Options

parserTs and parserTsx accept the same single option.

Option	Type	Default	Description
extension	Record<string, string>	{ '.ts': '' }	Rewrite the extensions emitted in import/export statements

extension

Rewrites the extensions emitted in import/export statements. Keys are the source extension, values the output, and '' drops it. Only the module-specifier string changes, never the on-disk filename.

Use it to emit .js imports from .ts sources for an ESM dual package, or to keep the source extension for Node16/NodeNext resolution.

Type:	Record<string, string>
Default:	{ '.ts': '' }

parserTs({ extension: { '.ts': '.js' } })  // import './api.js' instead of './api'
parserTs({ extension: { '.ts': '.ts' } })  // import './api.ts' instead of './api'