tsconfig.json

{
  "compilerOptions": {

    /* Projects */

    /* Language and Environment */
    "target": "es2020",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */

    /* Modules */
    "module": "commonjs",                                /* Specify what module code is generated. */
    "moduleResolution": "node",                          /* Specify how TypeScript looks up a file from a given module specifier. */

    /* JavaScript Support */

    /* Emit */
    "outDir": "./build",                                   /* Specify an output folder for all emitted files. */
    "removeComments": true,                           /* Disable emitting comments. */
    "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
    "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */

    /* Interop Constraints */
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */

    /* Type Checking */
    "strict": true,                                      /* Enable all strict type-checking options. */
    "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied `any` type. */
    "strictNullChecks": true,                         /* When type checking, take into account `null` and `undefined`. */
    "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
    "strictBindCallApply": true,                      /* Check that the arguments for `bind`, `call`, and `apply` methods match the original function. */
    "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
    "noImplicitThis": true,                           /* Enable error reporting when `this` is given the type `any`. */
    "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
    "noUnusedLocals": true,                           /* Enable error reporting when a local variables aren't read. */
    "noUnusedParameters": false,                       /* Raise an error when a function parameter isn't read */
    "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
    "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
    "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
    "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
    "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type */

    /* Completeness */
    "skipLibCheck": true,                                 /* Skip type checking all .d.ts files. */
  },
  "baseUrl": ".",
  "include": [
    "src/**/*.ts",
  ],
  "exclude": [
    "node_modules",
    "coverage",
    "**/*.spec.ts"
  ]
}