Fixed lint errors in parser.js.
Fixed lint errors in parser.js.

notthetup/swig,Lochlan/swig,jrvldam/swig,gitoneman/swig,cwhatley/swig,benpptung/swig,Lochlan/swig,paularmstrong/swig,zetlen/swig,zetlen/swig,jerrylin1002/swig,Thunf/swiger,zongkelong/swig,cwhatley/swig,paularmstrong/swig,mrazvan92/swig-async,cgvarela/swig,DragWeb/swig,benpptung/swig,notthetup/swig,xiaoyang2022/swig,DragWeb/swig,mahdaen/swig,gold3bear/swig,gogobook/swig,gitoneman/swig,mrazvan92/swig-async,genify/swig,xiaoyang2022/swig,notthetup/swig,gitoneman/swig,cgvarela/swig,Lochlan/swig,zongkelong/swig,mrazvan92/swig-template-callback,gogobook/swig,cgvarela/swig,cwhatley/swig,CuteSephiroth/swig,mrazvan92/swig-template-callback,gold3bear/swig,xiaoyang2022/swig,gold3bear/swig,benpptung/swig,DragWeb/swig,Thunf/swiger,zetlen/swig,paularmstrong/swig,jerrylin1002/swig,mrazvan92/swig-template-callback,genify/swig,mrazvan92/swig-async,mahdaen/swig,jerrylin1002/swig,CuteSephiroth/swig,jrvldam/swig,mahdaen/swig,Thunf/swiger,zongkelong/swig,genify/swig,gogobook/swig,CuteSephiroth/swig,jrvldam/swig