I am learning node.js and need to use readline
for a project. I have the following code directly from the readline module example.
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.question('What do you think of Node.js? ', (answer) => {
// TODO: Log the answer in a database
console.log('Thank you for your valuable feedback:', answer);
rl.close();
});
But when I run the code via
node try.js
command, it keeps giving out the errors like below:
rl.question('What is your favorite food?', (answer) => {
^^
SyntaxError: Unexpected token =>
at exports.runInThisContext (vm.js:73:16)
at Module._compile (module.js:443:25)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Function.Module.runMain (module.js:501:10)
at startup (node.js:129:16)
at node.js:814:3
For people who already upgraded node and are running into the same error: For me, this error was coming from eslint. I was using node 14 in my package.json
:
"engines": {
"node": "14"
},
But only got rid of the error after updating the linter .eslintrc.js
config to the following:
"parserOptions": {
"ecmaVersion": 8,
"ecmaFeatures": {
"experimentalObjectRestSpread": true,
"jsx": true,
},
"sourceType": "module",
},
Arrow functions, one of the new features of the ECMAScript 6 standard, were introduced to node.js (as stable feature) only in version 4.0.0.
You can either upgrade your node.js version or use the old syntax, which would look like this:
rl.question('What do you think of Node.js? ', function(answer) {
// TODO: Log the answer in a database
console.log('Thank you for your valuable feedback:', answer);
rl.close();
});
(Note that there is one more difference between those syntaxes: The this
variable behaves differently. It doesn't matter for this example, but it may in others.)
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