Javascript / SyntaxError: await is only valid in async functions and the top level bodies of modules

[aheissenberger]

Node.js v17.5.0 - supports top level async functions and fetch

How to use async functions - eg.

let transform = DM_getPanel(1);
const res = await fetch('https://datastation.multiprocess.io',{method: 'HEAD'})
transform=await res.text()
DM_setPanel(transform);

Error:

Error: [INFO] 2022-02-21T19:57:53 DataStation Runner (Go) development
[INFO] 2022-02-21T19:57:53 Evaling program panel
/private/var/folders/nq/kqg00wpj0yqcdzpzgts7ww440000gn/T/program-panel-2231151971:30
const res = await fetch('https://datastation.multiprocess.io',{method: 'HEAD'})
            ^^^^^

SyntaxError: await is only valid in async functions and the top level bodies of modules
    at Object.compileFunction (node:vm:352:18)
    at wrapSafe (node:internal/modules/cjs/loader:1026:15)
    at Module._compile (node:internal/modules/cjs/loader:1061:27)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1151:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
    at node:internal/main/run_main_module:17:47

Node.js v17.5.0
[INFO] 2022-02-21T19:57:53 Failed to eval: exit status 1

[eatonphil]

If you have Node 17.5.0 installed this will work. DataStation uses your existing Node under the hood.

Otherwise you could wrap the panel in an async function and call it:

(async function() {
  let transform = DM_getPanel(1);
  const res = await fetch('https://datastation.multiprocess.io',{method: 'HEAD'})
  transform=await res.text()
  DM_setPanel(transform);
})()

[aheissenberger]

I have v17.6.0 and it did not work.

How can I add an parameter when the binary is called? adding it in settings fails:

[INFO] 2022-02-23T16:43:25 Failed to eval: fork/exec /opt/homebrew/bin/node --experimental-fetch: no such file or directory

[eatonphil]

Yeah you can't do that yet. I'll add support for it in the next release but until then you might be able to write a bash program:

$ cat /usr/local/bin/node-fetch
#!/usr/bin/env bash
set -e
exec node --experimental-fetch "$@"
$ chmod +x /usr/local/bin/node-fetch

And set /usr/local/bin/node-fetch to be the Node program to execute in settings.

[aheissenberger]

I had to use an absolute path to the node binary but it worked.