I found some errors in Safari browser (macos and ios).
This line of code throws an error "SyntaxError: Invalid regular expression: invalid group specifier name".

let segment = this.segments[index];
const variable = segment.match(/(?<={)[$0-9a-zA-Z_]+(?==.*})/g) || []; // Error line

if (segment.includes('**')) {

Safari doesn't support lookbehind yet, I think this is the reason for the error.

Environment details

• OS: MacOS, iOS
• Node.js version: 12.18.2
• npm version: 6.14.5
• google-gax version: 2.12.0

Steps to reproduce

1. Open project in Safari on Mac or iOS
2. Open developer console