Add types for windows-foreground-love (#40267)

types/windows-foreground-love/index.d.ts

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+// Type definitions for windows-foreground-love 0.3
+// Project: https://github.com/the-ress/node-windows-foreground-love#readme
+// Definitions by: Tereza Tomcova <https://github.com/the-ress>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function allowSetForegroundWindow(pid?: number): boolean;

types/windows-foreground-love/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",
+        "windows-foreground-love-tests.ts"
+    ]
+}

types/windows-foreground-love/tslint.json

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

types/windows-foreground-love/windows-foreground-love-tests.ts

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+import * as wfl from "windows-foreground-love";
+
+wfl.allowSetForegroundWindow(123); // $ExpectType boolean
+wfl.allowSetForegroundWindow(); // $ExpectType boolean