Inspired by YousefED/typescript-json-schema. Here's the differences list:

• this implementation does not use typeChecker.getTypeAtLocation() (so probably it keeps correct type aliases)
• the following features are not supported yet:
  • class types
  • conditional types
• processing AST and formatting JSON schema have been split into two independent steps
• not exported types, interfaces, enums are not exposed in the definitions section in the JSON schema

npm install typescript-to-json-schema
./node_modules/.bin/typescript-to-json-schema \
    --path 'my/project/**.*.ts' \
    --type 'My.Type.Full.Name' \
    --expose 'export' \
    --topRef 'yes' \
    --jsDoc 'extended'

• interface types
• enum types
• union, tuple, type[] types
• string, boolean, number types
• "value", 123, true, false, null, undefined literals
• type aliases
• generics
• typeof
• keyof

npm run debug -- test/programs/type-alias-single/main.ts --aliasRefs true MyString

And connect via the debugger protocol.

AST Explorer is amazing for developers of this tool!