Add lossless-json types (#36596)

As requested at https://github.com/josdejong/lossless-json/pull/10

types/lossless-json/index.d.ts

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+// Type definitions for lossless-json 1.0
+// Project: https://github.com/josdejong/lossless-json#readme
+// Definitions by: André Vitor de Lima Matos <https://github.com/andrevmatos>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Get and/or set configuration options
+ * @param options.circularRefs enable circularRefs (default is true)
+ * @return New/current config
+ */
+export function config({ circularRefs }?: { circularRefs?: boolean }): { circularRefs: boolean };
+/**
+ * The LosslessJSON.parse() method parses a string as JSON, optionally transforming
+ * the value produced by parsing.
+ *
+ * @param text The string to parse as JSON. See the JSON object for a description of JSON syntax.
+ *
+ * @param reviver
+ * If a function, prescribes how the value originally produced by parsing is
+ * transformed, before being returned.
+ *
+ * @returns Returns the Object corresponding to the given JSON text.
+ *
+ * @throws Throws a SyntaxError exception if the string to parse is not valid JSON.
+ */
+
+export function parse(text: string, reviver?: (key: string, value: any) => any): any;
+/**
+ * The LosslessJSON.stringify() method converts a JavaScript value to a JSON string,
+ * optionally replacing values if a replacer function is specified, or
+ * optionally including only the specified properties if a replacer array is specified.
+ *
+ * @param value
+ * The value to convert to a JSON string.
+ *
+ * @param replacer
+ * A function that alters the behavior of the stringification process,
+ * or an array of String and Number objects that serve as a whitelist for
+ * selecting the properties of the value object to be included in the JSON string.
+ * If this value is null or not provided, all properties of the object are
+ * included in the resulting JSON string.
+ *
+ * @param space
+ * A String or Number object that's used to insert white space into the output
+ * JSON string for readability purposes. If this is a Number, it indicates the
+ * number of space characters to use as white space; this number is capped at 10
+ * if it's larger than that. Values less than 1 indicate that no space should be
+ * used. If this is a String, the string (or the first 10 characters of the string,
+ * if it's longer than that) is used as white space. If this parameter is not
+ * provided (or is null), no white space is used.
+ *
+ * @returns String representation of the JSON object.
+ */
+export function stringify(
+  value: any,
+  replacer?: ((key: string, value: any) => any) | Array<string | number>,
+  space?: string | number,
+): string;
+
+/**
+ * A lossless number. Stores its value as string
+ * @param  value
+ */
+export class LosslessNumber {
+  // value as string
+  value: string;
+  type: 'LosslessNumber';
+  isLosslessNumber: true;
+  constructor(value: string | number);
+  /**
+   * Get the value of the LosslessNumber as number.
+   * Will throw an error when this conversion would result in a truncation of the number.
+   * @return Number
+   */
+  valueOf(): number;
+  /**
+   * Get the value of the LosslessNumber as string.
+   * @return string
+   */
+  toString(): string;
+}

types/lossless-json/lossless-json-tests.ts

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+import LosslessJSON = require('lossless-json');
+
+LosslessJSON.config({ circularRefs: false });
+
+const parsed = LosslessJSON.parse('{ "n": 123 }', (key, value) => {
+    if (key && value && value instanceof LosslessJSON.LosslessNumber) {
+        return value.valueOf();
+    }
+    return value;
+});
+
+const str = LosslessJSON.stringify({ n: new LosslessJSON.LosslessNumber(parsed.n) }, undefined, 2);
+if (typeof str !== 'string') throw new Error('not a string');

types/lossless-json/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",
+        "lossless-json-tests.ts"
+    ]
+}

types/lossless-json/tslint.json

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