[copy-text-to-clipboard] add typings (#18745)

types/copy-text-to-clipboard/copy-text-to-clipboard-tests.ts

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+import copy = require('copy-text-to-clipboard');
+
+const button: HTMLButtonElement | null = <HTMLButtonElement> document.getElementById('my-button');
+if (button) {
+    button.addEventListener('click', () => {
+        copy('🦄🌈');
+    });
+}

types/copy-text-to-clipboard/index.d.ts

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+// Type definitions for copy-text-to-clipboard 1.0
+// Project: https://github.com/sindresorhus/copy-text-to-clipboard#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = copy;
+
+declare function copy(text: string): boolean;

types/copy-text-to-clipboard/tsconfig.json

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

types/copy-text-to-clipboard/tslint.json

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