fix: version-gate Angular 19 runtime instructions (#107)

Angular 19.2 runtime uses different instructions than Angular 20+:
- Combined `propertyInterpolate*`/`attributeInterpolate*`/`stylePropInterpolate*`/
  `styleMapInterpolate*`/`classMapInterpolate*` instead of nested
  `property(interpolate*())` calls
- `hostProperty` instead of `domProperty`

This adds `supports_value_interpolation()` (>= 20) and `supports_dom_property()`
(>= 20) version gates so the compiler emits the correct instructions based on
the target Angular version.

Also fixes `collapse_singleton_interpolations` to only collapse StyleProp/
StyleMap/ClassMap singletons on v20+ (v19 only collapsed Attribute), and
refactors the chaining phase's CHAIN_COMPATIBILITY from LazyLock<FxHashMap>
to a const fn match lookup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Brooooooklyn

crates/oxc_angular_compiler/src/component/metadata.rs

@@ -45,6 +45,23 @@ impl AngularVersion {
         self.major >= 20
     }
 
+    /// Check if this version supports standalone `ɵɵinterpolate*` instructions (v20.0.0+).
+    ///
+    /// Angular v20 introduced standalone `ɵɵinterpolate1`–`ɵɵinterpolateV` instructions
+    /// used as nested calls within `ɵɵproperty`/`ɵɵattribute`. Earlier versions use
+    /// combined `ɵɵpropertyInterpolate*`/`ɵɵattributeInterpolate*` instructions.
+    pub fn supports_value_interpolation(&self) -> bool {
+        self.major >= 20
+    }
+
+    /// Check if this version supports `ɵɵdomProperty` (v20.0.0+).
+    ///
+    /// Angular v20 introduced `ɵɵdomProperty` for host/DomOnly property bindings.
+    /// Earlier versions use `ɵɵhostProperty` instead.
+    pub fn supports_dom_property(&self) -> bool {
+        self.major >= 20
+    }
+
     /// Parse a version string like "19.0.0" or "19.0.0-rc.1".
     ///
     /// Returns `None` if the version string is invalid.

crates/oxc_angular_compiler/src/component/transform.rs

@@ -63,7 +63,7 @@ use crate::pipeline::emit::{
 };
 use crate::pipeline::ingest::{
     HostBindingInput, IngestOptions, ingest_component, ingest_component_with_options,
-    ingest_host_binding,
+    ingest_host_binding, ingest_host_binding_with_version,
 };
 use crate::transform::HtmlToR3Transform;
 use crate::transform::html_to_r3::TransformOptions as R3TransformOptions;
@@ -2423,8 +2423,12 @@ fn compile_component_full<'a>(
     // Pass the template pool's current index to ensure host binding constants
     // continue from where template compilation left off (avoiding duplicate names)
     let template_pool_index = job.pool.next_name_index();
-    let host_binding_output =
-        compile_component_host_bindings(allocator, metadata, template_pool_index);
+    let host_binding_output = compile_component_host_bindings(
+        allocator,
+        metadata,
+        template_pool_index,
+        options.angular_version,
+    );
 
     // Extract the result and update pool index if host bindings were compiled
     let (host_binding_result, host_binding_next_pool_index, host_binding_declarations) =
@@ -3111,6 +3115,7 @@ fn compile_component_host_bindings<'a>(
     allocator: &'a Allocator,
     metadata: &ComponentMetadata<'a>,
     pool_starting_index: u32,
+    angular_version: Option<AngularVersion>,
 ) -> Option<HostBindingCompilationOutput<'a>> {
     let host = metadata.host.as_ref()?;
 
@@ -3134,7 +3139,8 @@ fn compile_component_host_bindings<'a>(
 
     // Ingest and compile the host bindings with the pool starting index
     // This ensures constant names continue from where template compilation left off
-    let mut job = ingest_host_binding(allocator, input, pool_starting_index);
+    let mut job =
+        ingest_host_binding_with_version(allocator, input, pool_starting_index, angular_version);
     let result = compile_host_bindings(&mut job);
 
     // Get the next pool index after host binding compilation

crates/oxc_angular_compiler/src/pipeline/compilation.rs

@@ -261,6 +261,23 @@ impl<'a> ComponentCompilationJob<'a> {
         self.angular_version.map_or(true, |v: AngularVersion| v.supports_conditional_create())
     }
 
+    /// Check if standalone `ɵɵinterpolate*` instructions are supported (Angular 20+).
+    ///
+    /// Returns `true` for Angular 20+ or when version is unknown (None = latest).
+    /// Returns `false` for Angular 19 and earlier, which use combined
+    /// `ɵɵpropertyInterpolate*`/`ɵɵattributeInterpolate*` instructions.
+    pub fn supports_value_interpolation(&self) -> bool {
+        self.angular_version.map_or(true, |v: AngularVersion| v.supports_value_interpolation())
+    }
+
+    /// Check if `ɵɵdomProperty` is supported (Angular 20+).
+    ///
+    /// Returns `true` for Angular 20+ or when version is unknown (None = latest).
+    /// Returns `false` for Angular 19 and earlier, which use `ɵɵhostProperty` instead.
+    pub fn supports_dom_property(&self) -> bool {
+        self.angular_version.map_or(true, |v: AngularVersion| v.supports_dom_property())
+    }
+
     /// Allocates a new cross-reference ID.
     pub fn allocate_xref_id(&mut self) -> XrefId {
         let id = XrefId::new(self.next_xref_id);
@@ -601,6 +618,8 @@ pub struct HostBindingCompilationJob<'a> {
     pub fn_suffix: Atom<'a>,
     /// Diagnostics collected during compilation.
     pub diagnostics: std::vec::Vec<OxcDiagnostic>,
+    /// Angular version for version-gated instruction emission.
+    pub angular_version: Option<AngularVersion>,
 }
 
 impl<'a> HostBindingCompilationJob<'a> {
@@ -646,6 +665,7 @@ impl<'a> HostBindingCompilationJob<'a> {
             mode: TemplateCompilationMode::DomOnly, // Host bindings always use DomOnly
             fn_suffix: Atom::from("HostBindings"),
             diagnostics: std::vec::Vec::new(),
+            angular_version: None,
         }
     }
 
@@ -654,6 +674,16 @@ impl<'a> HostBindingCompilationJob<'a> {
         CompilationJobKind::Host
     }
 
+    /// Check if standalone `ɵɵinterpolate*` instructions are supported (Angular 20+).
+    pub fn supports_value_interpolation(&self) -> bool {
+        self.angular_version.map_or(true, |v| v.supports_value_interpolation())
+    }
+
+    /// Check if `ɵɵdomProperty` is supported (Angular 20+).
+    pub fn supports_dom_property(&self) -> bool {
+        self.angular_version.map_or(true, |v| v.supports_dom_property())
+    }
+
     /// Allocates a new cross-reference ID.
     pub fn allocate_xref_id(&mut self) -> XrefId {
         let id = XrefId::new(self.next_xref_id);

crates/oxc_angular_compiler/src/pipeline/ingest.rs

@@ -3941,13 +3941,24 @@ pub fn ingest_host_binding<'a>(
     allocator: &'a Allocator,
     input: HostBindingInput<'a>,
     pool_starting_index: u32,
+) -> HostBindingCompilationJob<'a> {
+    ingest_host_binding_with_version(allocator, input, pool_starting_index, None)
+}
+
+/// Ingest host bindings into a `HostBindingCompilationJob` with a specific Angular version.
+pub fn ingest_host_binding_with_version<'a>(
+    allocator: &'a Allocator,
+    input: HostBindingInput<'a>,
+    pool_starting_index: u32,
+    angular_version: Option<crate::AngularVersion>,
 ) -> HostBindingCompilationJob<'a> {
     let mut job = HostBindingCompilationJob::with_pool_starting_index(
         allocator,
         input.component_name,
         input.component_selector,
         pool_starting_index,
     );
+    job.angular_version = angular_version;
 
     // Ingest host properties
     for property in input.properties {