feat(53656): Add support for the updated import attributes proposal

src/compiler/diagnosticMessages.json

@@ -19,6 +19,10 @@
         "category": "Error",
         "code": 1007
     },
+    "The 'assert' keyword in import attributes is deprecated and has been replaced by the 'with' keyword.": {
+        "category": "Error",
+        "code": 1008
+    },
     "Trailing comma not allowed.": {
         "category": "Error",
         "code": 1009
@@ -1472,7 +1476,7 @@
         "category": "Message",
         "code": 1449
     },
-    "Dynamic imports can only accept a module specifier and an optional assertion as arguments": {
+    "Dynamic imports can only accept a module specifier and an optional set of attributes as arguments": {
         "category": "Message",
         "code": 1450
     },
@@ -1520,6 +1524,18 @@
         "category": "Message",
         "code": 1461
     },
+    "'resolution-mode' attribute are only supported when `moduleResolution` is `node16` or `nodenext`.": {
+        "category": "Error",
+        "code": 1462
+    },
+    "`resolution-mode` is the only valid key for type import attributes.": {
+        "category": "Error",
+        "code": 1463
+    },
+    "Type import attributes should have exactly one key - `resolution-mode` - with value `import` or `require`.": {
+        "category": "Error",
+        "code": 1464
+    },
 
     "The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.": {
         "category": "Error",
@@ -1625,6 +1641,10 @@
         "category": "Error",
         "code": 1495
     },
+    "Identifier, string literal or number literal expected.": {
+        "category": "Error",
+        "code": 1496
+    },
 
     "The types of '{0}' are incompatible between these types.": {
         "category": "Error",
@@ -3579,6 +3599,10 @@
         "category": "Error",
         "code": 2822
     },
+    "Import attributes are only supported when the '--module' option is set to 'esnext' or 'nodenext'.": {
+        "category": "Error",
+        "code": 2823
+    },
     "Cannot find namespace '{0}'. Did you mean '{1}'?": {
         "category": "Error",
         "code": 2833
@@ -3611,10 +3635,6 @@
         "category": "Error",
         "code": 2840
     },
-    "The type of this expression cannot be named without a 'resolution-mode' assertion, which is an unstable feature. Use nightly TypeScript to silence this error. Try updating with 'npm install -D typescript@next'.": {
-        "category": "Error",
-        "code": 2841
-    },
     "'{0}' is an unused renaming of '{1}'. Did you intend to use it as a type annotation?": {
         "category": "Error",
         "code": 2842
@@ -3663,6 +3683,18 @@
         "category": "Error",
         "code": 2854
     },
+    "Import attributes are not allowed on statements that transpile to CommonJS 'require' calls.": {
+        "category": "Error",
+        "code": 2855
+    },
+    "Import attributes cannot be used with type-only imports or exports.": {
+        "category": "Error",
+        "code": 2856
+    },
+    "Import attribute values must be string literal expressions.": {
+        "category": "Error",
+        "code": 2857
+    },
 
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",
@@ -4096,10 +4128,6 @@
         "category": "Error",
         "code": 4124
     },
-    "'resolution-mode' assertions are unstable. Use nightly TypeScript to silence this error. Try updating with 'npm install -D typescript@next'.": {
-        "category": "Error",
-        "code": 4125
-    },
 
     "The current host does not support the '{0}' option.": {
         "category": "Error",

src/compiler/emitter.ts

@@ -7,8 +7,6 @@ import {
     ArrayTypeNode,
     ArrowFunction,
     AsExpression,
-    AssertClause,
-    AssertEntry,
     AwaitExpression,
     base64encode,
     BigIntLiteral,
@@ -191,6 +189,8 @@ import {
     Identifier,
     idText,
     IfStatement,
+    ImportAttribute,
+    ImportAttributes,
     ImportClause,
     ImportDeclaration,
     ImportEqualsDeclaration,
@@ -2053,10 +2053,10 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
                     return emitNamedExports(node as NamedExports);
                 case SyntaxKind.ExportSpecifier:
                     return emitExportSpecifier(node as ExportSpecifier);
-                case SyntaxKind.AssertClause:
-                    return emitAssertClause(node as AssertClause);
-                case SyntaxKind.AssertEntry:
-                    return emitAssertEntry(node as AssertEntry);
+                case SyntaxKind.ImportAttributes:
+                    return emitImportAttributes(node as ImportAttributes);
+                case SyntaxKind.ImportAttribute:
+                    return emitImportAttribute(node as ImportAttribute);
                 case SyntaxKind.MissingDeclaration:
                     return;
 
@@ -2946,16 +2946,16 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
         writeKeyword("import");
         writePunctuation("(");
         emit(node.argument);
-        if (node.assertions) {
+        if (node.attributes) {
             writePunctuation(",");
             writeSpace();
             writePunctuation("{");
             writeSpace();
-            writeKeyword("assert");
+            writeKeyword(node.attributes.attributes.token === SyntaxKind.AssertKeyword ? "assert" : "with");
             writePunctuation(":");
             writeSpace();
-            const elements = node.assertions.assertClause.elements;
-            emitList(node.assertions.assertClause, elements, ListFormat.ImportClauseEntries);
+            const elements = node.attributes.attributes.elements;
+            emitList(node.attributes.attributes, elements, ListFormat.ImportAttributes);
             writeSpace();
             writePunctuation("}");
         }
@@ -3990,8 +3990,8 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
             writeSpace();
         }
         emitExpression(node.moduleSpecifier);
-        if (node.assertClause) {
-            emitWithLeadingSpace(node.assertClause);
+        if (node.attributes) {
+            emitWithLeadingSpace(node.attributes);
         }
         writeTrailingSemicolon();
     }
@@ -4065,20 +4065,20 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
             writeSpace();
             emitExpression(node.moduleSpecifier);
         }
-        if (node.assertClause) {
-            emitWithLeadingSpace(node.assertClause);
+        if (node.attributes) {
+            emitWithLeadingSpace(node.attributes);
         }
         writeTrailingSemicolon();
     }
 
-    function emitAssertClause(node: AssertClause) {
-        emitTokenWithComment(SyntaxKind.AssertKeyword, node.pos, writeKeyword, node);
+    function emitImportAttributes(node: ImportAttributes) {
+        emitTokenWithComment(node.token, node.pos, writeKeyword, node);
         writeSpace();
         const elements = node.elements;
-        emitList(node, elements, ListFormat.ImportClauseEntries);
+        emitList(node, elements, ListFormat.ImportAttributes);
     }
 
-    function emitAssertEntry(node: AssertEntry) {
+    function emitImportAttribute(node: ImportAttribute) {
         emit(node.name);
         writePunctuation(":");
         writeSpace();