feat: deprecate import assertions (#25281)

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

cli/emit.rs

@@ -112,8 +112,7 @@ impl Emitter {
         let parsed_source_cache = self.parsed_source_cache.clone();
         let transpile_and_emit_options =
           self.transpile_and_emit_options.clone();
-        let (should_cache, transpile_result) =
-          deno_core::unsync::spawn_blocking({
+        let transpile_result = deno_core::unsync::spawn_blocking({
           let specifier = specifier.clone();
           let source = source.clone();
           move || -> Result<_, AnyError> {
@@ -133,7 +132,6 @@ impl Emitter {
           specifier,
           transpile_result,
           source_hash,
-          should_cache,
         ))
       }
     }
@@ -150,8 +148,7 @@ impl Emitter {
     match helper.pre_emit_parsed_source(specifier, source) {
       PreEmitResult::Cached(emitted_text) => Ok(emitted_text),
       PreEmitResult::NotCached { source_hash } => {
-        let (should_cache, transpile_result) =
-          EmitParsedSourceHelper::transpile(
+        let transpile_result = EmitParsedSourceHelper::transpile(
           &self.parsed_source_cache,
           specifier,
           source.clone(),
@@ -163,7 +160,6 @@ impl Emitter {
           specifier,
           transpile_result,
           source_hash,
-          should_cache,
         ))
       }
     }
@@ -261,16 +257,13 @@ impl<'a> EmitParsedSourceHelper<'a> {
     media_type: MediaType,
     transpile_options: &deno_ast::TranspileOptions,
     emit_options: &deno_ast::EmitOptions,
-  ) -> Result<(bool, TranspileResult), AnyError> {
+  ) -> Result<TranspileResult, AnyError> {
     // nothing else needs the parsed source at this point, so remove from
     // the cache in order to not transpile owned
     let parsed_source = parsed_source_cache
       .remove_or_parse_module(specifier, source, media_type)?;
-    let should_cache = !has_import_assertion(&parsed_source);
-    Ok((
-      should_cache,
-      parsed_source.transpile(transpile_options, emit_options)?,
-    ))
+    ensure_no_import_assertion(&parsed_source)?;
+    Ok(parsed_source.transpile(transpile_options, emit_options)?)
   }
 
   pub fn post_emit_parsed_source(
@@ -278,8 +271,6 @@ impl<'a> EmitParsedSourceHelper<'a> {
     specifier: &ModuleSpecifier,
     transpile_result: TranspileResult,
     source_hash: u64,
-    // todo(dsherret): remove after Deno 2.0
-    should_cache: bool,
   ) -> ModuleCodeBytes {
     let transpiled_source = match transpile_result {
       TranspileResult::Owned(source) => source,
@@ -289,44 +280,47 @@ impl<'a> EmitParsedSourceHelper<'a> {
       }
     };
     debug_assert!(transpiled_source.source_map.is_none());
-    if should_cache {
     self.0.emit_cache.set_emit_code(
       specifier,
       source_hash,
       &transpiled_source.source,
     );
-    }
     transpiled_source.source.into_boxed_slice().into()
   }
 }
 
-fn has_import_assertion(parsed_source: &deno_ast::ParsedSource) -> bool {
+// todo(dsherret): this is a temporary measure until we have swc erroring for this
+fn ensure_no_import_assertion(
+  parsed_source: &deno_ast::ParsedSource,
+) -> Result<(), AnyError> {
   fn has_import_assertion(text: &str) -> bool {
     // good enough
     text.contains(" assert ") && !text.contains(" with ")
   }
 
-  fn warn_import_attribute(
+  fn create_err(
     parsed_source: &deno_ast::ParsedSource,
     range: SourceRange,
-  ) {
+  ) -> AnyError {
     let text_info = parsed_source.text_info_lazy();
     let loc = text_info.line_and_column_display(range.start);
-    deno_runtime::import_assertion_callback(
-      deno_core::ImportAssertionsSupportCustomCallbackArgs {
-        maybe_specifier: Some(parsed_source.specifier().to_string()),
-        maybe_line_number: Some(loc.line_number),
-        column_number: loc.column_number,
-        maybe_source_line: Some(range.text_fast(text_info).to_string()),
-      },
-    )
+    let mut msg = "Import assertions are deprecated. Use `with` keyword, instead of 'assert' keyword.".to_string();
+    msg.push_str("\n\n");
+    msg.push_str(range.text_fast(text_info));
+    msg.push_str("\n\n");
+    msg.push_str(&format!(
+      "  at {}:{}:{}\n",
+      parsed_source.specifier(),
+      loc.line_number,
+      loc.column_number,
+    ));
+    deno_core::anyhow::anyhow!("{}", msg)
   }
 
   let Some(module) = parsed_source.program_ref().as_module() else {
-    return false;
+    return Ok(());
   };
 
-  let mut had_import_assertion = false;
   for item in &module.body {
     match item {
       deno_ast::swc::ast::ModuleItem::ModuleDecl(decl) => match decl {
@@ -334,24 +328,21 @@ fn has_import_assertion(parsed_source: &deno_ast::ParsedSource) -> bool {
           if n.with.is_some()
             && has_import_assertion(n.text_fast(parsed_source.text_info_lazy()))
           {
-            had_import_assertion = true;
-            warn_import_attribute(parsed_source, n.range());
+            return Err(create_err(parsed_source, n.range()));
           }
         }
         deno_ast::swc::ast::ModuleDecl::ExportAll(n) => {
           if n.with.is_some()
             && has_import_assertion(n.text_fast(parsed_source.text_info_lazy()))
           {
-            had_import_assertion = true;
-            warn_import_attribute(parsed_source, n.range());
+            return Err(create_err(parsed_source, n.range()));
           }
         }
         deno_ast::swc::ast::ModuleDecl::ExportNamed(n) => {
           if n.with.is_some()
             && has_import_assertion(n.text_fast(parsed_source.text_info_lazy()))
           {
-            had_import_assertion = true;
-            warn_import_attribute(parsed_source, n.range());
+            return Err(create_err(parsed_source, n.range()));
           }
         }
         deno_ast::swc::ast::ModuleDecl::ExportDecl(_)
@@ -364,5 +355,6 @@ fn has_import_assertion(parsed_source: &deno_ast::ParsedSource) -> bool {
       deno_ast::swc::ast::ModuleItem::Stmt(_) => {}
     }
   }
-  had_import_assertion
+
+  Ok(())
 }

tests/specs/cache/json_import/main.ts

@@ -1,2 +1,2 @@
-import asdf from "./test.json" assert { type: "json" };
+import asdf from "./test.json" with { type: "json" };
 console.log(asdf);

tests/specs/run/ts_import_assertions/__test__.jsonc

@@ -3,10 +3,12 @@
     "assertion": {
       "steps": [{
         "args": "run assertion.ts",
+        "exitCode": 1,
         "output": "assertion.out"
       }, {
         // should output the same because the emit won't be cached
         "args": "run assertion.ts",
+        "exitCode": 1,
         "output": "assertion.out"
       }]
     },

tests/specs/run/ts_import_assertions/assertion.out

@@ -1,14 +1,6 @@
-⚠️  Import assertions are deprecated. Use `with` keyword, instead of 'assert' keyword.
+error: Import assertions are deprecated. Use `with` keyword, instead of 'assert' keyword.
 
 import test from "./data.json" assert { type: "json" };
 
   at file:///[WILDLINE]/assertion.ts:1:1
 
-{ prop: "data" }
-⚠️  Import assertions are deprecated. Use `with` keyword, instead of 'assert' keyword.
-
-console.log((await import("./data.json", {
-
-  at file:///[WILDLINE]/assertion.ts:5:13
-
-{ prop: "data" }

tests/testdata/import_attributes/static_export.out

@@ -1,7 +1 @@
-⚠️  Import assertions are deprecated. Use `with` keyword, instead of 'assert' keyword.
-
-export { default } from "./data.json" assert { type: "json" };
-
-  at file:///[WILDLINE]
-
 { a: "b", c: { d: 10 } }

tests/testdata/import_attributes/static_import.out

@@ -1,8 +1,2 @@
-⚠️  Import assertions are deprecated. Use `with` keyword, instead of 'assert' keyword.
-
-import data2 from "./data.json" assert { type: "json" };
-
-  at file:///[WILDLINE]
-
 { a: "b", c: { d: 10 } }
 { a: "b", c: { d: 10 } }

tests/testdata/import_attributes/static_import.ts

@@ -1,6 +1,5 @@
 import data1 from "./data.json" with { type: "json" };
-// deno-lint-ignore no-import-assertions
-import data2 from "./data.json" assert { type: "json" };
+import data2 from "./data.json" with { type: "json" };
 
 console.log(data1);
 console.log(data2);

tests/testdata/import_attributes/static_reexport.ts

@@ -1 +1 @@
-export { default } from "./data.json" assert { type: "json" };
+export { default } from "./data.json" with { type: "json" };