Add types for json-dup-key-validator (#45543)

types/json-dup-key-validator/index.d.ts

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+// Type definitions for json-dup-key-validator 1.0
+// Project: https://github.com/jackyjieliu/json-dup-key-validator
+// Definitions by: Jamie Magee <https://github.com/JamieMagee>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function validate(jsonString: string, allowDuplicatedKeys?: boolean): string | undefined;
+export function parse(jsonString: string, allowDuplicatedKeys?: boolean): object;

types/json-dup-key-validator/json-dup-key-validator-tests.ts

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+import * as jsonValidator from 'json-dup-key-validator';
+
+jsonValidator.parse('{}'); // $ExpectType object
+jsonValidator.parse('{}', false); // $ExpectType object
+jsonValidator.validate('{}'); // $ExpectType string | undefined
+jsonValidator.validate('{}', false); // $ExpectType string | undefined

types/json-dup-key-validator/tsconfig.json

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

types/json-dup-key-validator/tslint.json

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