README.md

main.js:

export function configure(aurelia) {
  aurelia.use
    .standardConfiguration()
    .developmentLogging();

  // Assuming a file named "knockout-custom-attribute.js", containing the
  // custom attribute class defined above, exists in the root of the project:
  aurelia.use.globalResources('./knockout-custom-attribute');

  aurelia.start().then(a => a.setRoot());
}

usage:

<!-- apply the "knockout" attribute to sections of html containing knockout bindings -->
<div knockout>
  <input data-bind="value: firstName">
  <input data-bind="value: lastName">
</div>

knockout-custom-attribute.js

import ko from 'ko';

export class KnockoutCustomAttribute {
  static inject = [Element];

  constructor(element) {
    this.element = element;
  }

  bind(bindingContext) {
    ko.applyBindings(bindingContext, this.element)
  }
  
  unbind() {
    ko.cleanNode(this.element);
  }
}