jsconfig.json

{
  "compilerOptions": {
    // Project options
    "target": "esnext", // This sets the target environment for the code.
    "module": "esnext", // This sets the module system for the program.

    // Module resolution
    "baseUrl": "./", // This sets the base directory to resolve non-absolute module names.
    "moduleResolution": "node", // This sets the module resolution strategy. Pretty much always node for modern JS.
    "paths": {}, // This specifies a series of entries which re-map imports to lookup locations relative to the baseUrl.
    "resolveJsonModule": true, // This allows importing modules with a .json extension and generates a type for the import based on the static JSON shape.

    // Strict Checks
    "noImplicitAny": false, // This disables strict checking for when type annotations are not present.
    "alwaysStrict": true, // This ensures that the files are parsed in ECMAScript strict mode and emits "use strict" for each source file.
    "strict": true, // This enables all of the strict mode family options.
    "checkJs": true, // This is the equivalent of including // @ts-check at the top of all JavaScript files which are included in your project.
    "allowUnreachableCode": false, // This allows picking up dead code paths.
    "strictNullChecks": true, // This makes null and undefined have their own distinct types and throws a type error if they are used where a concrete value is expected.
    "forceConsistentCasingInFileNames": true // This ensures that all file names in the project are consistently cased.
  },
  "include": ["src/**/*.js", "test/**/*.js"],
  "exclude": ["dist", "node_modules"] // This specifies which directories should be excluded from the project.
}