Regression in 1.21.2

[rarkins]

Our test suite at Renovate Bot is getting failures for 1.21.2. We previously saw memory problems for 1.21.0 and reverted it, but tests were passing, as they were for 1.21.1. However for 1.21.2 we're seeing failed tests across a number of modules within Renovate.

Here is a minimal code snippet which behaves differently between the two versions:

const re2 = require('re2');

const regex = re2(/^.*?/);

const match = regex.exec('');

console.warn(match);

Result in v1.21.1:

[ '', index: 0, input: '', groups: undefined ]

Result in v1.21.2:

[ undefined, index: 0, input: '', groups: undefined ]

[uhop]

Published as 1.21.3.