Stability: 1 - Experimental

    In addition to direct mappings, Node.js also supports nested condition objects.

    For example, to define a package that only has dual mode entry points for use in Node.js but not the browser:

    1. {
    2.   "main": "./main.js",
    3.   "exports": {
    4.     "node": {
    5.       "import": "./feature-node.mjs",
    6.       "require": "./feature-node.cjs"
    7.     },
    8.     "default": "./feature.mjs",
    9.   }
    10. }

    Conditions continue to be matched in order as with flat conditions. If a nested conditional does not have any mapping it will continue checking the remaining conditions of the parent condition. In this way nested conditions behave analogously to nested JavaScript if statements.