refactor(ast)!: remove ExportDefaultDeclaration exported field#12808
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…12808) We currently store the `default` keyword for `ExportDefaultDeclaration` as a `ModuleExportName`. This is overkill because the name is always, by definition, `default`. The only place the `Span` of `default` keyword is used is in `ModuleRecordBuilder`. So essentially storing the span in AST is using the AST as temporary storage - it's only put there so that `ModuleRecordBuilder` can pull it out again. After #12807, we can just pass the span direct to `ModuleRecordBuilder`, and so remove the need for it to be in the AST at all. So we can remove the whole field. This reduces size of `ExportDefaultDeclaration` from 80 bytes to 24. That has very limited impact, because each file can only have 1 `export default` statement. But still... less is more! It also removes erroneous code in both isolated declarations and transformer, which both just gave the keyword an empty span. I think the fact that everywhere that does use this field uses it wrongly is good justification for its removal! (alternative to #12803)
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…xc-project#12808) We currently store the `default` keyword for `ExportDefaultDeclaration` as a `ModuleExportName`. This is overkill because the name is always, by definition, `default`. The only place the `Span` of `default` keyword is used is in `ModuleRecordBuilder`. So essentially storing the span in AST is using the AST as temporary storage - it's only put there so that `ModuleRecordBuilder` can pull it out again. After oxc-project#12807, we can just pass the span direct to `ModuleRecordBuilder`, and so remove the need for it to be in the AST at all. So we can remove the whole field. This reduces size of `ExportDefaultDeclaration` from 80 bytes to 24. That has very limited impact, because each file can only have 1 `export default` statement. But still... less is more! It also removes erroneous code in both isolated declarations and transformer, which both just gave the keyword an empty span. I think the fact that everywhere that does use this field uses it wrongly is good justification for its removal! (alternative to oxc-project#12803)
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We currently store the
defaultkeyword forExportDefaultDeclarationas aModuleExportName. This is overkill because the name is always, by definition,default.The only place the
Spanofdefaultkeyword is used is inModuleRecordBuilder. So essentially storing the span in AST is using the AST as temporary storage - it's only put there so thatModuleRecordBuildercan pull it out again.After #12807, we can just pass the span direct to
ModuleRecordBuilder, and so remove the need for it to be in the AST at all.So we can remove the whole field.
This reduces size of
ExportDefaultDeclarationfrom 80 bytes to 24. That has very limited impact, because each file can only have 1export defaultstatement. But still... less is more!It also removes erroneous code in both isolated declarations and transformer, which both just gave the keyword an empty span. I think the fact that everywhere that does use this field uses it wrongly is good justification for its removal!
(alternative to #12803)