
p.location-badge.
  exported from <a href="/angular2/di_errors.html">angular2/di_errors</a>
  defined in <a href="https://github.com/angular/angular/tree/master/modules/angular2/src/di/exceptions.js#L124">angular2/src/di/exceptions.js (line 124)</a>

:markdown
  Thrown when dependencies form a cycle.
  
  ## Example:
  
  ```javascript
  class A {
    constructor(b:B) {}
  }
  class B {
    constructor(a:A) {}
  }
  ```
  
  Retrieving `A` or `B` throws a `CyclicDependencyError` as the graph above cannot be constructed.
  
.l-main-section
  h2 Members
  .l-sub-section
    h3 constructor

    
    pre.prettyprint
      code.
        constructor(key)
    
    :markdown
      



