Add assert-equal-jsx (#15884)

types/assert-equal-jsx/assert-equal-jsx-tests.tsx

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+import * as React from 'react';
+import assertEqualJSX = require('assert-equal-jsx');
+
+function sanitizeId(str: string): string {
+  return str.replace(/my-component-id-(\d+)/ig, 'my-component-id-0');
+}
+
+assertEqualJSX(
+  <div id='my-component-id-314159265' />,
+  // should equal:
+  <div id='my-component-id-0' />,
+  // with sanitization:
+  {
+    sanitize: sanitizeId
+  }
+);

types/assert-equal-jsx/index.d.ts

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+// Type definitions for assert-equal-jsx 1.0
+// Project: https://github.com/thejameskyle/assert-equal-jsx
+// Definitions by: Josh Toft <https://github.com/seryl>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+import * as React from 'react';
+
+declare namespace assertEqualJSX {
+	interface AsssertOptions {
+		sanitize?(str: string): string;
+	}
+}
+
+declare function assertEqualJSX(actual: JSX.Element, expected: JSX.Element, opts?: assertEqualJSX.AsssertOptions): void;
+
+export = assertEqualJSX;

types/assert-equal-jsx/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "jsx": "react",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "assert-equal-jsx-tests.tsx"
+    ]
+}

types/assert-equal-jsx/tslint.json

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