tsconfig.json

{
  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig to read more about this file */

    /* Language and Environment */
    "target": "es2020" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,

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

    /* Emit */
    "declaration": true /* Generate .d.ts files from TypeScript and JavaScript files in your project. */,
    "outDir": "./dist" /* Specify an output folder for all emitted files. */,

    /* Interop Constraints */
    "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,

    /* Type Checking */
    "strict": true /* Enable all strict type-checking options. */,
    "strictNullChecks": true /* When type checking, take into account 'null' and 'undefined'. */,
    "strictPropertyInitialization": false /* Check for class properties that are declared but not set in the constructor. */,
    "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. */,
    "alwaysStrict": true /* Ensure 'use strict' is always emitted. */,
    "noImplicitAny": true /* Enable error reporting for expressions and declarations with an implied 'any' type. */,
    "noImplicitReturns": true /* Enable error reporting for codepaths that do not explicitly return in a function. */,
    "noUnusedLocals": true /* Enable error reporting when local variables aren't read. */,
    "noImplicitOverride": true /* Ensure overriding members in derived classes are marked with an override modifier. */,
    "noImplicitThis": true /* Enable error reporting when 'this' is given the type 'any'. */,
    "noUncheckedIndexedAccess": true /* Add 'undefined' to a type when accessed using an index. */,
    "noPropertyAccessFromIndexSignature": true /* Enforces using indexed accessors for keys declared using an indexed type. */,
    "noFallthroughCasesInSwitch": true /* Enable error reporting for fallthrough cases in switch statements. */,
    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */

    /* Completeness */
    "skipLibCheck": true /* Skip type checking all .d.ts files. */,
    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */

    /* Internal-use: package paths */
    "paths": {
      "substrate/*": ["./src/*"],
      "substrate": ["./src/index.ts"]
    }
  },

  /**
   * Internal-use: running example scripts
   * We're mostly developing on es2022/Node 18+, but to extend that support a bit futher
   * back our main compiler options are overridden when running with ts-node to use newer
   * syntax, eg. top-level await.
   */
  "ts-node": {
    "esm": true,
    "experimentalSpecifierResolution": "node",
    "compilerOptions": {
      "target": "es2022",
      "module": "es2022",
      "moduleResolution": "node",
      "esModuleInterop": true
    }
  }
}