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index.js
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index.js
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"use strict";
const fs = require("fs");
const join = require("path").join;
const os = require("os");
const rc = require("rc");
const resolve = require("path").resolve;
const validate = require("validate-npm-package-name");
module.exports = function requireglobal(request) {
if (!isValidRequest(request)) throw new Error("Invalid request: " + request);
try { return require(join(yarnGlobalFolder(), request)); } catch (err) {}
try { return require(join(npmGlobalFolder(), request)); } catch (err) {}
throw new Error("Cannot find module: '" + request + "'");
};
module.exports.resolve = function resolve(request) {
if (!isValidRequest(request)) throw new Error("Invalid request: " + request);
var modulePath;
modulePath = join(yarnGlobalFolder(), request);
if (isReadableFolder(modulePath)) return modulePath;
modulePath = join(npmGlobalFolder(), request);
if (isReadableFolder(modulePath)) return modulePath;
throw new Error("Cannot find module: '" + request + "'");
};
// for yarn we replicate the checks from
// https://github.com/yarnpkg/yarn/blob/master/src/constants.js
function yarnGlobalFolder() {
var userHome = os.homedir();
if (process.platform === "linux" && process.env.USER === "root") {
userHome = resolve("/usr/local/share");
}
if (process.platform === "win32" && process.env.LOCALAPPDATA) {
return join(process.env.LOCALAPPDATA, "Yarn", "global", "node_modules");
}
return join(userHome, ".yarn-config", "global", "node_modules");
}
// for npm, we extract the global folder from its config files
function npmGlobalFolder() {
var prefix = rc("npm").prefix;
if (process.platform === "win32") {
prefix = prefix || join(process.env.APPDATA, "npm");
}
return join(prefix, "lib", "node_modules");
}
function isReadableFolder(path) {
try {
fs.accessSync(path, fs.constants.R_OK);
} catch (err) { return false; }
try {
if (fs.statSync(path).isDirectory()) {
return true;
}
} catch (err) { return false; }
return false;
}
function isValidRequest(request) {
const result = validate(request);
return result.validForNewPackages || result.validForOldPackages;
}