Fix lints for wasm libraries

.flake8

@@ -0,0 +1,3 @@
+[flake8]
+# black's line length
+max-line-length = 88

wasm/lib/Lib/_microdistlib.py

@@ -1,4 +1,6 @@
 # taken from https://bitbucket.org/pypa/distlib/src/master/distlib/util.py
+# flake8: noqa
+# fmt: off
 
 from types import SimpleNamespace as Container
 import re

wasm/lib/Lib/asyncweb.py

@@ -1,6 +1,5 @@
 from _js import Promise
-from collections.abc import Coroutine, Awaitable
-from abc import ABC, abstractmethod
+from collections.abc import Coroutine
 
 try:
     import browser
@@ -61,9 +60,11 @@ def main(async_func):
 async def _main_wrapper(coro):
     try:
         await coro
-    except:
-        import traceback, sys
+    except:  # noqa: E722
+        import traceback
+        import sys
 
+        # TODO: sys.stderr on wasm
         traceback.print_exc(file=sys.stdout)
 
 
@@ -198,7 +199,7 @@ if browser:
     _settimeout = browser.window.get_prop("setTimeout")
 
     def timeout(ms):
-        prom = asyncweb.CallbackPromise()
+        prom = CallbackPromise()
 
         @browser.jsclosure_once
         def cb(this):

wasm/lib/Lib/browser.py

@@ -1,14 +1,44 @@
-from _browser import *
+from _browser import (
+    fetch,
+    request_animation_frame,
+    cancel_animation_frame,
+    Document,
+    Element,
+    load_module,
+)
 
 from _js import JSValue, Promise
 from _window import window
 
+__all__ = [
+    "jsstr",
+    "jsclosure",
+    "jsclosure_once",
+    "jsfloat",
+    "NULL",
+    "UNDEFINED",
+    "alert",
+    "confirm",
+    "prompt",
+    "fetch",
+    "request_animation_frame",
+    "cancel_animation_frame",
+    "Document",
+    "Element",
+    "load_module",
+    "JSValue",
+    "Promise",
+]
+
 
 jsstr = window.new_from_str
 jsclosure = window.new_closure
 jsclosure_once = window.new_closure_once
 _jsfloat = window.new_from_float
 
+UNDEFINED = window.undefined()
+NULL = window.null()
+
 
 def jsfloat(n):
     return _jsfloat(float(n))
@@ -41,4 +71,6 @@ def prompt(msg, default_val=None):
     if default_val is not None and type(default_val) != str:
         raise TypeError("default_val must be a string")
 
-    return _prompt.call(*(jsstr(arg) for arg in [msg, default_val] if arg)).as_str()
+    return _prompt.call(
+        jsstr(msg), jsstr(default_val) if default_val else UNDEFINED
+    ).as_str()

wasm/lib/Lib/whlimport.py

@@ -3,7 +3,8 @@ import zipfile
 import asyncweb
 import io
 import re
-from urllib.parse import urlparse, unquote
+import posixpath
+from urllib.parse import urlparse
 import _frozen_importlib as _bootstrap
 import _microdistlib
 
@@ -74,7 +75,7 @@ async def _load_info_pypi(pkg):
     try:
         dl = next(dl for dl in ver_downloads if dl["packagetype"] == "bdist_wheel")
     except StopIteration:
-        raise ValueError(f"no wheel available for package {Name!r} {ver}")
+        raise ValueError(f"no wheel available for package {name!r} {ver}")
     return (
         name,
         dl["filename"],
@@ -124,11 +125,11 @@ class ZipFinder:
 
     @classmethod
     def _get_source(cls, spec):
-        origin = spec.origin
-        if not origin or not origin.startswith("zip:"):
-            raise ImportError(f"{module.__spec__.name!r} is not a zip module")
+        origin = spec.origin and remove_prefix(spec.origin, "zip:")
+        if not origin:
+            raise ImportError(f"{spec.name!r} is not a zip module")
 
-        zipname, slash, path = origin[len("zip:") :].partition("/")
+        zipname, slash, path = origin.partition("/")
         return cls._packages[zipname].read(path).decode()
 
     @classmethod
@@ -141,6 +142,13 @@ class ZipFinder:
         _bootstrap._call_with_frames_removed(exec, code, module.__dict__)
 
 
+def remove_prefix(s, prefix):
+    if s.startswith(prefix):
+        return s[len(prefix) :]  # noqa: E203
+    else:
+        return None
+
+
 _zip_searchorder = (
     ("/__init__.pyc", True, True),
     ("/__init__.py", False, True),