getopts: add library definitions.

types/getopts/getopts-tests.ts

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+import getopts = require('getopts');
+
+getopts([]); // $ExpectType ParsedOptions
+getopts(['one', 'two']); // $ExpectType ParsedOptions
+getopts(['one', 'two'], { alias: { h: 'help' } }); // $ExpectType ParsedOptions
+getopts(['one', 'two'], { alias: { verbose: ['v', '--v'] } }); // $ExpectType ParsedOptions
+getopts(['one', 'two'], { boolean: ['verbose'] }); // $ExpectType ParsedOptions
+getopts(['one', 'two'], { default: { a: 1, b: 'c', d: true } }); // $ExpectType ParsedOptions
+getopts(['one', 'two'], { unknown: (name) => name === 'name' }); // $ExpectType ParsedOptions
+
+// $ExpectType ParsedOptions
+getopts(
+    ['one', 'two'],
+    {
+        alias: { h: 'help' },
+        boolean: ['verbose'],
+        default: { a: 1, b: 'c', d: true },
+        unknown: (name) => name === 'name'
+    }
+);

types/getopts/index.d.ts

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+// Type definitions for getopts 2.0
+// Project: https://github.com/getopts/getopts#readme
+// Definitions by: Aleh Zasypkin <https://github.com/azasypkin>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface ParsedOptions {
+    _: string[];
+    [key: string]: any;
+}
+
+interface Options {
+    alias?: { [key: string]: string | string[] };
+    boolean?: string[];
+    default?: { [key: string]: any };
+    unknown?: (optionName: string) => boolean;
+}
+
+declare function getopts(argv: string[], options?: Options): ParsedOptions;
+
+export = getopts;

types/getopts/tsconfig.json

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

types/getopts/tslint.json

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