fix(typescript): fix plugin type declarations (#647)

Thomas Scholtes · web-flow · commit 181b929e5eb8 · 2021-01-29T09:14:30.000-05:00
We fix the type declaration file for the `typescript` plugin.

Signed-off-by: Thomas Scholtes &lt;thomas-scholtes@gmx.de&gt;
diff --git a/packages/typescript/types/index.d.ts b/packages/typescript/types/index.d.ts
@@ -38,7 +38,7 @@ export interface RollupTypescriptPluginOptions {
   transformers?: CustomTransformerFactories;
 }
 
-type ElementType<T extends Array<any>> = T extends (infer U)[] ? U : never;
+type ElementType<T extends Array<any> | undefined> = T extends (infer U)[] ? U : never;
 
 export type TransformerStage = keyof CustomTransformers;
 type StagedTransformerFactory<T extends TransformerStage> = ElementType<CustomTransformers[T]>;

Original file line number	Diff line number	Diff line change
`@@ -38,7 +38,7 @@ export interface RollupTypescriptPluginOptions {`
`38`	`38`	`transformers?: CustomTransformerFactories;`
`39`	`39`	`}`
`40`	`40`
`41`		`-type ElementType<T extends Array<any>> = T extends (infer U)[] ? U : never;`
	`41`	`+type ElementType<T extends Array<any> \| undefined> = T extends (infer U)[] ? U : never;`
`42`	`42`
`43`	`43`	`export type TransformerStage = keyof CustomTransformers;`
`44`	`44`	`type StagedTransformerFactory<T extends TransformerStage> = ElementType<CustomTransformers[T]>;`