fix(gatsby-link): provide fallback for __BASE_PATH__ being missing #13839
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Description
This fixes a regression identified by the inimitable @m-allanson--specifically that
__BASE_PATH__
won't be defined in older versions of gatsby, and older versions of gatsby use a^
for dependencies, therefore they'd be using this version.This would have been remediated with a lockfile, but nice not to break anyone needlessly.
As such--this introduces a guard using
typeof
to detect the existence of__BASE_PATH__
. If it's not defined, it'll fallback to the "legacy"__PATH_PREFIX__
.Related Issues
Fixes #13836