write-pkg: add library definitions.

types/write-pkg/index.d.ts

@@ -0,0 +1,15 @@
+// Type definitions for write-pkg 3.1
+// Project: https://github.com/sindresorhus/write-pkg#readme
+// Definitions by: Aleh Zasypkin <https://github.com/azasypkin>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface WritePkg {
+    (path: string, data: { [k: string]: any }): Promise<void>;
+    (data: { [k: string]: any }): Promise<void>;
+    sync(path: string, data: { [k: string]: any }): void;
+    sync(data: { [k: string]: any }): void;
+}
+
+declare const writePkg: WritePkg;
+
+export = writePkg;

types/write-pkg/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "write-pkg-tests.ts"
+    ]
+}

types/write-pkg/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }

types/write-pkg/write-pkg-tests.ts

@@ -0,0 +1,6 @@
+import WritePkg = require('write-pkg');
+
+WritePkg('package.json', { version: 1 }); // $ExpectType Promise<void>
+WritePkg({ version: 1 }); // $ExpectType Promise<void>
+WritePkg.sync('package.json', { version: 1 }); // $ExpectType void
+WritePkg.sync({ version: 1 }); // $ExpectType void