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If this wasn't possible in the near term, exposing the root component as could work in the interim before the bundler changes land. Webpack has excellent support for emitting bundles that are compatible with CommonJS import syntax, so maybe some of this support could be leveraged in Embroider. That way if lodash was included in an Ember component and in the host application, the vendor bundle would only include one copy. For example, ember build could emit a library Javascript bundle containing just the Ember components, and something like webpack-node-externals to reference the vendor imports. There also doesn't seem to be a concept of initializing the root Ember component with initial arguments at runtime.īuilding Ember components for external useĬomponents also would need to exported in a way where they can be referenced by an external bundler. I'd love it if there was a first-class API for this though. It looks like some support for this lives in the GlimmerJS repo, and a new standalone wrapper could probably be written to hack this together. There isn't currently a thin API to render Ember or Glimmer components by themselves.

Missing API to mount / unmount Ember components

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The current initialization code would need to be handled by the consumer so that the component could be initialized and destroyed when the parent component is unmounting, potentially multiple times within the lifetime of the parent app. The selector for the containing element div is specified at build-time, and the emitted output from ember build contains statements to initialize the app and render it on the page as soon as the bundle finishes parsing. Optionally in the future, these old components can be removed entirely, and the transition to fully Ember components is complete.Įmbedding Ember applications is already documented, but the current approach has a few limitations. As the new app grows in size, 'legacy' components can coexist with newer Ember components, and older components ported over one at a time. The consuming app (React in this case) has a different component model, but it can still seamlessly mount and unmount Ember components and pass data to them. Note that these initial component arguments will only be used for the first render of the Ember component - synchronizing state updates between the parent app and the Ember app left as an exercise for the reader (message passing could be used in this case). This is very similar to the design of ReactDOM.render, but also accepts initial component arguments for the root Ember component. The mount method takes in a reference to the component to be rendered (which it will handle initializing), a DOM node, and a set of initial component arguments. TinyEmber in this example is a fake library that provides a thin API over Ember itself. A few great examples of this are adding type checking with ember-cli-typescript, generating thin wrappers for ES modules with ember-auto-import, or even transforming imports from module syntax import

Because the CLI tooling and the framework are deeply integrated, addons can be developed that make modifications to the build process.

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This post aims to solve these pain points so that teams are free to progressively ship Ember components in their apps and migrate the application over time.Įmber applications are built and packaged with the ember-cli tooling. Teams might choose not to adopt Ember because they can't afford a several month feature freeze to port components over.

However, because the app uses a client-side router, there needs to be a mechanism to load the Ember app and render into a div without resorting to an iframe. However, the team has heard about the many tooling improvements to Ember and wants to experiment shipping a small component in this existing React app. There's already support for pulling in ES modules and rolling them into the production bundle. But what story do we tell for existing apps that are looking to transition to Ember?Ĭonsider a single page application that started in 2016 that uses React and webpack. Ember is great for brand new web applications. In this post I'm proposing some improvements for Ember in an important, but often overlooked use case: embedding Ember components in non-Ember applications.

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