Add typings for settings module.

types/settings/index.d.ts

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+// Type definitions for settings 0.1
+// Project: https://github.com/mgutz/node-settings
+// Definitions by: Shrey Jain <https://github.com/shreyjain1994>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+// This wierd looking class definition is necessary since the function that the module
+// exposes NEEDS (will throw error otherwise) to be called with the `new` keyword
+// BUT returns a random object...not an instance of the class
+declare class Settings {
+    constructor(pathOrModule: Settings.PathOrModule, options?: Settings.Options);
+
+    [setting: string]: any;
+}
+
+declare namespace Settings {
+    interface Options {
+        env?: string;
+        root?: string;
+        defaults?: any;
+    }
+
+    type PathOrModule = string |
+        {
+            forceEnv?: string,
+            common: any, // error is thrown if 'common' object is not provided
+            [envName: string]: any
+        };
+}
+export = Settings;

types/settings/settings-tests.ts

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+import Settings = require('settings');
+
+// works without options
+new Settings('foo');
+
+// works with path to module containing settings
+const settings = new Settings('./path/to/my/config');
+// any prop is accessible on returned value
+settings.hello = 'world';
+const foo = settings.bar;
+
+// works with settings object
+const settings2 = new Settings({
+    common: {setting: 'mySetting'}, production: {
+        hello: 'bar'
+    }
+});
+settings2.hello = 'world';
+
+// allows for forceEnv in settings object
+const settings3 = new Settings({
+    common: {},
+    forceEnv: 'production'
+});
+
+// allows options
+const settings4 = new Settings('./path/to/my/settings', {
+    root: 'someRoot',
+    env: 'development',
+    defaults: {
+        someSetting: 'settingValue'
+    }
+});

types/settings/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",
+    "settings-tests.ts"
+  ]
+}

types/settings/tslint.json

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