await is only valid in async function - eval in async

Question

I want to eval() some lines of code inside of async function. While the following code is ok,

async function foo()
{
  await foo1();
  await foo2();
}

the following throws an error: await is only valid in async function

let ctxScript = 'await foo1(); await foo2();';
async function foo()
{
  eval( ctxScript );
}

How could I handle this? My foo() should be async as it is Puppetteer controller function

Answer 1

foo() should not necessarily be async, as that has no effect on the execution context of eval. Instead, a possible solution is to wrap your ctxScript in a self-executing async function, like so: eval("(async () => {" + ctxScript + "})()")

Answer 2

Here is another way without having to sleep or do anything complex.

In the code you pass to eval(), wrap your entire code in another async function and set it to some variable, for example, EVAL_ASYNC. Then after running eval(ctxScript), run that async function await EVAL_ASYNC.

let ctxScript = 'var EVAL_ASYNC = async function() {await foo1(); await foo2();}';
async function foo()
{
  eval( ctxScript );
  await EVAL_ASYNC();
}