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我想編碼一個變量（例如accessToken在這裏），但我使用Angular CLI，所以，Webpack，我想用jwt-簡單的是這樣的：Angular CLI - 祕密密鑰加密密鑰：jwt-simple不起作用
const encryptedAccessToken = jwt.encode(user.accessToken, APP_SECRET)
我已導入模塊智威湯遜 - 用簡單：
var jwt = require('jwt-simple');
但後來我有一個鏈接到加密模塊的錯誤：
ERROR Error: Uncaught (in promise): TypeError: crypto.createHmac is not a function
TypeError: crypto.createHmac is not a function
at sign (jwt.js:177)
at Object.jwt_encode [as encode] (jwt.js:143)
at authentication.service.ts:41
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:391)
at Object.onInvoke (core.es5.js:3890)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:390)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.run (zone.js:141)
at zone.js:831
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:424)
at Object.onInvokeTask (core.es5.js:3881)
at sign (jwt.js:177)
at Object.jwt_encode [as encode] (jwt.js:143)
at authentication.service.ts:41
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:391)
at Object.onInvoke (core.es5.js:3890)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:390)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.run (zone.js:141)
at zone.js:831
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:424)
at Object.onInvokeTask (core.es5.js:3881)
at resolvePromise (zone.js:783)
at zone.js:834
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:424)
at Object.onInvokeTask (core.es5.js:3881)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:423)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (zone.js:191)
at drainMicroTaskQueue (zone.js:595)
at ZoneTask.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (zone.js:502)
at invokeTask (zone.js:1370)
at XMLHttpRequest.globalZoneAwareCallback (zone.js:1388)
defaultErrorLogger @ core.es5.js:1020
webpackJsonp.../../../core/@angular/core.es5.js.ErrorHandler.handleError @ core.es5.js:1080
next @ core.es5.js:4503
schedulerFn @ core.es5.js:3635
webpackJsonp.../../../../rxjs/Subscriber.js.SafeSubscriber.__tryOrUnsub @ Subscriber.js:238
webpackJsonp.../../../../rxjs/Subscriber.js.SafeSubscriber.next @ Subscriber.js:185
webpackJsonp.../../../../rxjs/Subscriber.js.Subscriber._next @ Subscriber.js:125
webpackJsonp.../../../../rxjs/Subscriber.js.Subscriber.next @ Subscriber.js:89
webpackJsonp.../../../../rxjs/Subject.js.Subject.next @ Subject.js:55
webpackJsonp.../../../core/@angular/core.es5.js.EventEmitter.emit @ core.es5.js:3621
(anonymous) @ core.es5.js:3912
webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:391
webpackJsonp.../../../../zone.js/dist/zone.js.Zone.run @ zone.js:141
webpackJsonp.../../../core/@angular/core.es5.js.NgZone.runOutsideAngular @ core.es5.js:3844
onHandleError @ core.es5.js:3912
webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.handleError @ zone.js:395
webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runGuarded @ zone.js:157
_loop_1 @ zone.js:666
api.microtaskDrainDone @ zone.js:675
drainMicroTaskQueue @ zone.js:603
webpackJsonp.../../../../zone.js/dist/zone.js.ZoneTask.invokeTask @ zone.js:502
invokeTask @ zone.js:1370
globalZoneAwareCallback @ zone.js:1388
我不知道是否有另一種方法來保護Angular CLI的祕密變量，或者如果我能解決這個密碼問題？