[oden] Explain myself.

README.md

@@ -44,3 +44,25 @@ See above about being abandoned: we have small patches in place to e.g. expose i
 #### My Own Bindings
 
 The other bindings are maddeningly incomplete, and don't expose features I want to expose out of QuickJS.
+
+### TypeScript
+
+I'm using `deno_ast` to parse typescript at load time and "transpile" to javascript before loading.
+`deno_ast` is built on swc, which I really really don't like very much, but my other options are:
+
+1. Actually use the typescript compiler.
+   This is a neat idea but involves loading the compiler into QuickJS (which requires some patches to tsc since qjs is not node).
+   Also the typescript compiler is SLOW (especially when run in QJS) and finicky.
+   But this would be a full-fidelity option for sure.
+
+2. Use tree-sitter to parse the typescript and strip the types out myself.
+   The tree-sitter parser is fast and gives me everything with full fidelity.
+   This *also* has the nice side-effect of letting me edit the source file in place, so source maps aren't a problem.
+   The downside is that finding every part of TS that has to be cut out to make JS is time consuming and error prone and I don't want to do it, particularly.
+
+3. Parse Typescript myself.
+   I can write a parser, sure, doesn't bother me, but the syntax for typescript is not formally documented anywhere.
+   And it has the same problem as #2 when it comes time to emit JS.
+
+So for now, I stick with `deno_ast`.
+It does what I need it to do.