This will be done via special NPM URLs. The Deno Development Team wrote the following.
We want Deno to be accessible and solve problems, and so we’ve been working on some updates that will allow Deno to easily import NPM packages and make 80-90% of NPM packages work in Deno within the next three months.
In response to extensive use of Deno, stewards of the platform will be launching office hours for those leveraging Deno in a commercial setting. Persons with issues about Deno can submit questions via an online form.