49 lines
2.7 KiB
Markdown
49 lines
2.7 KiB
Markdown
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When I first created starmelon in September 2021 there was a hacky workaround
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for setTimeout I had to inject into the generated javascript. Now in Nov 2023
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after upgrading deno to 0.127 I find that `globalThis.__boostrap.timers` is no
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longer defined. Now the elm code seems to work without requring this hack.
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However I don't have any correctness tests for starmelon. To reduce the risk of
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forgetting how it was working I have included the hacks from
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src/exec/scripting.rs:168
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```rust
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// I think that when I set this script to be the main module, I am skipping the
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// deno/runtime/js/99_main.js script that sets up a bunch of global variables. If I
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// manually add the timer related code below then setTimeout works again.
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// NB. there are 706 lines of setup code that add a bunch of apis to the global window
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// scope. Figure out if I need to include all of them. For example, starmelon does not need
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// to perform http calls right now, but I eventually want to.
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final_script.push_str("const { setTimeout } = globalThis.__bootstrap.timers;\n");
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final_script.push_str(
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"Deno.core.setMacrotaskCallback(globalThis.__bootstrap.timers.handleTimerMacrotask);\n",
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);
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final_script.push_str("globalThis.setTimeout = setTimeout;\n");
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```
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Somewhere between `deno_runtime` version 0.127 and 0.147 they decided to remove
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`deno_core::op` macro and replace it with `deno_core::op2`. As far as I can
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tell, the `op2` macro offers greater control of how values are passed between
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Rust and JavaScript.
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In Jan 2024 they moved operations to a virtual module
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`import { op_example } from "ext:core/ops`. You can only access this virtual
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module in the bootstrap ESM scripts of an `deno_core::Extension`. Consequently
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what I have done is write a bootstrap script that imports the ops and reassigns
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them as properties of `globalThis.Extension` object. All of my extensions are
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merged onto the same object. It appears the Deno.core is deleted by the time
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the `deno_runtime::worker::MainWorker` runs the main module.
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`Deno[Deno.internal].core.ops` still exists but does not contain the ops our
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Extensions defined.
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An aside is that if you construct a JsRuntime directly and add Extensions then
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those ops will show up on `Deno.core.ops`. But they will not be enumerable
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properties, so you will have to use `Object.getOwnPropertyNames(Deno.core.ops)`
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to visually confirm the ops are there. My current understanding in April 2024
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is that MainWorker includes a JsRuntime, but then also applies all of the
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`deno_runtime` extensions that make the JS enviroment feature comparable with
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Node. For example setTimeout does not exist in a new JsRuntime but does exist
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in a new MainWorker.
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You can find some of the extensions that Deno provides in
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[https://github.com/denoland/deno/tree/main/runtime/js]
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