CODEWITHSUNDEEP
javascriptnode.jsecmascript-6babeljs
Mark Philips
Mark Philips

Reputation: 135

Variables declaration in Babel-node

I'm using babel-node for execute this simple statement:

let obj = {};

But when i run, the following error appears: 

SyntaError: repl: Only 'var' variables are supported in repl

I tried to run 'var' rather than 'let', but it appeared :

undefined

then i cannot access the variable

Upvotes: 2

Views: 1778

Answers (1)

Seth
Seth

Reputation: 10454

This is because when using the babel-node repl you must load the presets of your choice to activate their respective es2015 features.

To do so you need to run:

npm install babel-preset-es2015

Then when booting up the babel repl, you'll have to specify the presets:

babel-node --presets es2015

Now you can then use let obj = {}

Regarding the undefined output, babel-node and even the node repl, this is expected and default behavior. Per the node REPL docs:

ignoreUndefined - if set to true, then the repl will not output the return value of command if it's undefined. Defaults to false.

This means that any anytime you invoke something in the repl, undefined is returned.

Upvotes: 2

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