git submodule of blockly with typescript

[yixin]

Hello, I used blockly from npm and the typescript works fine, and now I use blockly from git submodule, then the `import Blockly from 'blockly/core'` throw ts error that 'cannot find module “blockly/core”'. I tried relative path to import blockly: `import Blockly from 'path/to/blockly/core` but still same error. Anyone know how to config the typescript?