Add package for ink-testing-library (#33842)

types/ink-testing-library/index.d.ts

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+// Type definitions for ink-testing-library 1.0
+// Project: https://github.com/vadimdemedes/ink-testing-library#readme
+// Definitions by: Sam Palmer <https://github.com/MancunianSam>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.9
+
+import { Component, InkElement } from "ink";
+export interface RenderResponse {
+    rerender: (tree: InkElement) => void;
+    unmount: () => void;
+    stdin: {
+        write: (data: any) => boolean;
+    };
+    frames: ReadonlyArray<string>;
+    lastFrame: () => string;
+}
+export function cleanup(): void;
+export function render(tree: InkElement): RenderResponse;

types/ink-testing-library/ink-testing-library-tests.tsx

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+/** @jsx h */
+import { render, RenderResponse, cleanup } from "ink-testing-library";
+import { Component, h } from "ink";
+
+const renderResponse = render(<Component<{}, {}, {}> />); // $ExpectType RenderResponse
+
+renderResponse.frames; // $ExpectType ReadonlyArray<string>
+
+const rerender = renderResponse.rerender; // $ExpectType (tree: InkElement) => void
+rerender(<Component<{}, {}, {}> />); // $ExpectType void
+
+const unmount = renderResponse.unmount; // $ExpectType () => void
+unmount(); // $ExpectType void
+
+const stdin = renderResponse.stdin; // $ExpectType { write: (data: any) => boolean; }
+stdin.write(""); // $ExpectType boolean
+stdin.write([]); // $ExpectType boolean
+stdin.write({}); // $ExpectType boolean
+
+const lastFrame = renderResponse.lastFrame; // $ExpectType () => string
+lastFrame(); // $ExpectType string
+
+cleanup; // $ExpectType () => void
+cleanup(); // $ExpectType void

types/ink-testing-library/tsconfig.json

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+{
+    "compilerOptions": {
+        "jsx": "react",
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "allowSyntheticDefaultImports": true,
+        "strictFunctionTypes": true
+    },
+    "files": [
+        "index.d.ts", 
+        "ink-testing-library-tests.tsx"
+    ]
+}

types/ink-testing-library/tslint.json

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