I'm guessing you're looking at `flow-bin`, which was not the official way to get the Flow binary for a long time (nor was installing it per-project), because the underlying executable isn't JavaScript. It would be more accurate to measure `babel-preset-flow`: https://www.npmjs.com/package/babel-preset-flow (2M in the last month)
Good catch. I also couldn't get numbers for `brew install flow` - are these tracked somewhere?
They are! https://brew.sh/analytics/install/
- TypeScript: 4,745,783 downloads in the last month
- Flow: 889,612 downloads in the last month