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prettier Show covariance.js Source code

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  1. /* @flow */
  2.  
  3. async function testAll() {
  4.   /* This is a test case from https://github.com/facebook/flow/issues/1143
  5.    * which was previously an error due to Array's invariance and an improper
  6.    * definition of Promise.all */
  7.     const x: Array<Promise<?string>> = [];
  8.     const y: Promise<Array<?string>> = Promise.all(x);
  9.     const z: Array<?string> = await y;
  10. }
  11.  
  12. async function testRace() {
  13.     const x: Array<Promise<?string>> = [];
  14.     const y: Promise<?string> = Promise.race(x);
  15.     const z: ?string = await y;
  16. }
  17.  
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