mypy: add lcovreport.py

Author: nedbat

coverage/lcovreport.py

@@ -3,24 +3,34 @@
 
 """LCOV reporting for coverage.py."""
 
+from __future__ import annotations
+
 import sys
 import base64
 from hashlib import md5
 
+from typing import IO, Iterable, Optional, TYPE_CHECKING
+
+from coverage.plugin import FileReporter
 from coverage.report import get_analysis_to_report
 from coverage.results import Analysis, Numbers
+from coverage.types import TMorf
+
+if TYPE_CHECKING:
+    from coverage import Coverage
+    from coverage.data import CoverageData
 
 
 class LcovReporter:
     """A reporter for writing LCOV coverage reports."""
 
     report_type = "LCOV report"
 
-    def __init__(self, coverage):
+    def __init__(self, coverage: Coverage) -> None:
         self.coverage = coverage
         self.total = Numbers(self.coverage.config.precision)
 
-    def report(self, morfs, outfile=None):
+    def report(self, morfs: Optional[Iterable[TMorf]], outfile: IO[str]) -> float:
         """Renders the full lcov report.
 
         'morfs' is a list of modules or filenames
@@ -36,7 +46,7 @@ def report(self, morfs, outfile=None):
 
         return self.total.n_statements and self.total.pc_covered
 
-    def get_lcov(self, fr, analysis, outfile=None):
+    def get_lcov(self, fr: FileReporter, analysis: Analysis, outfile: IO[str]) -> None:
         """Produces the lcov data for a single file.
 
         This currently supports both line and branch coverage,

tox.ini

@@ -97,7 +97,7 @@ setenv =
     {[testenv]setenv}
     C__B=coverage/__init__.py coverage/__main__.py coverage/annotate.py coverage/bytecode.py
     C_CE=coverage/config.py coverage/context.py coverage/control.py coverage/data.py coverage/disposition.py coverage/exceptions.py
-    C_FN=coverage/files.py coverage/inorout.py coverage/jsonreport.py coverage/multiproc.py coverage/numbits.py
+    C_FN=coverage/files.py coverage/inorout.py coverage/jsonreport.py coverage/lcovreport.py coverage/multiproc.py coverage/numbits.py
     C_OP=coverage/parser.py coverage/phystokens.py coverage/plugin.py coverage/python.py
     C_QZ=coverage/report.py coverage/results.py coverage/sqldata.py coverage/tomlconfig.py coverage/types.py coverage/version.py
     T_AN=tests/test_api.py tests/goldtest.py tests/helpers.py tests/test_html.py