Did you do changes in the blockly core? Then update the typings
cd blockly
npm run typings
the last will only work if you did once sudo apt install npm to install npm, and if you installed dependencies in the blockly directory:
npm install
To build blockly again
npm run build
the last will only work if you installed gulp
sudo npm install gulp-cli -g
npm install gulp
You want to update to latest upstream blockly? Then do the following
cd blockly
git remote add -f blockly https://github.com/google/blockly.git
git fetch blockly master
git subtree pull --prefix blockly blockly master
Now, fix all the merge errors, then commit. Remove the upstream afterward.
Do you changes, then build
cd blockly
npm run build
See package.json for other argumens for run. External dependencies must be given in directory externs.
Part of npm now, becomes available on npm install, no need to include in git ...
You need to annotate functions, see annotating Javascript