await outside of async function doesn't throw error in console












12














MDN says:




Remember, the await keyword is only valid inside async functions. If you use it outside of an async function's body, you will get a SyntaxError.




But that's not true.



Try this code in DevTools console, no errors, just result:



async function a(val) { return val; }

await a(10) // await is not inside async function

10


What's wrong with the code or docs?






javascript asynchronous async-await console google-chrome-devtools







share|improve this question




















  • 1




    even just a simple await 10; prints 10
    – quirimmo
    Dec 23 at 17:27










  • or await Promise.resolve(10)
    – Callam
    Dec 23 at 17:34






  • 2




    it looks like has been supported since almost one year: chromium.googlesource.com/chromium/src.git/+/…
    – quirimmo
    Dec 23 at 17:37






  • 1




    It works on root level, but you would always write functions in program and you cant use await without making the function async
    – Sumer
    Dec 23 at 17:47
















12














MDN says:




Remember, the await keyword is only valid inside async functions. If you use it outside of an async function's body, you will get a SyntaxError.




But that's not true.



Try this code in DevTools console, no errors, just result:



async function a(val) { return val; }

await a(10) // await is not inside async function

10


What's wrong with the code or docs?






javascript asynchronous async-await console google-chrome-devtools







share|improve this question




















  • 1




    even just a simple await 10; prints 10
    – quirimmo
    Dec 23 at 17:27










  • or await Promise.resolve(10)
    – Callam
    Dec 23 at 17:34






  • 2




    it looks like has been supported since almost one year: chromium.googlesource.com/chromium/src.git/+/…
    – quirimmo
    Dec 23 at 17:37






  • 1




    It works on root level, but you would always write functions in program and you cant use await without making the function async
    – Sumer
    Dec 23 at 17:47














12












12








12


1





MDN says:




Remember, the await keyword is only valid inside async functions. If you use it outside of an async function's body, you will get a SyntaxError.




But that's not true.



Try this code in DevTools console, no errors, just result:



async function a(val) { return val; }

await a(10) // await is not inside async function

10


What's wrong with the code or docs?






javascript asynchronous async-await console google-chrome-devtools







share|improve this question















MDN says:




Remember, the await keyword is only valid inside async functions. If you use it outside of an async function's body, you will get a SyntaxError.




But that's not true.



Try this code in DevTools console, no errors, just result:



async function a(val) { return val; }

await a(10) // await is not inside async function

10


What's wrong with the code or docs?






javascript asynchronous async-await console google-chrome-devtools




javascript asynchronous async-await console google-chrome-devtools






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Dec 23 at 20:52









Bergi

363k58540866




363k58540866










asked Dec 23 at 17:24









Green

7,38830100171




7,38830100171








  • 1




    even just a simple await 10; prints 10
    – quirimmo
    Dec 23 at 17:27










  • or await Promise.resolve(10)
    – Callam
    Dec 23 at 17:34






  • 2




    it looks like has been supported since almost one year: chromium.googlesource.com/chromium/src.git/+/…
    – quirimmo
    Dec 23 at 17:37






  • 1




    It works on root level, but you would always write functions in program and you cant use await without making the function async
    – Sumer
    Dec 23 at 17:47














  • 1




    even just a simple await 10; prints 10
    – quirimmo
    Dec 23 at 17:27










  • or await Promise.resolve(10)
    – Callam
    Dec 23 at 17:34






  • 2




    it looks like has been supported since almost one year: chromium.googlesource.com/chromium/src.git/+/…
    – quirimmo
    Dec 23 at 17:37






  • 1




    It works on root level, but you would always write functions in program and you cant use await without making the function async
    – Sumer
    Dec 23 at 17:47








1




1




even just a simple await 10; prints 10
– quirimmo
Dec 23 at 17:27




even just a simple await 10; prints 10
– quirimmo
Dec 23 at 17:27












or await Promise.resolve(10)
– Callam
Dec 23 at 17:34




or await Promise.resolve(10)
– Callam
Dec 23 at 17:34




2




2




it looks like has been supported since almost one year: chromium.googlesource.com/chromium/src.git/+/…
– quirimmo
Dec 23 at 17:37




it looks like has been supported since almost one year: chromium.googlesource.com/chromium/src.git/+/…
– quirimmo
Dec 23 at 17:37




1




1




It works on root level, but you would always write functions in program and you cant use await without making the function async
– Sumer
Dec 23 at 17:47




It works on root level, but you would always write functions in program and you cant use await without making the function async
– Sumer
Dec 23 at 17:47












2 Answers
2






active

oldest

votes


















9














MDN docs is right and it explains how it works in JavaScript.



This is just a feature added by the DevTools for making you easier to test async/await code. And it is not a JavaScript feature.



It looks like it has been supported since 11/08/2017 in DevTools:



https://chromium.googlesource.com/chromium/src.git/+/e8111c396fef38da6654093433b4be93bed01dce



If you spy the



ConsoleModel.js



at line 129, they have the function for evaluating expressions marked as async:



async evaluateCommandInConsole





share|improve this answer



















  • 2




    Nice detective work.
    – cgTag
    Dec 23 at 17:42



















7














Nothing is wrong.



You've found a special feature of the DevTools console! It is there to make it as easy as possible to experiment with async-await code in a live environment. You can imagine that any code you enter in the console is wrapped in an async function automatically. In fact, as another answer pointed out, this is exactly what happens.



It's important to note that even though this works in the console, it is not a feature of JavaScript.



So, all of your observations are correct and expected! The MDN docs are accurate, because if you try to load a script on a page that uses await outside of an async function, it will error. On the other hand the DevTools console is designed to make this work (exclusively for developer ergonomics), so your code runs without any errors in the console.



This isn't the only trick the DevTools console has up its sleeve. In general if you really want to test how some code runs on a page, it's best to actually run the script on the page, not in the console.






share|improve this answer























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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    9














    MDN docs is right and it explains how it works in JavaScript.



    This is just a feature added by the DevTools for making you easier to test async/await code. And it is not a JavaScript feature.



    It looks like it has been supported since 11/08/2017 in DevTools:



    https://chromium.googlesource.com/chromium/src.git/+/e8111c396fef38da6654093433b4be93bed01dce



    If you spy the



    ConsoleModel.js



    at line 129, they have the function for evaluating expressions marked as async:



    async evaluateCommandInConsole





    share|improve this answer



















    • 2




      Nice detective work.
      – cgTag
      Dec 23 at 17:42
















    9














    MDN docs is right and it explains how it works in JavaScript.



    This is just a feature added by the DevTools for making you easier to test async/await code. And it is not a JavaScript feature.



    It looks like it has been supported since 11/08/2017 in DevTools:



    https://chromium.googlesource.com/chromium/src.git/+/e8111c396fef38da6654093433b4be93bed01dce



    If you spy the



    ConsoleModel.js



    at line 129, they have the function for evaluating expressions marked as async:



    async evaluateCommandInConsole





    share|improve this answer



















    • 2




      Nice detective work.
      – cgTag
      Dec 23 at 17:42














    9












    9








    9






    MDN docs is right and it explains how it works in JavaScript.



    This is just a feature added by the DevTools for making you easier to test async/await code. And it is not a JavaScript feature.



    It looks like it has been supported since 11/08/2017 in DevTools:



    https://chromium.googlesource.com/chromium/src.git/+/e8111c396fef38da6654093433b4be93bed01dce



    If you spy the



    ConsoleModel.js



    at line 129, they have the function for evaluating expressions marked as async:



    async evaluateCommandInConsole





    share|improve this answer














    MDN docs is right and it explains how it works in JavaScript.



    This is just a feature added by the DevTools for making you easier to test async/await code. And it is not a JavaScript feature.



    It looks like it has been supported since 11/08/2017 in DevTools:



    https://chromium.googlesource.com/chromium/src.git/+/e8111c396fef38da6654093433b4be93bed01dce



    If you spy the



    ConsoleModel.js



    at line 129, they have the function for evaluating expressions marked as async:



    async evaluateCommandInConsole






    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited Dec 24 at 13:12

























    answered Dec 23 at 17:41









    quirimmo

    5,26111129




    5,26111129








    • 2




      Nice detective work.
      – cgTag
      Dec 23 at 17:42














    • 2




      Nice detective work.
      – cgTag
      Dec 23 at 17:42








    2




    2




    Nice detective work.
    – cgTag
    Dec 23 at 17:42




    Nice detective work.
    – cgTag
    Dec 23 at 17:42













    7














    Nothing is wrong.



    You've found a special feature of the DevTools console! It is there to make it as easy as possible to experiment with async-await code in a live environment. You can imagine that any code you enter in the console is wrapped in an async function automatically. In fact, as another answer pointed out, this is exactly what happens.



    It's important to note that even though this works in the console, it is not a feature of JavaScript.



    So, all of your observations are correct and expected! The MDN docs are accurate, because if you try to load a script on a page that uses await outside of an async function, it will error. On the other hand the DevTools console is designed to make this work (exclusively for developer ergonomics), so your code runs without any errors in the console.



    This isn't the only trick the DevTools console has up its sleeve. In general if you really want to test how some code runs on a page, it's best to actually run the script on the page, not in the console.






    share|improve this answer




























      7














      Nothing is wrong.



      You've found a special feature of the DevTools console! It is there to make it as easy as possible to experiment with async-await code in a live environment. You can imagine that any code you enter in the console is wrapped in an async function automatically. In fact, as another answer pointed out, this is exactly what happens.



      It's important to note that even though this works in the console, it is not a feature of JavaScript.



      So, all of your observations are correct and expected! The MDN docs are accurate, because if you try to load a script on a page that uses await outside of an async function, it will error. On the other hand the DevTools console is designed to make this work (exclusively for developer ergonomics), so your code runs without any errors in the console.



      This isn't the only trick the DevTools console has up its sleeve. In general if you really want to test how some code runs on a page, it's best to actually run the script on the page, not in the console.






      share|improve this answer


























        7












        7








        7






        Nothing is wrong.



        You've found a special feature of the DevTools console! It is there to make it as easy as possible to experiment with async-await code in a live environment. You can imagine that any code you enter in the console is wrapped in an async function automatically. In fact, as another answer pointed out, this is exactly what happens.



        It's important to note that even though this works in the console, it is not a feature of JavaScript.



        So, all of your observations are correct and expected! The MDN docs are accurate, because if you try to load a script on a page that uses await outside of an async function, it will error. On the other hand the DevTools console is designed to make this work (exclusively for developer ergonomics), so your code runs without any errors in the console.



        This isn't the only trick the DevTools console has up its sleeve. In general if you really want to test how some code runs on a page, it's best to actually run the script on the page, not in the console.






        share|improve this answer














        Nothing is wrong.



        You've found a special feature of the DevTools console! It is there to make it as easy as possible to experiment with async-await code in a live environment. You can imagine that any code you enter in the console is wrapped in an async function automatically. In fact, as another answer pointed out, this is exactly what happens.



        It's important to note that even though this works in the console, it is not a feature of JavaScript.



        So, all of your observations are correct and expected! The MDN docs are accurate, because if you try to load a script on a page that uses await outside of an async function, it will error. On the other hand the DevTools console is designed to make this work (exclusively for developer ergonomics), so your code runs without any errors in the console.



        This isn't the only trick the DevTools console has up its sleeve. In general if you really want to test how some code runs on a page, it's best to actually run the script on the page, not in the console.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Dec 23 at 22:17









        Bergi

        363k58540866




        363k58540866










        answered Dec 23 at 22:06









        Caleb Miller

        3007




        3007






























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