[osenv] Add typing for osenv (#35230)

* Added typedefs for osenv

* Arrow funs

types/osenv/index.d.ts

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+// Type definitions for osenv 0.1
+// Project: https://github.com/npm/osenv
+// Definitions by:  Adam Zerella <https://github.com/adamzerella>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * The machine name. Calls hostname if not found.
+ */
+export function hostname(cb?: (hostname: string, error?: string) => void): string;
+
+/**
+ * The currently logged-in user. Calls whoami if not found.
+ */
+export function user(cb?: (user: string, error?: string) => void): string;
+
+/**
+ * Either PS1 on unix, or PROMPT on Windows.
+ */
+export function prompt(cb?: (prompt: string, error?: string) => void): string;
+
+/**
+ * The place where temporary files should be created.
+ */
+export function tmpdir(cb?: (tmpdir: string, error?: string) => void): string;
+
+/**
+ * No place like it.
+ */
+export function home(cb?: (home: string, error?: string) => void): string;
+
+/**
+ * An array of the places that the operating system will search for executables.
+ */
+export function path(cb?: (path: string, error?: string) => void): string;
+
+/**
+ * Return the executable name of the editor program.
+ * This uses the EDITOR and VISUAL environment variables,
+ * and falls back to vi on Unix, or notepad.exe on Windows.
+ */
+export function editor(cb?: (editor: string, error?: string) => void): string;
+
+/**
+ * The SHELL on Unix, which Windows calls the ComSpec.
+ * Defaults to 'bash' or 'cmd'.
+ */
+export function shell(cb?: (shell: string, error?: string) => void): string;

types/osenv/osenv-tests.ts

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+import osenv = require("osenv");
+
+osenv.hostname();
+osenv.hostname((er, hostname) => {});
+
+osenv.home();
+osenv.home((er, home) => {});
+
+osenv.editor();
+osenv.editor((er, editor) => {});
+
+osenv.path();
+osenv.path((er, path) => {});
+
+osenv.prompt();
+osenv.prompt((er, prompt) => {});
+
+osenv.shell();
+osenv.shell((er, shell) => {});
+
+osenv.tmpdir();
+osenv.tmpdir((er, tmpdir) => {});
+
+osenv.user();
+osenv.user((er, user) => {});

types/osenv/tsconfig.json

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+{
+    "compilerOptions": {
+      "module": "commonjs",
+      "lib": [
+        "es6"
+      ],
+      "noImplicitAny": true,
+      "noImplicitThis": true,
+      "strictNullChecks": true,
+      "strictFunctionTypes": true,
+      "baseUrl": "../",
+      "typeRoots": [
+        "../"
+      ],
+      "types": [
+
+      ],
+      "noEmit": true,
+      "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+      "index.d.ts",
+      "osenv-tests.ts"
+    ]
+}

types/osenv/tslint.json

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+{
+    "extends": "dtslint/dt.json"
+}