env[PATH_KEY] || '';
    env[PATH_KEY] = prepend(basePath, bin);
    return {
        ...options,
        cwd: process.cwd(),
        env
    };
}