Add typings for anchor-js (#23957)

types/anchor-js/anchor-js-tests.ts

@@ -0,0 +1,16 @@
+anchors.add();
+anchors.add('h1');
+anchors.add().add('h2');
+
+anchors.remove();
+anchors.remove('h1');
+anchors.remove().remove('h2');
+
+anchors.removeAll();
+
+const headerAnchors = new AnchorJS();
+
+const footerAnchors = new AnchorJS({
+    placement: 'right',
+});
+footerAnchors.remove('.links');

types/anchor-js/index.d.ts

@@ -0,0 +1,41 @@
+// Type definitions for anchor-js 4.1
+// Project: https://github.com/bryanbraun/anchorjs
+// Definitions by: Brian Surowiec <https://github.com/xt0rted>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare namespace anchorjs {
+    interface Anchor {
+        options: AnchorOptions;
+
+        add(selector?: string): Anchor;
+        remove(selector?: string): Anchor;
+        removeAll(): void;
+    }
+
+    type AnchorPlacement = 'left' | 'right';
+    type AnchorVisibility = 'always' | 'hover' | 'touch';
+
+    interface AnchorOptions {
+        arialabel?: string;
+        class?: string;
+        icons?: string;
+        placement?: AnchorPlacement;
+        truncate?: number;
+        visible?: AnchorVisibility;
+    }
+
+    interface AnchorStatic {
+        new(options?: AnchorOptions): Anchor;
+    }
+}
+
+declare const anchors: anchorjs.Anchor;
+declare const AnchorJS: anchorjs.AnchorStatic;
+
+export = AnchorJS;
+
+export as namespace AnchorJS;
+
+declare global {
+    const anchors: anchorjs.Anchor;
+}

types/anchor-js/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",
+        "anchor-js-tests.ts"
+    ]
+}

types/anchor-js/tslint.json

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