function generateWarningsFile()

in src/transforms/deprecation-warnings.ts [278:341]
46 lines of code
7 McCabe index (conditional complexity)

function generateWarningsFile(projectRoot: string, functionDeclarations: ts.FunctionDeclaration[]) {
  const names = [...functionDeclarations].map((d) => d.name?.text).filter(Boolean);
  const exportedSymbols = [WARNING_FUNCTION_NAME, GET_PROPERTY_DESCRIPTOR, DEPRECATION_ERROR, ...names].join(',');

  const functionText = `function ${WARNING_FUNCTION_NAME}(name, deprecationMessage) {
  const deprecated = process.env.JSII_DEPRECATED;
  const deprecationMode = ['warn', 'fail', 'quiet'].includes(deprecated) ? deprecated : 'warn';
  const message = \`\${name} is deprecated.\\n  \${deprecationMessage.trim()}\\n  This API will be removed in the next major release.\`;
  switch (deprecationMode) {
    case "fail":
      throw new ${DEPRECATION_ERROR}(message);
    case "warn":
      console.warn("[WARNING]", message);
      break;
  }
}

function ${GET_PROPERTY_DESCRIPTOR}(obj, prop) {
  const descriptor = Object.getOwnPropertyDescriptor(obj, prop);
  if (descriptor) {
    return descriptor;
  }
  const proto = Object.getPrototypeOf(obj);
  const prototypeDescriptor = proto && getPropertyDescriptor(proto, prop);
  if (prototypeDescriptor) {
    return prototypeDescriptor;
  }
  return {};
}

const ${VISITED_OBJECTS_SET_NAME} = new Set();

class ${DEPRECATION_ERROR} extends Error {
  constructor(...args) {
    super(...args);
    Object.defineProperty(this, 'name', {
      configurable: false,
      enumerable: true,
      value: '${DEPRECATION_ERROR}',
      writable: false,
    });
  }
}

module.exports = {${exportedSymbols}}
`;

  const printer = ts.createPrinter({ newLine: ts.NewLineKind.LineFeed });
  const resultFile = ts.createSourceFile(
    path.join(projectRoot, WARNINGSCODE_FILE_NAME),
    functionText,
    ts.ScriptTarget.Latest,
    false,
    ts.ScriptKind.JS,
  );

  const declarations = functionDeclarations.map((declaration) =>
    printer.printNode(ts.EmitHint.Unspecified, declaration, resultFile),
  );

  const content = declarations.concat(printer.printFile(resultFile)).join('\n');

  fs.writeFileSync(path.join(projectRoot, WARNINGSCODE_FILE_NAME), content);
}