Joe Haddad 55369051f5 Warn build on duplicate pages (#8646) ... * Fail build on duplicate pages This will fail the `next build` command when a duplicate page is found. In development, we'll emit a warning instead of crashing the dev server. * Add test for warning in development * Only issue a warning * Fix production test * Fix development test * Remove useless arg * Warn in development, too		2019-09-11 14:26:10 -04:00
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pages	Warn build on duplicate pages (#8646)	2019-09-11 14:26:10 -04:00
test	Warn build on duplicate pages (#8646)	2019-09-11 14:26:10 -04:00