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node_modules/global-prefix/index.js

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+/*!
+ * global-prefix <https://github.com/jonschlinkert/global-prefix>
+ *
+ * Copyright (c) 2015-present Jon Schlinkert.
+ * Licensed under the MIT license.
+ */
+
+'use strict';
+
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const ini = require('ini');
+let prefix;
+
+const getPrefix = () => {
+  if (process.env.PREFIX) return process.env.PREFIX;
+  if (prefix) return prefix;
+
+  // Start by checking if the global prefix is set by the user
+  let home = os.homedir();
+
+  // os.homedir() returns undefined if $HOME is not set; path.resolve requires strings
+  if (home) {
+    prefix = tryConfigPath(path.resolve(home, '.npmrc'));
+  }
+
+  if (prefix) {
+    return prefix;
+  }
+
+  // Otherwise find the path of npm
+  let npm = tryNpmPath();
+  if (npm) {
+    // Check the built-in npm config file
+    prefix = tryConfigPath(path.resolve(npm, '..', '..', 'npmrc'));
+
+    if (prefix) {
+      // Now the global npm config can also be checked.
+      prefix = tryConfigPath(path.resolve(prefix, 'etc', 'npmrc')) || prefix;
+    }
+  }
+
+  if (!prefix) {
+    let { APPDATA, DESTDIR, OSTYPE } = process.env;
+
+    // c:\node\node.exe --> prefix=c:\node\
+    if (process.platform === 'win32' || OSTYPE === 'msys' || OSTYPE === 'cygwin') {
+      prefix = APPDATA ? path.join(APPDATA, 'npm') : path.dirname(process.execPath);
+      return prefix;
+    }
+
+    // /usr/local/bin/node --> prefix=/usr/local
+    prefix = path.dirname(path.dirname(process.execPath));
+
+    // destdir only is respected on Unix
+    if (DESTDIR) {
+      prefix = path.join(DESTDIR, prefix);
+    }
+  }
+
+  return prefix;
+}
+
+function tryNpmPath() {
+  try {
+    return fs.realpathSync(require('which').sync('npm'));
+  } catch (err) { /* do nothing */ }
+}
+
+function tryConfigPath(configPath) {
+  try {
+    return ini.parse(fs.readFileSync(configPath, 'utf-8')).prefix;
+  } catch (err) { /* do nothing */ }
+}
+
+/**
+ * Expose `prefix`
+ */
+
+Reflect.defineProperty(module, 'exports', {
+  get() {
+    return getPrefix();
+  }
+});