Utilizing async/await, I aim to showcase the data obtained from a readable stream prior to displaying the corresponding message.
Below is my code snippet:
var stream = async function (){
var myStream = fs.createReadStream(__dirname+"/someText.txt",'utf8');
await myStream.on('data', (chunk)=>{
console.log(chunk)// This content should be displayed first
})
}
stream()
console.log('listening') // Subsequently, this message will be shown
Rather than waiting for promises, be cautious of using await with myStream.on('data'). Although possible, it will essentially resolve instantaneously.
To properly handle stream listeners with promises, encapsulate the listener in a Promise and await its resolution using once
const { once } = require('events');
var processDataFromStream = async function (){
var myStream = fs.createReadStream(__dirname+"/someText.txt",'utf8');
myStream.on('data', (chunk) => {
console.log(chunk)// Displaying first
});
// Waits until all data is read or error occurs
await once(myStream, 'close');
}
(async() => {
await processDataFromStream(); // `async` function required for `await`
console.log('listening');
})().catch(console.error);
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