Add type definitions for js-roman-numerals (#40033)

types/js-roman-numerals/index.d.ts

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+// Type definitions for js-roman-numerals 1.1
+// Project: https://github.com/bcotrim/roman-numerals
+// Definitions by: Ricardo Mello <https://github.com/ricardo-mello>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.5
+
+declare class RomanNumeral {
+    constructor(value: number | string);
+    toInt(): number;
+    toString(): string;
+}
+
+export = RomanNumeral;

types/js-roman-numerals/js-roman-numerals-tests.ts

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+import RomanNumeral = require('js-roman-numerals');
+
+function constructorTests() {
+    const x = new RomanNumeral(10); // '10' | 'X'
+    const y = new RomanNumeral('V'); // '5' | 'V'
+}
+
+function functionTests() {
+    const x = new RomanNumeral(10);
+    const y: number = x.toInt();
+    const z: string = x.toString();
+}

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

types/js-roman-numerals/tslint.json

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