Git Start Failing

[Cmaxster]

`app/mock-xhr-backend.ts(61,38): error TS2339: Property 'find' does not exist on type '{ id: number; name: string; medium: string; category: string; year: number; watchedOn: number; is...'.
node_modules/@angular/common/src/pipes/async_pipe.d.ts(39,38): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/directive_normalizer.d.ts(19,100): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/directive_normalizer.d.ts(21,74): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/offline_compiler.d.ts(31,124): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/resource_loader.d.ts(13,23): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/runtime_compiler.d.ts(40,49): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/runtime_compiler.d.ts(42,65): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/util.d.ts(35,18): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/compiler/src/util.d.ts(36,46): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/application_init.d.ts(16,18): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/application_ref.d.ts(106,67): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/application_ref.d.ts(122,101): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/application_ref.d.ts(148,67): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/application_ref.d.ts(150,101): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/facade/lang.d.ts(12,17): error TS2304: Cannot find name 'Map'.
node_modules/@angular/core/src/facade/lang.d.ts(13,17): error TS2304: Cannot find name 'Set'.
node_modules/@angular/core/src/linker/compiler.d.ts(53,49): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/linker/compiler.d.ts(61,65): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/linker/ng_module_factory_loader.d.ts(14,34): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/core/src/linker/system_js_ng_module_factory_loader.d.ts(28,25): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/platform-browser-dynamic/src/resource_loader/resource_loader_impl.d.ts(10,23): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/config.d.ts(279,62): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/interfaces.d.ts(78,99): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/interfaces.d.ts(157,109): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/interfaces.d.ts(227,115): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/interfaces.d.ts(297,91): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/interfaces.d.ts(367,50): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/router.d.ts(386,70): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/router.d.ts(408,59): error TS2304: Cannot find name 'Promise'.
node_modules/@angular/router/src/utils/collection.d.ts(35,58): error TS2304: Cannot find name 'Promise'.
node_modules/@types/core-js/index.d.ts(47,36): error TS2304: Cannot find name 'Iterable'.
node_modules/@types/core-js/index.d.ts(353,48): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(354,52): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(355,34): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(356,34): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(357,34): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(358,61): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(359,60): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(360,65): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(360,97): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(361,60): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(362,58): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(363,59): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(364,58): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(365,61): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(365,117): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(366,42): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(368,81): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(369,78): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(370,76): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(371,73): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(434,6): error TS2304: Cannot find name 'Symbol'.
node_modules/@types/core-js/index.d.ts(459,39): error TS2304: Cannot find name 'Promise'.
node_modules/@types/core-js/index.d.ts(467,59): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(468,59): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(470,48): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(471,69): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(475,40): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(477,48): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(693,55): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(694,45): error TS2304: Cannot find name 'PropertyKey'.
node_modules/@types/core-js/index.d.ts(710,46): error TS2304: Cannot find name 'Iterable'.
node_modules/@types/core-js/index.d.ts(711,43): error TS2304: Cannot find name 'Iterable'.
node_modules/@types/core-js/index.d.ts(826,20): error TS2304: Cannot find name 'PromiseConstructor'.
node_modules/@types/core-js/index.d.ts(841,32): error TS2304: Cannot find name 'Iterable'.
node_modules/@types/core-js/index.d.ts(845,39): error TS2304: Cannot find name 'Iterable'.
node_modules/@types/core-js/index.d.ts(845,53): error TS2304: Cannot find name 'Iterator'.
node_modules/@types/core-js/index.d.ts(856,35): error TS2304: Cannot find name 'Promise'.
node_modules/@types/core-js/index.d.ts(1479,36): error TS2339: Property 'for' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1483,43): error TS2339: Property 'hasInstance' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1487,50): error TS2339: Property 'isConcatSpreadable' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1491,40): error TS2339: Property 'iterator' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1495,38): error TS2339: Property 'keyFor' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1499,37): error TS2339: Property 'match' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1503,39): error TS2339: Property 'replace' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1507,38): error TS2339: Property 'search' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1511,39): error TS2339: Property 'species' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1515,37): error TS2339: Property 'split' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1519,43): error TS2339: Property 'toPrimitive' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1523,43): error TS2339: Property 'toStringTag' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(1527,43): error TS2339: Property 'unscopables' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2294,36): error TS2339: Property 'for' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2298,43): error TS2339: Property 'hasInstance' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2302,50): error TS2339: Property 'isConcatSpreadable' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2306,40): error TS2339: Property 'iterator' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2310,38): error TS2339: Property 'keyFor' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2314,37): error TS2339: Property 'match' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2318,39): error TS2339: Property 'replace' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2322,38): error TS2339: Property 'search' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2326,39): error TS2339: Property 'species' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2330,37): error TS2339: Property 'split' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2334,43): error TS2339: Property 'toPrimitive' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2338,43): error TS2339: Property 'toStringTag' does not exist on type 'SymbolConstructor'.
node_modules/@types/core-js/index.d.ts(2342,43): error TS2339: Property 'unscopables' does not exist on type 'SymbolConstructor'.
node_modules/rxjs/Observable.d.ts(10,66): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/Observable.d.ts(66,60): error TS2304: Cannot find name 'Promise'.
node_modules/rxjs/Observable.d.ts(66,70): error TS2304: Cannot find name 'Promise'.

npm ERR! Darwin 16.6.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "start"
npm ERR! node v6.11.1
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! angular2-essential-training@1.0.0 start: tsc && concurrently "tsc -w" "lite-server"
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the angular2-essential-training@1.0.0 start script 'tsc && concurrently "tsc -w" "lite-server" '.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the angular2-essential-training package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! tsc && concurrently "tsc -w" "lite-server"
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs angular2-essential-training
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls angular2-essential-training
npm ERR! There is likely additional logging output above.
`

This is what I'm getting when I follow the git start instructions after installing... what's happening here?

[Cmaxster]

Ok.. I kind of answered my own question.. I saw the comment about the carot symbol under devDependencies in package.json..

I have a quick follow up question:

Why would the carot symbol be there? What does that mean?

[Cmaxster]

My last question:

attempting to follow the "git checkout" instructions leaves me with these errors:

cattor:angular2-essential-training cmax$ git checkout 02-01b
cattor: pathspec '02-01b' did not match any file(s) known to git.
catorlbw5925:angular2-essential-training cmax$ git branch

• master

[jschwarty]

The carot symbol means "use this version number or any version higher". It gets used if you want to support anything after a specific version. But that can be challenging at times when working with 3rd party libs because sometimes a new version comes out that affects your code. So usually it's best to "peg" it at a specific version for what you need for your app...using the version number without any special symbol in front of it.

[jschwarty]

For the checkout, you actually need to do git checkout -b 02-01b to checkout and create that branch locally (for each of the branches you switch to the first time). I had a Pull Request to update the README.md file that @AndrewWeb-Dev was gracious enough to create that I had never merged in (until now!). So the README.md now has the correct branch change info.