tsconfig.json

{
    "compilerOptions": {
        "lib": ["esnext", "dom", "es2015"],
        // Target latest version of ECMAScript.
        "target": "esnext",
        // Search under node_modules for non-relative imports.
        "moduleResolution": "node",
        // Process & infer types from .js files.
        "allowJs": true,
        // Enable strictest settings like strictNullChecks & noImplicitAny.
        "strict": false,
        // Disallow features that require cross-file information for emit.
        "experimentalDecorators": true,
        "emitDecoratorMetadata": true,
        // Import non-ES modules as default imports.
        "esModuleInterop": false,
        "allowSyntheticDefaultImports": true,
        "outDir": "dist",
        "module": "commonjs",
        "baseUrl": "./src",
        "paths": {
            "/*": ["*"]
        }
    },
    "include": [
        "src/**/*", "spec/**/*"
    ],
    "exclude": [
        "node_modules"
    ]
}