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@AliceLanniste Hi, I would like to further discuss this function.
In your version, process.env.NODE_ENV will be expanded to typeof process, typeof env, but I think in actual use, the more common usage is as follows:

if (typeof process!== 'undefined' && typeof process.env === "object" && process.env.NODE_ENV === 'production') {
  console.log('production');
}

This will cause typeof process.env === "object" not to be replaced and console.log('production'); won't be executed, which can also be seen in the snapshot of this pr.

Secondly, taking your replacement result typeof process!== as an example, after constructing the replacement regular expression, the default delimiter will be added on both sides of this replacement: \btypeof process!==\b(?!\.). In the above usage, this will not match because the equal sign is not followed by a word boundary.

Before:

Delimiters added: