Plunkr listed in readme produces syntax error : ( #1097

Version info

See Plunkr

How to reproduce these conditions

Failing test unit, Plunkr, or JSFiddle demonstrating the problem
Plunkr, just load it and look at the JS console.

Steps to set up and reproduce
I reproduced this by simply taking the existing Plunkr in the README and adding my creds as explained in the comments.

Sample data and security rules
n/a

Debug output

** Errors in the JavaScript console **

Error: Can't resolve all parameters for AppComponent: (?).
at syntaxError (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:1725:34) []
at CompileMetadataResolver._getDependenciesMetadata (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:15800:35) []
at CompileMetadataResolver._getTypeMetadata (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:15668:26) []
at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:15263:24) []
at CompileMetadataResolver._getEntryComponentMetadata (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:15922:45) []
at eval (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:15504:110) []
at Array.map (native) []
at CompileMetadataResolver.getNgModuleMetadata (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:15504:73) []
at JitCompiler._loadModules (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:26830:70) []
at JitCompiler.compileModuleAndComponents (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:26803:36) []
at JitCompiler.compileModuleAsync (https://unpkg.com/@angular/compiler/bundles/compiler.umd.js:26732:37) []
at PlatformRef.bootstrapModuleWithZone (https://unpkg.com/@angular/core/bundles/core.umd.js:4568:25) []
at PlatformRef.bootstrapModule (https://unpkg.com/@angular/core/bundles/core.umd.js:4554:21) []
at Object.eval (http://run.plnkr.co/27iXZTT3rlETmedN/app/main.ts!transpiled:5:10) []
Evaluating http://run.plnkr.co/27iXZTT3rlETmedN/app/main.ts
Error loading http://run.plnkr.co/27iXZTT3rlETmedN/app/main.ts

** Output from firebase.database().enableLogging(true); **
n/a

** Screenshots **
n/a

Expected behavior

Should present a list of books per the example.

Actual behavior

JS Console error.