It allows us to specify the root level files. The compiler options required to compile a TypeScript project. It DETERMINES that the said DIRECTORY is the TypeScript project root. Here is a JSON file describing to define a tsconfig.json file containing different parameters of the compilerOptions property:

{

    "compilerOptions": {
    "noImplicitAny": true,
    "module": "system",
    "removeComments": true,
    "strictNullChecks": true,
    "sourceMap": true,
    "allowUnreachableCode": false,
    "outFile": "../JS/TypeScript/BestInterviewQuestion.js"
  }
}

• target: It is used for the compiled OUTPUT.
• module: It is used in the compiled output. the system is for SystemJS, common for CommonJS.
• moduleResolution: It is used to resolve module declaration files (.d.ts files). With the NODE approach, they are loaded from the node_modules.
• sourceMap: generate or not SOURCE map files to debug your application.
• emitDecoratorMetadata: emitDecoratorMetadata emit or not design-type metadata for decorated declarations in the source.
• experimentalDecorators: It enables or not experimental support for ES7 decorators,
• removeComments: remove comments or not
• noImplicitAny: It is used to allow or not the use of variables.