pytype: add coverage for parts of hgext

There are tons of things to fix here (which have been blacklisted for now), but
this should help prevent further regressions.

contrib/check-pytype.sh

@@ -12,6 +12,36 b' cd `hg root`'
 # endeavor to empty this list out over time, as some of these are
 # probably hiding real problems.
 #
+# hgext/absorb.py               # [attribute-error]
+# hgext/bugzilla.py             # [pyi-error], [attribute-error]
+# hgext/convert/bzr.py          # [attribute-error]
+# hgext/convert/cvs.py          # [attribute-error], [wrong-arg-types]
+# hgext/convert/cvsps.py        # [attribute-error]
+# hgext/convert/p4.py           # [wrong-arg-types] (__file: mercurial.utils.procutil._pfile -> IO)
+# hgext/convert/subversion.py   # [attribute-error], [name-error], [pyi-error]
+# hgext/fastannotate/context.py # no linelog.copyfrom()
+# hgext/fastannotate/formatter.py  # [unsupported-operands]
+# hgext/fsmonitor/__init__.py   # [name-error]
+# hgext/git/__init__.py         # [attribute-error]
+# hgext/githelp.py              # [attribute-error] [wrong-arg-types]
+# hgext/hgk.py                  # [attribute-error]
+# hgext/histedit.py             # [attribute-error], [wrong-arg-types]
+# hgext/infinitepush            # using bytes for str literal; scheduled for removal
+# hgext/keyword.py              # [attribute-error]
+# hgext/largefiles/storefactory.py  # [attribute-error]
+# hgext/lfs/__init__.py         # [attribute-error]
+# hgext/narrow/narrowbundle2.py # [attribute-error]
+# hgext/narrow/narrowcommands.py    # [attribute-error], [name-error]
+# hgext/rebase.py               # [attribute-error]
+# hgext/remotefilelog/basepack.py   # [attribute-error], [wrong-arg-count]
+# hgext/remotefilelog/basestore.py  # [attribute-error]
+# hgext/remotefilelog/contentstore.py   # [missing-parameter], [wrong-keyword-args], [attribute-error]
+# hgext/remotefilelog/fileserverclient.py  # [attribute-error]
+# hgext/remotefilelog/shallowbundle.py     # [attribute-error]
+# hgext/remotefilelog/remotefilectx.py  # [module-attr] (This is an actual bug)
+# hgext/sqlitestore.py          # [attribute-error]
+# hgext/zeroconf/__init__.py    # bytes vs str; tests fail on macOS
+#
 # mercurial/bundlerepo.py       # no vfs and ui attrs on bundlerepo
 # mercurial/context.py          # many [attribute-error]
 # mercurial/crecord.py          # tons of [attribute-error], [module-attr]
@@ -42,7 +72,37 b' cd `hg root`'
 
 # TODO: include hgext and hgext3rd
 
-pytype -V 3.7 --keep-going --jobs auto doc/check-seclevel.py hgdemandimport mercurial \
+pytype -V 3.7 --keep-going --jobs auto \
+    doc/check-seclevel.py hgdemandimport hgext mercurial \
+    -x hgext/absorb.py \
+    -x hgext/bugzilla.py \
+    -x hgext/convert/bzr.py \
+    -x hgext/convert/cvs.py \
+    -x hgext/convert/cvsps.py \
+    -x hgext/convert/p4.py \
+    -x hgext/convert/subversion.py \
+    -x hgext/fastannotate/context.py \
+    -x hgext/fastannotate/formatter.py \
+    -x hgext/fsmonitor/__init__.py \
+    -x hgext/git/__init__.py \
+    -x hgext/githelp.py \
+    -x hgext/hgk.py \
+    -x hgext/histedit.py \
+    -x hgext/infinitepush \
+    -x hgext/keyword.py \
+    -x hgext/largefiles/storefactory.py \
+    -x hgext/lfs/__init__.py \
+    -x hgext/narrow/narrowbundle2.py \
+    -x hgext/narrow/narrowcommands.py \
+    -x hgext/rebase.py \
+    -x hgext/remotefilelog/basepack.py \
+    -x hgext/remotefilelog/basestore.py \
+    -x hgext/remotefilelog/contentstore.py \
+    -x hgext/remotefilelog/fileserverclient.py \
+    -x hgext/remotefilelog/remotefilectx.py \
+    -x hgext/remotefilelog/shallowbundle.py \
+    -x hgext/sqlitestore.py \
+    -x hgext/zeroconf/__init__.py \
     -x mercurial/bundlerepo.py \
     -x mercurial/context.py \
     -x mercurial/crecord.py \