Help with a language definition for Node.js REPL interactions?

[Axel Rauschmayer]

Node.js REPL interactions are pretty easy to highlight:

• A line starting with > is input.
• All other lines are output.
• Additionally, I’m coloring comments at the end of input lines differently.

I’ve written a language definition, but it sends Highlight.js into an infinite loop if it encounters an empty line:

const hljs = require('highlight.js');

hljs.registerLanguage('repl',

    hljs => ({

        contains: [

            { begin: '^> ', end: '$', // input

                contains: [

                    { className: 'comment', begin: '//', end: '$' },

                ],

            },

            { className: 'meta', begin: '^', end: '$' }, // output

        ],

    }));

const txt = `

> foo(true) // call foo

'abc'

> 3 + 3

6

`.trim();

console.log(hljs.highlight('repl', txt).value);

Any idea how to fix that?

It feels like I’m triggering a Highlight.js bug. I’ve created a GitHub issue here: https://github.com/isagalaev/highlight.js/issues/1573