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prettier Show map.js Source code

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  1. // @flow
  2.  
  3. function* generator(): Iterable<[string, number]> {
  4.   while (true) {
  5.     yield ['foo', 123];
  6.   }
  7. }
  8.  
  9. let tests = [
  10.   // good constructors
  11.   function() {
  12.     let w = new Map();
  13.     let x = new Map(null);
  14.     let y = new Map([['foo', 123]]);
  15.     let z = new Map(generator());
  16.     let a: Map<string, number> = new Map();
  17.     let b: Map<string, number> = new Map([['foo', 123]]);
  18.     let c: Map<string, number> = new Map(generator());
  19.   },
  20.  
  21.   // bad constructors
  22.   function() {
  23.     let x = new Map(['foo', 123]); // error
  24.     let y: Map<number, string> = new Map([['foo', 123]]); // error
  25.   },
  26.  
  27.   // get()
  28.   function(x: Map<string, number>) {
  29.     (x.get('foo'): boolean); // error, string | void
  30.     x.get(123); // error, wrong key type
  31.   },
  32. ];
  33.  
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