Add typings for just-pick (#30605)

types/just-pick/index.d.ts

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+// Type definitions for just-pick 2.1
+// Project: https://github.com/angus-c/just#readme
+// Definitions by: Peter Safranek <https://github.com/pe8ter>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+declare function pick<T, U extends keyof T>(obj: T, select: U[]): Pick<T, U>;
+
+declare function pick<T, U extends keyof T>(obj: T, select1: U, ...selectn: U[]): Pick<T, U>;
+
+export = pick;

types/just-pick/just-pick-tests.ts

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+import pick = require("just-pick");
+
+const a = "a";
+const b = "b";
+const c = "c";
+const obj = { a, b };
+
+pick(obj, []); // $ExpectType Pick<{ a: string; b: string; }, never>
+pick(obj, [a]); // $ExpectType Pick<{ a: string; b: string; }, "a">
+pick(obj, [a, a]); // $ExpectType Pick<{ a: string; b: string; }, "a">
+pick(obj, [a, b]); // $ExpectType Pick<{ a: string; b: string; }, "a" | "b">
+pick(obj, [a, b, c]); // $ExpectError
+
+pick(obj, a); // $ExpectType Pick<{ a: string; b: string; }, "a">
+pick(obj, a, a); // $ExpectType Pick<{ a: string; b: string; }, "a">
+pick(obj, a, b); // $ExpectType Pick<{ a: string; b: string; }, "a" | "b">
+pick(obj, a, b, c); // $ExpectError
+
+pick(); // $ExpectError
+pick(obj); // $ExpectError
+pick(obj, 0); // $ExpectError
+pick(obj, false); // $ExpectError
+pick(obj, null); // $ExpectError
+pick(obj, undefined); // $ExpectError
+pick(obj, {}); // $ExpectError
+pick(obj, () => {}); // $ExpectError

types/just-pick/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",
+        "just-pick-tests.ts"
+    ]
+}

types/just-pick/tslint.json

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+{
+    "extends": "dtslint/dt.json",
+    "rules": {
+        "file-name-casing": false
+    }
+}