[BUG] Middleware is loading .js.map of .js #255
Description
The Problem comes when a custom middleware based on Typescript is used. Typescript generates two files .js and .js.map - which is used for mapping.
map.js should be also covered in getExcludedExtensions method https://github.com/strongloop/loopback-boot/blob/master/lib/utils.js#L101
Otherwise, its breaking the execution with the error:
Unhandled rejection SyntaxError: Unexpected token :
/Users/ivan/www/resport.dev/resport.today/build/server/middleware/errorLogger.js.map:1
(function (exports, require, module, __filename, __dirname) { {"version":3,"sources":["server/middleware/errorLogger.ts"],"names":[],"mappings":";AAAA,6CAA0C;AAK1C,iBAAS,cAAM,OAAA,UAAC,GAAG,EAAE,GAAG,EAAE,GAAG,EAAE,IAAI;IACjC,IAAI,eAAM,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IAC/B,MAAM,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;AACnB,CAAC,EAHc,CAGd,CAAC","file":"errorLogger.js","sourcesContent":["import {Logger} from 'app/service/logger';\n\n/**\n * error logger middleware\n */\nexport = () => (err, req, res, next) => {\n new Logger(req.app).error(err);\n return next(err);\n};\n"]}
^
SyntaxError: Unexpected token :
at Object.exports.runInThisContext (vm.js:76:16)
at Module._compile (module.js:513:28)
at Object.Module._extensions..js (module.js:550:10)
at Module.load (module.js:458:32)
at tryModuleLoad (module.js:417:12)
at Function.Module._load (module.js:409:3)
at Module.require (module.js:468:17)
at require (internal/module.js:20:19)
at /Users/ivan/www/resport.dev/resport.today/node_modules/loopback-boot/lib/plugins/middleware.js:259:19
at Array.forEach (native)
at Middleware.start (/Users/ivan/www/resport.dev/resport.today/node_modules/loopback-boot/lib/plugins/middleware.js:253:14)
at executePluginPhase (/Users/ivan/www/resport.dev/resport.today/node_modules/loopback-boot/lib/bootstrapper.js:166:39)Tested on: 2.25.0, 3.0.1.
Vendors:
"loopback": "3.9.0",
"loopback-boot": "3.0.1",
"loopback-component-explorer": "4.2.0",
"loopback-component-passport": "3.4.0",
"loopback-connector-mongodb": "3.2.1",
"loopback-ds-timestamp-mixin": "3.4.1",