feat(plugin/macros): Export new interface for getting plugin schema v…

…ersion (swc-project#5166)

.github/workflows/cargo.yml

@@ -115,7 +115,7 @@ jobs:
           - crate: swc
             os: ubuntu-latest
             check: |
-              cargo hack check --feature-powerset --no-dev-deps --exclude-features debug --exclude-features plugin
+              cargo hack check --feature-powerset --no-dev-deps --exclude-features debug --exclude-features plugin --exclude-features plugin-transform-schema-v1
           - crate: swc
             os: windows-latest
           - crate: swc_atoms
@@ -136,7 +136,7 @@ jobs:
           - crate: swc_common
             os: ubuntu-latest
             check: |
-              cargo hack check --feature-powerset --no-dev-deps
+              cargo hack check --feature-powerset --no-dev-deps --exclude-features plugin-transform-schema-vtest
           - crate: swc_common
             os: windows-latest
           - crate: swc_config
@@ -398,9 +398,15 @@ jobs:
             swc-exec-cache-${{ matrix.settings.crate }}-${{ runner.os }}
 
       - name: Run cargo test
+        if: matrix.settings.crate != 'swc_plugin_runner'
         run: |
           cargo test --color always -p ${{ matrix.settings.crate }}
 
+      - name: Run cargo test (plugin)
+        if: matrix.settings.crate == 'swc_plugin_runner'
+        run: |
+          cargo test --color always -p swc_plugin_runner --features plugin-transform-schema-v1
+
       - name: Run cargo test (all features)
         if: matrix.settings.crate == 'swc_ecma_parser' || matrix.settings.crate == 'swc_ecma_loader' || matrix.settings.crate == 'swc_ecma_transforms'
         run: |

crates/binding_core_node/Cargo.toml

@@ -16,7 +16,10 @@ crate-type = ["cdylib"]
 default = ["swc_v1", "plugin"]
 plugin = [
   "swc/plugin",
+  "swc/plugin-transform-schema-v1",
+  "swc_common/plugin-transform-schema-v1",
   "swc_plugin_runner/default",
+  "swc_plugin_runner/plugin-transform-schema-v1",
   "wasmer/default",
   "wasmer-wasi/default",
 ]

crates/binding_core_wasm/Cargo.toml

@@ -20,6 +20,7 @@ swc_v2 = []
 plugin = [
   "swc/plugin",
   "swc_plugin_runner/memory_cache",
+  "swc_plugin_runner/plugin-transform-schema-v1",
   "wasmer",
   "wasmer-wasi",
   "wasmer/js-default",

crates/swc/Cargo.toml

@@ -22,6 +22,10 @@ default = ["es3"]
 es3 = []
 node = ["napi", "napi-derive"]
 plugin = ["swc_plugin_runner", "swc_plugin_proxy/plugin-rt"]
+plugin-transform-schema-v1 = [
+  "swc_common/plugin-transform-schema-v1",
+  "swc_plugin_runner/plugin-transform-schema-v1"
+]
 
 [dependencies]
 ahash = "0.7.4"

crates/swc/src/plugin.rs

@@ -127,6 +127,10 @@ impl RustPlugins {
                                 &self.source_map,
                             )?;
 
+                        if !transform_plugin_executor.is_transform_schema_compatible()? {
+                            anyhow::bail!("Cannot execute incompatible plugin {}", &p.0);
+                        }
+
                         let span = tracing::span!(
                             tracing::Level::INFO,
                             "serialize_context",

crates/swc_cli/Cargo.toml

@@ -18,6 +18,7 @@ default = []
 plugin = [
   "swc/plugin",
   "swc_plugin_runner/filesystem_cache",
+  "swc_plugin_runner/plugin-transform-schema-v1",
   "wasmer/default",
   "wasmer-wasi/default",
 ]

crates/swc_common/Cargo.toml

@@ -26,6 +26,8 @@ plugin-mode = ["plugin-base"]
 plugin-rt = ["plugin-base"]
 rkyv-impl = ["rkyv", "bytecheck"]
 tty-emitter = ["atty", "termcolor"]
+plugin-transform-schema-v1 = []
+plugin-transform-schema-vtest = []
 
 [dependencies]
 ahash = "0.7.4"

crates/swc_common/src/plugin.rs

@@ -12,6 +12,28 @@ use rkyv::{with::AsBox, Archive, Deserialize, Serialize};
 
 use crate::{syntax_pos::Mark, SyntaxContext};
 
+/**
+ * Compile-time version constant for the AST struct schema's version.
+ *
+ * NOTE: this is for PARTIAL compatibility only, supporting if AST struct
+ * adds new properties without changing / removing existing properties.
+ *
+ * - When adding a new properties to the AST struct:
+ *  1. Create a new feature flag in cargo.toml
+ *  2. Create a new schema version with new feature flag.
+ *  3. Create a new AST struct with compile time feature flag with newly
+ *     added properties. Previous struct should remain with existing feature
+ *     flag, or add previous latest feature flag.
+ *
+ * - When removing, or changing existing properties in the AST struct: TBD
+ */
+#[cfg(feature = "plugin-transform-schema-v1")]
+pub const PLUGIN_TRANSFORM_AST_SCHEMA_VERSION: u32 = 1;
+
+// Reserved for the testing purpose.
+#[cfg(feature = "plugin-transform-schema-vtest")]
+pub const PLUGIN_TRANSFORM_AST_SCHEMA_VERSION: u32 = u32::MAX - 1;
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 #[non_exhaustive]
 #[cfg_attr(

crates/swc_plugin/Cargo.toml

@@ -22,6 +22,7 @@ quote = ["swc_ecma_quote"]
 swc_atoms = { version = "0.2.0", path = "../swc_atoms" }
 swc_common = { version = "0.23.0", path = "../swc_common", features = [
   "plugin-mode",
+  "plugin-transform-schema-v1"
 ] }
 swc_ecma_quote = { version = "0.25.0", path = "../swc_ecma_quote", optional = true }
 swc_ecmascript = { version = "0.179.0", path = "../swc_ecmascript", features = ["utils", "visit", "rkyv-impl"] }

crates/swc_plugin/src/lib.rs

@@ -3,7 +3,10 @@
 // Reexports
 pub use swc_common::{
     chain,
-    plugin::{deserialize_from_ptr, PluginError, PluginSerializedBytes, VersionedSerializable},
+    plugin::{
+        deserialize_from_ptr, PluginError, PluginSerializedBytes, VersionedSerializable,
+        PLUGIN_TRANSFORM_AST_SCHEMA_VERSION,
+    },
 };
 
 pub mod comments {

crates/swc_plugin_macro/src/lib.rs

@@ -21,6 +21,8 @@ fn handle_func(func: ItemFn) -> TokenStream {
     let ident = func.sig.ident.clone();
     let transform_process_impl_ident =
         Ident::new("__transform_plugin_process_impl", Span::call_site());
+    let transform_schema_version_ident =
+        Ident::new("__get_transform_plugin_schema_version", Span::call_site());
 
     let ret = quote! {
         #func
@@ -55,6 +57,11 @@ fn handle_func(func: ItemFn) -> TokenStream {
             1
         }
 
+        #[no_mangle]
+        pub fn #transform_schema_version_ident() -> u32 {
+            swc_plugin::PLUGIN_TRANSFORM_AST_SCHEMA_VERSION
+        }
+
         // Macro to allow compose plugin's transform function without manual pointer operation.
         // Internally it wraps pointer operation also bubbles up error in forms of PluginError.
         // There are some cases error won't be wrapped up however - for example, we expect

crates/swc_plugin_runner/Cargo.toml

@@ -19,6 +19,9 @@ filesystem_cache = ["wasmer-cache"]
 # Supports a cache allow to store wasm module in-memory. This avoids recompilation
 # to the same module in a single procress lifecycle.
 memory_cache = []
+plugin-transform-schema-v1 = [
+  "swc_common/plugin-transform-schema-v1"
+]
 
 [dependencies]
 anyhow = "1.0.42"
@@ -28,7 +31,7 @@ serde = { version = "1.0.126", features = ["derive"] }
 serde_json = "1.0.64"
 swc_common = { version = "0.23.0", path = "../swc_common", features = [
   "plugin-rt",
-  "concurrent",
+  "concurrent"
 ] }
 swc_ecma_ast = { version = "0.84.0", path = "../swc_ecma_ast", features = [
   "rkyv-impl",

crates/swc_plugin_runner/src/transform_executor.rs

@@ -3,7 +3,7 @@ use std::sync::Arc;
 use anyhow::{anyhow, Error};
 use parking_lot::Mutex;
 use swc_common::{
-    plugin::{PluginError, PluginSerializedBytes},
+    plugin::{PluginError, PluginSerializedBytes, PLUGIN_TRANSFORM_AST_SCHEMA_VERSION},
     SourceMap,
 };
 use wasmer::Instance;
@@ -14,6 +14,8 @@ use crate::memory_interop::write_into_memory_view;
 pub struct TransformExecutor {
     // Main transform interface plugin exports
     exported_plugin_transform: wasmer::NativeFunc<(i32, i32, i32, i32, i32, i32, i32), i32>,
+    // Schema version interface exports
+    exported_plugin_transform_schema_version: wasmer::NativeFunc<(), u32>,
     // `__free` function automatically exported via swc_plugin sdk to allow deallocation in guest
     // memory space
     exported_plugin_free: wasmer::NativeFunc<(i32, i32), i32>,
@@ -42,6 +44,9 @@ impl TransformExecutor {
                 .get_native_function::<(i32, i32, i32, i32, i32, i32, i32), i32>(
                     "__transform_plugin_process_impl",
                 )?,
+            exported_plugin_transform_schema_version: instance
+                .exports
+                .get_native_function::<(), u32>("__get_transform_plugin_schema_version")?,
             exported_plugin_free: instance
                 .exports
                 .get_native_function::<(i32, i32), i32>("__free")?,
@@ -103,14 +108,28 @@ impl TransformExecutor {
     }
 
     /**
-     * Check compile-time versions of AST schema between the plugin and
+     * Check compile-time version of AST schema between the plugin and
      * the host. Returns true if it's compatible, false otherwise.
      *
      * Host should appropriately handle if plugin is not compatible to the
      * current runtime.
      */
-    pub fn is_transform_schema_compatible(&self) -> bool {
-        todo!("Not supported yet");
+    pub fn is_transform_schema_compatible(&self) -> Result<bool, Error> {
+        let plugin_schema_version = self.exported_plugin_transform_schema_version.call();
+
+        match plugin_schema_version {
+            Ok(plugin_schema_version) => {
+                let host_schema_version = PLUGIN_TRANSFORM_AST_SCHEMA_VERSION;
+
+                // TODO: this is incomplete
+                if plugin_schema_version == host_schema_version {
+                    Ok(true)
+                } else {
+                    Ok(false)
+                }
+            }
+            Err(e) => Err(anyhow!("Failed to call plugin's schema version: {}", e)),
+        }
     }
 
     #[tracing::instrument(level = "info", skip_all)]

crates/swc_plugin_runner/tests/integration.rs

@@ -24,6 +24,14 @@ fn build_plugin(dir: &Path) -> Result<PathBuf, Error> {
         cmd.args(["build", "--target=wasm32-wasi"])
             .stderr(Stdio::inherit());
         cmd.output()?;
+
+        if !cmd
+            .status()
+            .expect("Exit code should be available")
+            .success()
+        {
+            return Err(anyhow!("Failed to build plugin"));
+        }
     }
 
     for entry in fs::read_dir(&dir.join("target").join("wasm32-wasi").join("debug"))? {