RegExp to replace Nullish coalescing assignment with a custom logic. For old Node.js versions

nullish_coalescing_replacement.md

RegExp Query:

([\(\)\._a-zA-Z]*)\s\?\?=\s([\._a-zA-Z\(\)]*)

RegExp Substitue With:

$1 = ($1 === null || $1 === undefined) ? $2 : $1

Example:

Line

boundary ??= parsedBoundary;

Turns into

boundary = (boundary === null || boundary === undefined) ? parsedBoundary : boundary;