- An LSP-ish Playground where you can make see the response to specific calls - An English explainer which explains a complex TS type - Convert TS dts -> Flow interfaces(flowgen) - Run tutorials in the playground against live code as a learning tool - AST Viewer - ts-query runner - codemod runner - Highlight TS vs JS (or type vs value) parts of some code code - Show all used types in a file - Show dts files in the current workspace - Edit an ambient dts file