Chrome DevTools won't let me set breakpoints on certain lines

Question

In the image above, I tried setting breakpoints on every line from line 437 to line 443. However, I cannot set breakpoints on lines 439 and 440. When the function runs,

Answer 1

This recently became an issue for me, running System.js and Babel, and with plain ES6 transpiling, I haven't gotten to minifying/mapping yet. A workaround seems to be to add your breakpoint to the !transpiled file, a matching breakpoint will automagically appear in the corresponding line in the raw file.