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Do we need the microtask wrapper in the runtime compiler? #20907

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@NullVoxPopuli NullVoxPopuli commented May 6, 2025 •
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Observed issue:

  • scope bag can include tracked state
  • scope bag is evaluated eagerly when running template() (twice), which means:
    • all tracked state accessed within the scope bag causes the template() compilation to re-compile after each tracked change
    • we probably need to update the underlying compiler and runtime to accept the () => ({}) form of the scope, rather than () => []

Adding queueMicrotask back doesn't solve any of the above.

Why was queueMicrotask removed?

  • we want the added tests to work -- with queueMicrotask, we get either nothing rendered, or an error. 
    class Demo extends Component {
  // should work, currently doesn't, nothing rendered
  component = template('hello world');

  <template>
    <this.component />
  </template>
}

@NullVoxPopuli NullVoxPopuli changed the title Do we need the microtask wrapper here? Do we need the microtask wrapper in the runtime compiler? May 6, 2025
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github-actions bot commented May 6, 2025 •
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Diff

--- main/out.txt	2025-05-05 18:22:36.000000000 +0000
+++ pr/./pr-14864778982/out.txt	2025-05-06 16:26:44.000000000 +0000
@@ -1,5 +1,5 @@
  2.2M └─┬ .
-1015K   ├─┬ @ember
+1014K   ├─┬ @ember
  205K   │ ├─┬ -internals
   69K   │ │ ├─┬ views
   64K   │ │ │ └─┬ lib

Details

This PRmain
Dev 
 2.2M └─┬ .
1014K   ├─┬ @ember
 205K   │ ├─┬ -internals
  69K   │ │ ├─┬ views
  64K   │ │ │ └─┬ lib
  23K   │ │ │   ├── mixins
  22K   │ │ │   ├── system
  10K   │ │ │   ├── views
 4.3K   │ │ │   └── compat
  35K   │ │ ├─┬ runtime
  30K   │ │ │ └─┬ lib
  21K   │ │ │   ├── mixins
 5.7K   │ │ │   └── ext
  26K   │ │ ├─┬ meta
  21K   │ │ │ └── lib
  11K   │ │ ├── owner
 9.4K   │ │ ├── deprecations
 7.4K   │ │ ├── metal
 7.0K   │ │ ├── string
 5.1K   │ │ ├── glimmer
 4.9K   │ │ ├── utils
 4.9K   │ │ ├── routing
 4.5K   │ │ ├── error-handling
 4.5K   │ │ ├── utility-types
 4.2K   │ │ ├── container
 4.2K   │ │ ├── browser-environment
 4.1K   │ │ └── environment
 183K   │ ├─┬ routing
  28K   │ │ └── lib
 149K   │ ├─┬ object
  66K   │ │ └─┬ lib
  62K   │ │   └── computed
 114K   │ ├─┬ template-compiler
 109K   │ │ └─┬ lib
  20K   │ │   ├── plugins
 4.6K   │ │   ├── system
 4.1K   │ │   └── -internal
  66K   │ ├─┬ application
 5.6K   │ │ └── lib
  52K   │ ├─┬ debug
  21K   │ │ └── lib
  38K   │ ├─┬ array
 4.9K   │ │ └── lib
  31K   │ ├─┬ engine
 4.7K   │ │ └── lib
  27K   │ ├── runloop
  22K   │ ├─┬ utils
  18K   │ │ └── lib
  20K   │ ├── helper
  11K   │ ├── destroyable
 9.8K   │ ├── instrumentation
 9.4K   │ ├── controller
 7.4K   │ ├── service
 7.2K   │ ├── owner
 6.2K   │ ├── component
 5.6K   │ ├── canary-features
 5.5K   │ ├── modifier
 5.1K   │ ├── template-compilation
 5.0K   │ ├── enumerable
 5.0K   │ ├── test
 4.4K   │ ├── template
 4.4K   │ ├── renderer
 4.2K   │ ├── deprecated-features
 4.1K   │ ├── template-factory
 4.1K   │ └── version
 709K   ├── shared-chunks
 384K   ├─┬ @glimmer
 166K   │ ├── runtime
  60K   │ ├── opcode-compiler
  30K   │ ├── manager
  22K   │ ├── validator
  14K   │ ├── program
  12K   │ ├── reference
  11K   │ ├── destroyable
  10K   │ ├─┬ tracking
 4.4K   │ │ └── primitives
  10K   │ ├── util
 8.1K   │ ├── node
 7.3K   │ ├── global-context
 6.4K   │ ├── wire-format
 5.0K   │ ├── vm
 4.9K   │ ├── encoder
 4.6K   │ ├── owner
 4.1K   │ └── env
  60K   ├─┬ ember-testing
  56K   │ └─┬ lib
  14K   │   ├── test
  14K   │   ├── helpers
  10K   │   ├── ext
 6.5K   │   └── adapters
  31K   ├── backburner.js
  25K   ├── ember
  24K   ├── route-recognizer
  18K   ├─┬ @simple-dom
  14K   │ └── document
 9.2K   ├── dag-map
 4.3K   ├── rsvp
 4.3K   └── router_js

 2.2M └─┬ .
1015K   ├─┬ @ember
 205K   │ ├─┬ -internals
  69K   │ │ ├─┬ views
  64K   │ │ │ └─┬ lib
  23K   │ │ │   ├── mixins
  22K   │ │ │   ├── system
  10K   │ │ │   ├── views
 4.3K   │ │ │   └── compat
  35K   │ │ ├─┬ runtime
  30K   │ │ │ └─┬ lib
  21K   │ │ │   ├── mixins
 5.7K   │ │ │   └── ext
  26K   │ │ ├─┬ meta
  21K   │ │ │ └── lib
  11K   │ │ ├── owner
 9.4K   │ │ ├── deprecations
 7.4K   │ │ ├── metal
 7.0K   │ │ ├── string
 5.1K   │ │ ├── glimmer
 4.9K   │ │ ├── utils
 4.9K   │ │ ├── routing
 4.5K   │ │ ├── error-handling
 4.5K   │ │ ├── utility-types
 4.2K   │ │ ├── container
 4.2K   │ │ ├── browser-environment
 4.1K   │ │ └── environment
 183K   │ ├─┬ routing
  28K   │ │ └── lib
 149K   │ ├─┬ object
  66K   │ │ └─┬ lib
  62K   │ │   └── computed
 114K   │ ├─┬ template-compiler
 109K   │ │ └─┬ lib
  20K   │ │   ├── plugins
 4.6K   │ │   ├── system
 4.1K   │ │   └── -internal
  66K   │ ├─┬ application
 5.6K   │ │ └── lib
  52K   │ ├─┬ debug
  21K   │ │ └── lib
  38K   │ ├─┬ array
 4.9K   │ │ └── lib
  31K   │ ├─┬ engine
 4.7K   │ │ └── lib
  27K   │ ├── runloop
  22K   │ ├─┬ utils
  18K   │ │ └── lib
  20K   │ ├── helper
  11K   │ ├── destroyable
 9.8K   │ ├── instrumentation
 9.4K   │ ├── controller
 7.4K   │ ├── service
 7.2K   │ ├── owner
 6.2K   │ ├── component
 5.6K   │ ├── canary-features
 5.5K   │ ├── modifier
 5.1K   │ ├── template-compilation
 5.0K   │ ├── enumerable
 5.0K   │ ├── test
 4.4K   │ ├── template
 4.4K   │ ├── renderer
 4.2K   │ ├── deprecated-features
 4.1K   │ ├── template-factory
 4.1K   │ └── version
 709K   ├── shared-chunks
 384K   ├─┬ @glimmer
 166K   │ ├── runtime
  60K   │ ├── opcode-compiler
  30K   │ ├── manager
  22K   │ ├── validator
  14K   │ ├── program
  12K   │ ├── reference
  11K   │ ├── destroyable
  10K   │ ├─┬ tracking
 4.4K   │ │ └── primitives
  10K   │ ├── util
 8.1K   │ ├── node
 7.3K   │ ├── global-context
 6.4K   │ ├── wire-format
 5.0K   │ ├── vm
 4.9K   │ ├── encoder
 4.6K   │ ├── owner
 4.1K   │ └── env
  60K   ├─┬ ember-testing
  56K   │ └─┬ lib
  14K   │   ├── test
  14K   │   ├── helpers
  10K   │   ├── ext
 6.5K   │   └── adapters
  31K   ├── backburner.js
  25K   ├── ember
  24K   ├── route-recognizer
  18K   ├─┬ @simple-dom
  14K   │ └── document
 9.2K   ├── dag-map
 4.3K   ├── rsvp
 4.3K   └── router_js

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@NullVoxPopuli