install-module-linked/dist/esm/lib/cache.js

Installs and symlinks a module into node_modules

import fs from 'fs';
import mkdirp from 'mkdirp-classic';
import path from 'path';
import Queue from 'queue-cb';
import rimraf2 from 'rimraf2';
import tempSuffix from 'temp-suffix';
import getSpecifier from './getSpecifier.js';
import install from './install.cjs';
import parse from './parseInstallString.js';
export default function ensureCached(installString, cachePath, callback) {
    getSpecifier(installString, (_err, specifier)=>{
        const cachedAt = path.join(cachePath, specifier);
        const { name } = parse(installString);
        fs.stat(cachedAt, (err)=>{
            if (!err) return callback(null, cachedAt); // already cached
            const tmp = `${cachedAt}-${tempSuffix()}`;
            const tmpModulePath = path.join(tmp, 'node_modules', ...name.split('/'));
            const queue = new Queue(1);
            queue.defer(mkdirp.bind(null, tmp));
            queue.defer(fs.writeFile.bind(null, path.join(tmp, 'package.json'), '{}', 'utf8'));
            queue.defer(install.bind(null, specifier, tmp));
            queue.defer((cb)=>fs.rename(tmpModulePath, cachedAt, cb.bind(null, null)));
            queue.defer((cb)=>fs.rename(path.join(tmp, 'node_modules'), path.join(cachedAt, 'node_modules'), cb.bind(null, null)));
            queue.await((err)=>{
                // clear up whether installed or not
                rimraf2(tmp, {
                    disableGlob: true
                }, ()=>err ? callback(err) : callback(null, cachedAt));
            });
        });
    });
}