[WIP] TypeScript Parser (#915)

* WIP immediate feedback

* typescript parser is drop-in replacement for flow parser

* Add new TypeScript Parser snapshots where drop-in replacement possible

* Snapshot updates after rebasing

* Remove unnecessary stripping of properties on TypeScript parser AST

* Remove annotated issues

* Move TS dependencies to dev for now

tests/array_spread/__snapshots__/jsfmt.spec.js.snap

@@ -8,3 +8,12 @@ exports[`multiple.js 1`] = `
 [...a, ...b];
 "
 `;
+
+exports[`multiple.js 2`] = `
+"[...a, ...b,];
+[...a, ...b];
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+[...a, ...b];
+[...a, ...b];
+"
+`;

tests/array_spread/jsfmt.spec.js

@@ -1 +1,2 @@
 run_spec(__dirname);
+run_spec(__dirname, {parser: 'typescript'});