Identifiers are reused within the same module

[haykam821]

Applying source maps naively seems to have the side effect of introducing redeclaration within a single module. For example, the src/reddit/pages/Recap/index.tsx module contains the following code:

const RECAP_CARD = "PersonalizedYearInReviewCommentCard",
	RECAP_CARD = "PersonalizedYearInReviewEndCard",
	RECAP_CARD = "PersonalizedYearInReviewGenericCard",
	RECAP_CARD = "PersonalizedYearInReviewIntroCard",
	RECAP_CARD = "PersonalizedYearInReviewPostCard",
	RECAP_CARD = "PersonalizedYearInReviewShareCard",
	RECAP_CARD = "PersonalizedYearInReviewSubredditCard",
	RECAP_CARD = "PersonalizedYearInReviewSubredditListCard",
	RECAP_CARD = "PersonalizedYearInReviewSingleStatSubredditListCard",
	RECAP_CARD = "PersonalizedYearInReviewAvatarCard",
	RECAP_CARD = "PersonalizedYearInReviewTopicListCard",
	RECAP_CARD = "PersonalizedYearInReviewRPlaceTileListCard",
	RECAP_CARD = "PersonalizedYearInReviewSingleTopicCard",
	isPersonalizedYearInReviewShareCard = card => card.__typename === RECAP_CARD;

The mappings in question seem to come from multiple sources. The source map for the bundle mentions multiple sources that don't correspond to modules within the bundle:

{
	"sources": [
		// ...
		"webpack:///./src/reddit/pages/Recap/CardTemplates/CommentCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/EndCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/GenericCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/IntroCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/PostCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/RplaceCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/ShareCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/SingleStatSubredditListCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/SingleTopicCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/SubredditCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/SubredditListCard.tsx",
		"webpack:///./src/reddit/pages/Recap/CardTemplates/TopicListCard.tsx",
		// ...
	]
}

The redeclaration should be avoided in some way, such as by introducing modules based on source maps in addition to the Webpack module structure or by suffixing conflicting names.