Support Next.js v9#11

Merged

treetips merged 5 commits intomasterfrom

feature/support_v9

Jul 8, 2019

Commits on Jul 8, 2019

refactor: update next.js and remove external @types/next
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feat: add auto-generated files
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refactor: replace new @types
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refactor: replace unuse variables to underscore
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refactor: change props type from interface to type
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