trilium/docs/Developer Guide/Developer Guide/Scripting/Server-side imports.md

Server-side imports

Trilium Notes allowed the use of Common.js module imports inside backend scripts, such as:

const isBetween = require('dayjs/plugin/isBetween')
api.dayjs.extend(isBetween)

For TriliumNext, the backend has been switched to use ESM which has a slightly more complicated syntax. Instead of require we now have import but which is asynchronous so it will require an await:

const isBetween = (await import("dayjs/plugin/isBetween")).default;
api.dayjs.extend(isBetween);

Note that .default is also usually needed to obtain the same behaviour as a CJS import. When in doubt, use console.log to see the output of the value returned by await import.