Merge pull request #30162 from azizhk/just-debounce-it

Add definitions for just-debounce-it

types/just-debounce-it/index.d.ts

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+// Type definitions for just-debounce-it 1.1
+// Project: https://github.com/angus-c/just#readme
+// Definitions by: Aziz Khambati <https://github.com/azizhk>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+type ArgumentTypes<F extends Function> = F extends (...args: infer A) => any ? A : never;
+
+/*~ This declaration specifies that the function
+ *~ is the exported object from the file
+ */
+export = debounce;
+
+declare function debounce<T extends Function>(
+    fn: T,
+    wait?: 0,
+    callFirst?: boolean
+): T;
+
+declare function debounce<T extends Function>(
+    fn: T,
+    wait: number,
+    callFirst: true
+): T;
+
+declare function debounce<T extends Function>(
+    fn: T,
+    wait: number,
+    callFirst?: false
+): (...args: ArgumentTypes<T>) => void;

types/just-debounce-it/just-debounce-it-tests.ts

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+import debounce = require("just-debounce-it");
+
+const doThings = () => 1;
+
+const num: number = debounce(doThings)();
+const num2: number = debounce(doThings, 0)();
+const num3: number = debounce(doThings, 0, true)();
+const num4: number = debounce(doThings, 0, false)();
+const num5: number = debounce(doThings, 1000, true)();
+
+// $ExpectType void
+debounce(doThings, 1000)();
+
+const exclaim = (a: string) => a + '!';
+
+const str: string = debounce(exclaim)('hey');
+const str2: string = debounce(exclaim, 0)('hi');
+const str3: string = debounce(exclaim, 0, true)('hi');
+const str4: string = debounce(exclaim, 0, false)('hi');
+const str5: string = debounce(exclaim, 1000, true)('hooray');
+
+// $ExpectType void
+debounce(exclaim, 1000)('hello');

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

types/just-debounce-it/tslint.json

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+{
+  "extends": "dtslint/dt.json",
+  "rules": {
+    "ban-types": false
+  }
+}