refactor: cleanup compiler pipeline (#2686)

* remove fetch_source_file_and_maybe_compile_async and 
  replace it with State.fetch_compiled_module

* remove SourceFile.js_source()

* introduce CompiledModule which is basically the same as
  deno::SourceInfo and represents arbitrary file that has been 
  compiled to JS module

* introduce //cli/compilers module containing all compilers

* introduce JsCompiler which is a no-op compiler
  - output is the same as input, no compilation takes place
  - it is used for MediaType::JavaScript and MediaType::Unknown

* introduce JsonCompiler that wraps JSON in default export

* support JS-to-JS compilation using checkJs

1 files changed, 4 insertions, 0 deletions

diff --git a/cli/disk_cache.rs b/cli/disk_cache.rs
index 808cfe675..fdbe2cbd5 100644
--- a/cli/disk_cache.rs
+++ b/cli/disk_cache.rs
@@ -18,6 +18,10 @@ impl DiskCache {
     }
   }
 
+  // TODO(bartlomieju) this method is not working properly for Windows paths,
+  // Example: file:///C:/deno/js/unit_test_runner.ts
+  // would produce: C:deno\\js\\unit_test_runner.ts
+  // it should produce: file\deno\js\unit_test_runner.ts
   pub fn get_cache_filename(self: &Self, url: &Url) -> PathBuf {
     let mut out = PathBuf::new();