salix/loopback/common/mixins/loggable.js

const LoopBackContext = require('loopback-context');
async function handleObserve(ctx) {
    const httpCtx = LoopBackContext.getCurrentContext();
    ctx.options.userId = httpCtx?.active?.accessToken?.userId;
}
module.exports = function(Self) {
    let Mixin = {
        'before save': handleObserve,
        'before delete': handleObserve,
    };
    for (const [listener, handler] of Object.entries(Mixin))
        Self.observe(listener, handler);
};