Top-level await doesn't work with ts-node typescript files.

[Pokute]

.esmrc: { "await": true }

topAwait.js|ts:console.log(await (new Promise((resolve) => resolve('ok'))));

Above code works if it's run with both node -r esm topAwait.js or ts-node -r esm topAwait.js.

if run with ts-node -r esm topAwait.ts, It fails with topAwait.ts(1,13): error TS2304: Cannot find name 'await'.

[jdalton]

Hi @Pokute!

For ts-node you'll need to do some more ts-node config. See this comment.

[Pokute]

Well spotted, I managed to get it to work with following:

export TS_NODE_IGNORE_DIAGNOSTICS=1308,2304
node -r esm -r ts-node/register topAwait.ts

the order of requires is crucial. For the same reason ts-node -r esm topAwait.ts fails.

Is might be possible to set that global ignore or something similar for TS1308 from esm if top-level await is enabled before ts-node/register is activated since it's very specific to this. Unfortunately TS2304 is more difficult since Cannot find name 'await' is the same error for all unrecognised symbols.

[jdalton]

Did you set the TS target to es2017?

[Pokute]

Target doesn't matter, as long as it's at least es5.

[jdalton]

Based on the comment from the linked issue:

Set target to "es2017" or higher. Otherwise an awaiter is generated by TypeScript and await is rewritten to yield

I'm not a TS user so I don't know if this still holds true.

[pitust]

it still does

[jakobrosenberg]

await () seems to be interpreted as a function.

If I remove the parenthesis I get this instead

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