extract: Add a performant indexOf escape

[ajoslin]

When browserify is compiling hundreds of files, this gives a noticeable performance boost.

If you need a benchmark before merging this, I can make one.

[codecov-io]

Current coverage is 100.00%

Merging #2 into master will not affect coverage as of b1861ae

@@            master      #2   diff @@
======================================
  Files            1       1       
  Stmts           35      36     +1
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit             35      36     +1
  Partial          0       0       
  Missed           0       0       

Review entire Coverage Diff as of b1861ae

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[ahdinosaur]

looks good to me, thanks @ajoslin. 😄

[ahdinosaur]

merged as 7a6e36d, @yoshuawuyts can we has publish?

[yoshuawuyts]

💯 go for it!

[ajoslin]

Closing in favor of #4