tsconfig.json

{
  "compilerOptions": {
    ////////// General //////////
    "target": "ES6",
    /* ES6 does not support IE, but for NODE modules is ok, to react modules use ESNext. */

    "module": "CommonJS",
    /* CommonJS for "normal modules", ESNext for react modules */

    // "lib": [],
    /* Libraries for functions in higher ecmascript versions. */

    // "jsx": "preserve",
    /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */

    "declaration": true,

    "outDir": "./build",

    "rootDir": "./src",
    
    ////////// Strict //////////
    "strict": true,
    /* This activates all the strict rules */ 

    ////////// Additional Checks //////////
    "noUnusedLocals": true,
    /* Report errors on unused locals. */

    "noUnusedParameters": true,
    /* Report errors on unused parameters. */

    "noImplicitReturns": true, 
    /* Report error when not all code paths in function return a value. */

    "noFallthroughCasesInSwitch": true,
    /* Report errors for fallthrough cases in switch statement. */

    "noUncheckedIndexedAccess": true,
    /* Include 'undefined' in index signature results */

    "noImplicitOverride": true,
    /* Ensure overriding members in derived classes are marked with an 'override' modifier. */

    "noPropertyAccessFromIndexSignature": true, 
    /* Require undeclared properties from index signatures to use element accesses. */

    // "paths": {},
    /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */

    "esModuleInterop": true,
    /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */

    ////////// Advanced Options //////////
    "skipLibCheck": true,
    /* Skip type checking of declaration files. */

    "forceConsistentCasingInFileNames": true
    /* Disallow inconsistently-cased references to the same file. */
  },
  "include": ["src/**/*"],
}