Function printFunction

src/language-js/print/function.js:39–91

(path, options, print, args)

- `TSDeclareFunction`(TypeScript)
*/
function printFunction(path, options, print, args) {
  if (isMethodValue(path)) {
    return printMethodValue(path, options, print);
  }

  const { node } = path;

  let shouldExpandParameters = false;
  if (node.type === "FunctionExpression" && args?.expandLastArg) {
    const { parent } = path;
    if (
      isCallExpression(parent) &&
      (getCallArguments(parent).length > 1 ||
        getFunctionParameters(node).every(
          (param) => param.type === "Identifier" && !param.typeAnnotation,
        ))
    ) {
      shouldExpandParameters = true;
    }
  }

  const parametersDoc = printFunctionParameters(
    path,
    options,
    print,
    shouldExpandParameters,
  );
  const returnTypeDoc = printReturnType(path, print);
  const shouldGroupParameters = shouldGroupFunctionParameters(
    node,
    returnTypeDoc,
  );

  const isFlowHookDeclaration = node.type === "HookDeclaration";
  const keyword = isFlowHookDeclaration ? "hook" : "function";

  return [
    printDeclareToken(path),
    node.async ? "async " : "",
    keyword,
    node.generator ? "*" : "",
    " ",
    node.id ? print("id") : "",
    print("typeParameters"),
    group([
      shouldGroupParameters ? group(parametersDoc) : parametersDoc,
      returnTypeDoc,
    ]),
    node.body ? " " : "",
    print("body"),
    node.declare || !node.body ? printSemicolon(options) : "",
  ];
}

/*
- `FunctionDeclaration`