Fund: Add option to disable ES transforms in `sucrase`

Add option to disable ES transforms in sucrase

#1087

@Mrtenz

10 months ago

👍

tsup uses sucrase to transpile ESM to CJS when code splitting is enabled:

tsup/src/plugins/cjs-splitting.ts

Lines 21 to 31 in 83c7c7f

    
           const { transform } = await import('sucrase') 
        
           const result = transform(code, { 
        
             filePath: info.path, 
        
             transforms: ['imports'], 
        
             sourceMapOptions: this.options.sourcemap 
        
               ? { 
        
                   compiledFilename: info.path, 
        
                 } 
        
               : undefined, 
        
           })

Unfortunately there is no way right now to specify the settings for sucrase. In our case, we wanted to disable the optional chaining polyfill that sucrase adds, since it's problematic for static analysis. The only way to do so seems to be by setting disableESTransforms: true in the options. It would be great if tsup had an option to set this.

EGOIST/tsup

Add option to disable ES transforms in sucrase

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	const { transform } = await import('sucrase')

	const result = transform(code, {
	filePath: info.path,
	transforms: ['imports'],
	sourceMapOptions: this.options.sourcemap
	? {
	compiledFilename: info.path,
	}
	: undefined,
	})

EGOIST/tsup

Add option to disable ES transforms in sucrase

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