# What changed in @babel/template

> 23 changes in @babel/template 8 from its official release notes, upgrade guides and advisories: 17 breaking, 1 deprecations, 3 new APIs and options. Each one cited. Sources checked 2026-10-23. HTML: https://unstale.sh/npm/@babel/template/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## @babel/template 8

### Breaking changes

- The package is now shipped as a native ECMAScript module, affecting how developers load it. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration)
- Importing internal files is disallowed; use the exported API instead. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- BigIntLiteral.value is now a bigint rather than a string, aligning with NumericLiteral; JSON serialization requires a custom bigint serializer. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- Dynamic import() is represented by an ImportExpression node with source and options fields instead of a CallExpression. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- Babel 8 packages require Node.js ^22.18.0 or >=24.11.0; older Node.js versions cannot run Babel. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration)
- In TSCallSignatureDeclaration, TSConstructSignatureDeclaration, TSFunctionType, TSConstructorType, and TSMethodSignature, parameters is renamed to params. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- The field is renamed to superTypeArguments in ClassDeclaration and ClassExpression. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- Enum members are now wrapped in a TSEnumBody node under the declaration's body field. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- This node is replaced by TSClassImplements or TSInterfaceHeritage; the new nodes use typeArguments, and qualified expressions are represented as MemberExpression. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- An exported TSImportEqualsDeclaration is now wrapped in an ExportNamedDeclaration; its isExport field is removed. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- The argument field is renamed to source. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- The typeParameter property is flattened into key and constraint properties on TS MappedType nodes. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- A dotted namespace name such as X.Y is represented by a single TSModuleDeclaration whose name is a TSQualifiedName, rather than nested declarations. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- Interpolated template literal types now produce TSTemplateLiteralType nodes; template literal types without interpolations retain their existing AST shape. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- TSTypeParameter.name is now an Identifier node rather than a plain string. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- In TSCallSignatureDeclaration, TSConstructSignatureDeclaration, TSFunctionType, TSConstructorType, and TSMethodSignature, typeAnnotation is renamed to returnType. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- The field is renamed to typeArguments in CallExpression, JSXOpeningElement, NewExpression, OptionalCallExpression, TSImportType, TSInstantiationExpression, TSTypeQuery, and TSTypeReference. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)

### Deprecations

- The legacy import() AST can be requested with this parser option set to false, but it is deprecated and will be removed in Babel 9. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)

### New APIs and options

- When enabled, this option only allows top-level super, including for constructing super nodes in Babel templates. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration)
- When both estree and typescript parser plugins are enabled, Babel creates TSAbstractMethodDefinition nodes. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)
- When both estree and typescript parser plugins are enabled, Babel creates TSPropertyDefinition nodes. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)

### Behavior and default changes

- TSParenthesizedType is generated only when this parser option is enabled; otherwise parentheses can be detected through node.extra.parenthesized. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)

### Fixes and other changes

- TSTypeQuery.exprName can now be a ThisExpression for typeof this, rather than an Identifier named this. (8.0.0) — [upgrade guide](https://babel.dev/docs/v8-migration-api)