fix: ban import assertions during publishing

api/src/analysis.rs

@@ -5,6 +5,7 @@ use std::collections::HashSet;
 use std::sync::Arc;
 
 use deno_ast::swc::common::comments::CommentKind;
+use deno_ast::swc::common::Span;
 use deno_ast::LineAndColumnDisplay;
 use deno_ast::MediaType;
 use deno_ast::ModuleSpecifier;
@@ -727,6 +728,54 @@ fn check_for_banned_syntax(
             continue;
           }
         },
+        ast::ModuleDecl::Import(n) => {
+          if let Some(with) = &n.with {
+            let range =
+              Span::new(n.src.span.hi(), with.span.lo(), n.src.span.ctxt)
+                .range();
+            let keyword = parsed_source.text_info().range_text(&range);
+            if keyword.contains("assert") {
+              let (line, column) = line_col(&with.span.range());
+              return Err(PublishError::BannedImportAssertion {
+                specifier: parsed_source.specifier().to_string(),
+                line,
+                column,
+              });
+            }
+          }
+        }
+        ast::ModuleDecl::ExportNamed(n) => {
+          if let Some(with) = &n.with {
+            let src = n.src.as_ref().unwrap();
+            let range =
+              Span::new(src.span.hi(), with.span.lo(), src.span.ctxt).range();
+            let keyword = parsed_source.text_info().range_text(&range);
+            if keyword.contains("assert") {
+              let (line, column) = line_col(&with.span.range());
+              return Err(PublishError::BannedImportAssertion {
+                specifier: parsed_source.specifier().to_string(),
+                line,
+                column,
+              });
+            }
+          }
+        }
+        ast::ModuleDecl::ExportAll(n) => {
+          if let Some(with) = &n.with {
+            let range =
+              Span::new(n.src.span.hi(), with.span.lo(), n.src.span.ctxt)
+                .range();
+            let keyword = parsed_source.text_info().range_text(&range);
+            if keyword.contains("assert") {
+              let (line, column) = line_col(&with.span.range());
+              return Err(PublishError::BannedImportAssertion {
+                specifier: parsed_source.specifier().to_string(),
+                line,
+                column,
+              });
+            }
+          }
+        }
         _ => continue,
       },
       ast::ModuleItem::Stmt(n) => match n {
@@ -920,5 +969,29 @@ mod tests {
 
     let x = parse("import express = React.foo;");
     assert!(super::check_for_banned_syntax(&x).is_ok());
+
+    let x = parse("import './data.json' assert { type: 'json' }");
+    let err = super::check_for_banned_syntax(&x).unwrap_err();
+    assert!(
+      matches!(err, super::PublishError::BannedImportAssertion { .. }),
+      "{err:?}",
+    );
+
+    let x = parse("export { a } from './data.json' assert { type: 'json' }");
+    let err = super::check_for_banned_syntax(&x).unwrap_err();
+    assert!(
+      matches!(err, super::PublishError::BannedImportAssertion { .. }),
+      "{err:?}",
+    );
+
+    let x = parse("export * from './data.json' assert { type: 'json' }");
+    let err = super::check_for_banned_syntax(&x).unwrap_err();
+    assert!(
+      matches!(err, super::PublishError::BannedImportAssertion { .. }),
+      "{err:?}",
+    );
+
+    let x = parse("export * from './data.json' with { type: 'json' }");
+    assert!(super::check_for_banned_syntax(&x).is_ok(), "{err:?}",);
   }
 }

api/src/publish.rs

@@ -972,6 +972,41 @@ pub mod tests {
     assert_eq!(error.code, "invalidPath");
   }
 
+  #[tokio::test]
+  async fn import_assertions() {
+    let t = TestSetup::new().await;
+
+    let bytes = create_mock_tarball("import_assertions");
+    let task = process_tarball_setup2(
+      &t,
+      bytes,
+      &PackageName::try_from("foo").unwrap(),
+      &Version::try_from("1.2.3").unwrap(),
+      false,
+    )
+    .await;
+    assert_eq!(task.status, PublishingTaskStatus::Failure, "{task:#?}");
+    let error = task.error.unwrap();
+    assert_eq!(error.code, "bannedImportAssertion");
+    assert_eq!(error.message, "import assertions are not allowed, use import attributes instead (replace 'assert' with 'with') file:///mod.ts:1:29");
+  }
+
+  #[tokio::test]
+  async fn import_attributes() {
+    let t = TestSetup::new().await;
+
+    let bytes = create_mock_tarball("import_attributes");
+    let task = process_tarball_setup2(
+      &t,
+      bytes,
+      &PackageName::try_from("foo").unwrap(),
+      &Version::try_from("1.2.3").unwrap(),
+      false,
+    )
+    .await;
+    assert_eq!(task.status, PublishingTaskStatus::Success, "{task:#?}");
+  }
+
   #[tokio::test]
   async fn jsr_jsonc() {
     let t = TestSetup::new().await;

api/src/tarball.rs

@@ -485,7 +485,7 @@ pub enum PublishError {
   #[error("invalid external import to '{specifier}', only 'jsr:', 'npm:', 'data:' and 'node:' imports are allowed ({info})")]
   InvalidExternalImport { specifier: String, info: String },
 
-  #[error("Modifying global types is not allowed {specifier}:{line}:{column}")]
+  #[error("modifying global types is not allowed {specifier}:{line}:{column}")]
   GlobalTypeAugmentation {
     specifier: String,
     line: usize,
@@ -499,13 +499,20 @@ pub enum PublishError {
     column: usize,
   },
 
-  #[error("Triple slash directives that modify globals (for example, '/// <reference no-default-lib=\"true\" />' or '/// <reference lib=\"dom\" />') are not allowed. Instead instruct the user of your package to specify these directives. {specifier}:{line}:{column}")]
+  #[error("triple slash directives that modify globals (for example, '/// <reference no-default-lib=\"true\" />' or '/// <reference lib=\"dom\" />') are not allowed. Instead instruct the user of your package to specify these directives. {specifier}:{line}:{column}")]
   BannedTripleSlashDirectives {
     specifier: String,
     line: usize,
     column: usize,
   },
 
+  #[error("import assertions are not allowed, use import attributes instead (replace 'assert' with 'with') {specifier}:{line}:{column}")]
+  BannedImportAssertion {
+    specifier: String,
+    line: usize,
+    column: usize,
+  },
+
   #[error(
     "file at path '{path}' too large, max size is {max_size}, got {size}"
   )]
@@ -614,6 +621,9 @@ impl PublishError {
       PublishError::BannedTripleSlashDirectives { .. } => {
         Some("bannedTripleSlashDirectives")
       }
+      PublishError::BannedImportAssertion { .. } => {
+        Some("bannedImportAssertion")
+      }
       PublishError::InvalidExternalImport { .. } => {
         Some("invalidExternalImport")
       }

api/testdata/tarballs/import_assertions/data.json

@@ -0,0 +1 @@
+"abc"

api/testdata/tarballs/import_assertions/jsr.json

@@ -0,0 +1,5 @@
+{
+  "name": "@scope/foo",
+  "version": "1.2.3",
+  "exports": "./mod.ts"
+}

api/testdata/tarballs/import_assertions/mod.ts

@@ -0,0 +1 @@
+import "./data.json" assert { type: "json" };

api/testdata/tarballs/import_attributes/data.json

@@ -0,0 +1 @@
+"abc"

api/testdata/tarballs/import_attributes/jsr.json

@@ -0,0 +1,5 @@
+{
+  "name": "@scope/foo",
+  "version": "1.2.3",
+  "exports": "./mod.ts"
+}

api/testdata/tarballs/import_attributes/mod.ts

@@ -0,0 +1 @@
+import "./data.json" with { type: "json" };

frontend/docs/troubleshooting.md

@@ -105,6 +105,17 @@ allowed by JSR. JSR only allows triple slash directives that are
 
 You can fix this error by removing the triple slash directive from your source.
 
+### `bannedImportAssertion`
+
+The package being published contains the legacy "import assertions" syntax,
+which is not allowed by JSR. JSR only allows the new "import attributes" syntax.
+
+`import "./data.json" assert { type: "json" };` is not allowed.
+`import "./data.json" with { type: "json" };` is allowed.
+
+You can fix this error by updating the import assertion to an import attribute,
+by replacing `assert` with `with`.
+
 ### `fileTooLarge`
 
 The package being published contains a file that is too large. JSR only allows