add base 64

Author: alexpantyukhin

src/Fable.Python.fsproj

@@ -13,6 +13,7 @@
     <Compile Include="stdlib/Builtins.fs" />
     <Compile Include="stdlib/Json.fs" />
     <Compile Include="stdlib/Html.fs" />
+    <Compile Include="stdlib/Base64.fs" />
     <Compile Include="stdlib/Math.fs" />
     <Compile Include="stdlib/Os.fs" />
     <Compile Include="stdlib/Queue.fs" />

src/stdlib/Base64.fs

@@ -0,0 +1,31 @@
+module Fable.Python.Base64
+
+open Fable.Core
+
+// fsharplint:disable MemberNames
+
+type IExports =
+    abstract b64encode : byte[] -> byte[]
+    abstract b64encode : s : byte[] * altchars: byte[] -> byte[]
+
+    abstract b64decode : byte[] -> byte[]
+    abstract b64decode : string -> byte[]
+    abstract b64decode : s: byte[] * altchars : byte[] -> byte[]
+    abstract b64decode : s: string * altchars : byte[] -> byte[]
+    abstract b64decode : s: byte[] * altchars : byte[] * validate: bool -> byte[]
+    abstract b64decode : s: string * altchars : byte[] * validate: bool -> byte[]
+    abstract b64decode : s: byte[] * validate: bool -> byte[]
+    abstract b64decode : s: string * validate: bool -> byte[]
+
+    abstract standard_b64encode : byte[] -> byte[]
+    abstract standard_b64decode : string -> byte[]
+    abstract standard_b64decode : byte[] -> byte[]
+    abstract urlsafe_b64encode : byte[] -> byte[]
+    abstract urlsafe_b64decode : string -> byte[]
+    abstract urlsafe_b64decode : byte[] -> byte[]
+    abstract b32encode : byte[] -> byte[]
+    abstract b16encode : byte[] -> byte
+
+ /// Miscellaneous operating system interfaces
+[<ImportAll("base64")>]
+let base64: IExports = nativeOnly