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ES6 modules go in...
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output.format
es
amd
cjs
iife
umd
system
add option
context
experimentalLogSideEffects
output.banner
output.chunkFileNames
output.compact
output.entryFileNames
output.experimentalMinChunkSize
output.freeze
output.footer
output.generatedCode.arrowFunctions
output.generatedCode.constBindings
output.generatedCode.objectShorthand
output.generatedCode.preset
output.generatedCode.reservedNamesAsProps
output.generatedCode.symbols
output.hashCharacters
output.hoistTransitiveImports
output.importAttributesKey
output.inlineDynamicImports
output.intro
output.minifyInternalExports
output.outro
output.preserveModules
output.sourcemap
output.sourcemapFileNames
output.sanitizeFileName
output.validate
preserveEntrySignatures
shimMissingExports
treeshake
treeshake.annotations
treeshake.correctVarValueBeforeDeclaration
treeshake.moduleSideEffects
treeshake.preset
treeshake.propertyReadSideEffects
treeshake.tryCatchDeoptimization
treeshake.unknownGlobalSideEffects
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