Merge pull request #23756 from shiftkey/add-textarea-caret-package

add textarea-caret package

types/textarea-caret/index.d.ts

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+// Type definitions for textarea-caret 3.0
+// Project: https://github.com/component/textarea-caret-position
+// Definitions by: Brendan Forster <https://github.com/shiftkey>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+export = textarea_caret;
+
+interface Caret {
+    top: number;
+    left: number;
+    height: number;
+}
+
+interface Options {
+    debug?: boolean;
+}
+
+declare function textarea_caret(element: HTMLElement, position: number, options?: Options): Caret;

types/textarea-caret/textarea-caret-tests.ts

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+import getCaretCoordinates = require('textarea-caret');
+
+const element = document.querySelector('textarea');
+
+element!.addEventListener('input', function() {
+  const caret = getCaretCoordinates(this, this.selectionEnd);
+  console.log('(top, left, height) = (%s, %s, %s)', caret.top, caret.left, caret.height);
+});

types/textarea-caret/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "textarea-caret-tests.ts"
+    ]
+}

types/textarea-caret/tslint.json

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+{
+    "extends": "dtslint/dt.json",
+    "rules": {
+        "indent": [true, "spaces", 4],
+        "max-line-length": [true, 100],
+        "no-any": true
+    }
+}