[w3ctag/design-reviews] TAG Specification review for ModuleServiceWorker (#617)

Ya ya yawm TAG!

I'm requesting a TAG review of ModuleServiceWorker.

Chromium supports three types of workers: Dedicated Workers, Shared Workers, and Service Workers. Importing ES modules has been implemented and shipped for Dedicated Workers, but not for Service Workers. We'd like to launch importing ES modules for service workers, since Service Workers are the foundation of PWAs (Progressive Web Apps) and should support importing ES modules to provide the new PWA features. 

  - Explainer¹ (minimally containing user needs and example code): https://docs.google.com/document/d/1SeQ085YdBTtW3D_ygSpO0Wz2DAe8QiS1gj37IG5lstg/edit#

  - Specification URL: https://w3c.github.io/ServiceWorker/#service-worker-concept

  - Tests: https://docs.google.com/document/d/1aw1sELxXt7usIdkDPYwW0DDOQhpN1ZBuCCSy-XKBtiM/edit

  - Security and Privacy self-review²: n/a
  - GitHub repo (if you prefer feedback filed there): n/a
  - Primary contacts (and their relationship to the specification):
      - Ghazale Hosseinabadi (ghazale-hosseinabadi), Google
      - Asami Doi (d0iasm), Google
      - Hiroki Nakagawa (Nakagawa-Hiroki), Google
      - Matt Falkenhagen (mfalken), Google 
  - Organization(s)/project(s) driving the specification: Google
  - Key pieces of existing multi-stakeholder review or discussion of this specification: n/a
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://www.chromestatus.com/guide/edit/4609574738853888


Further details:

  - [ Yes] I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - Relevant time constraints or deadlines: [please provide]
  - The group where the work on this specification is currently being done:
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue):
  - Major unresolved issues with or opposition to this specification: n/a
  - This work is being funded by: Google

You should also know that...

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