Invalid regular expression

[fredcallaway]

I get the following error when trying to use the CLI. Note that I've elided the full regex (which is very long)

$ write-good
/usr/local/lib/node_modules/write-good/node_modules/too-wordy/too-wordy.js:244
const wordyRegex = new RegExp(`\\b(?<!-)(${wordyWords.join('|')})\\b`, 'gi');

SyntaxError: Invalid regular expression: /\b(?<!-)(a[\b\s\u200C]*number[\b\s\u200C]*of|abunda [...] Invalid group
    at RegExp (<anonymous>)
    at Object.<anonymous> (/usr/local/lib/node_modules/write-good/node_modules/too-wordy/too-wordy.js:244:20)
    at Module._compile (module.js:569:30)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:503:32)
    at tryModuleLoad (module.js:466:12)
    at Function.Module._load (module.js:458:3)
    at Module.require (module.js:513:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/usr/local/lib/node_modules/write-good/write-good.js:4:18)

node v8.2.1