It's hard to imagine the slowness isn't outweighed by the speed gains from Intellisense and automatic refactoring tools. with Webstorm / IntelliJ you can write

It's hard to imagine the slowness isn't outweighed by the speed gains from Intellisense and automatic refactoring tools. with Webstorm / IntelliJ you can write first using placeholder variable names in a single file. One click to rename the variable and all references throughout the app. Drag the file to a different folder and imports are fixed everywhere. Want to move a single function to a different file? One click or keyboard shortcut and you're there.