gulp-watch uses chokidar which uses fsevents which is much better than fs polling or relying on fs.watch.
fsevents use only one FD per watch invocation as opposed to one FD per watched directory and any subdirectory.
this should improve the situation with EMFILE errors (caused by lack of available file descriptors)
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I also tried the following:
gulp-sane: requires watchman installation via brew so I didn't want to request that everyone goes throught that yet
gulp-chokidar: didn't work, seems to be obsolete
Special regexp tokens were allowed unchanged previously, which incorrectly broke
the include/exclude behaviour. Now, they're escaped first.
Closes#1721Closes#1752
By default, gulp-typescript currently depends on typescript 1.4, which doesn't work for us.
For example, it doesn't allow `let` when emitting ES5, along with lots of other errors.
It so happens that npm sometimes makes this work, as seen by the warning
```npm WARN unmet dependency /Users/alexeagle/Projects/angular/node_modules/gulp-typescript requires typescript@'1.4.1' but will load
npm WARN unmet dependency /Users/alexeagle/Projects/angular/node_modules/typescript,
npm WARN unmet dependency which is version 1.5.0```
but when we update our node_modules in a certain way, we lose this setup and it breaks.
We should be explicit about using a different version of typescript than gulp-typescript depends on.