prettier/tests/flow/poly/__snapshots__/jsfmt.spec.js.snap

// Jest Snapshot v1, https://goo.gl/fbAQLP

exports[`annot.js 1`] = `
class A<X> { }
new A; // OK, implicitly inferred type args
class B extends A { } // OK, same as above

function foo(b): A<any> { // ok but unsafe, caller may assume any type arg
  return b ? (new A: A<number>): (new A: A<string>);
}

function bar(): A<*> { // error, * can't be {} and {x: string} at the same time
  return (new A: A<{}>) || (new A: A<{x: string}>);
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class A<X> {}
new A(); // OK, implicitly inferred type args
class B extends A {} // OK, same as above

function foo(b): A<any> {
  // ok but unsafe, caller may assume any type arg
  return b ? (new A(): A<number>) : (new A(): A<string>);
}

function bar(): A<*> {
  // error, * can't be {} and {x: string} at the same time
  return (new A(): A<{}>) || (new A(): A<{ x: string }>);
}

`;

exports[`implicit_bounded_instantiation.js 1`] = `
// @flow

class Base {}
class Middle extends Base {}
class Child extends Middle {}

class C<T: Middle> {
  meth(a: T): T {
    return a;
  }
}

// T is implicitly (bounded by) Middle in constructor call if not provided.
// Explicit type arg is required in annotation - here a wildcard captures it.
var a: C<*> = new C();

a.meth(new Middle());
a.meth(new Child());
a.meth(42); // Error: number ~> Middle
a.meth(new Base()); // Error: Base ~> Middle
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// @flow

class Base {}
class Middle extends Base {}
class Child extends Middle {}

class C<T: Middle> {
  meth(a: T): T {
    return a;
  }
}

// T is implicitly (bounded by) Middle in constructor call if not provided.
// Explicit type arg is required in annotation - here a wildcard captures it.
var a: C<*> = new C();

a.meth(new Middle());
a.meth(new Child());
a.meth(42); // Error: number ~> Middle
a.meth(new Base()); // Error: Base ~> Middle

`;

exports[`issue-1029.js 1`] = `
// @flow

// naive unification causes combinatorial explosion here,
// effectively hangs

declare type Box<T> = {
  map1<U>(f: (x: T) => U): Box<U>;
  map2<U>(f: (x: T) => U): Box<U>;
  map3<U>(f: (x: T) => U): Box<U>;
  map4<U>(f: (x: T) => U): Box<U>;
  map5<U>(f: (x: T) => U): Box<U>;
}

declare var bool: Box<boolean>;

declare function unbox<A>(box: Box<A>): A

unbox(bool);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// @flow

// naive unification causes combinatorial explosion here,
// effectively hangs

declare type Box<T> = {
  map1<U>(f: (x: T) => U): Box<U>,
  map2<U>(f: (x: T) => U): Box<U>,
  map3<U>(f: (x: T) => U): Box<U>,
  map4<U>(f: (x: T) => U): Box<U>,
  map5<U>(f: (x: T) => U): Box<U>
};

declare var bool: Box<boolean>;

declare function unbox<A>(box: Box<A>): A;

unbox(bool);

`;

exports[`poly.js 1`] = `
class Foo<T> {
    x:T;
    constructor(x:T) { this.x = x; }
}

function bar<S>(foo:Foo<S>,y:S):Foo<S> { return new Foo(y); }

var P = {
    bar: bar
}

declare var Q: {
    bar<S>(foo:Foo<S>,y:S):Foo<S>;
}

var foo = new Foo(0);
var x:string = foo.x;
var z:Foo<number> = Q.bar(foo,"");
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class Foo<T> {
  x: T;
  constructor(x: T) {
    this.x = x;
  }
}

function bar<S>(foo: Foo<S>, y: S): Foo<S> {
  return new Foo(y);
}

var P = {
  bar: bar
};

declare var Q: {
  bar<S>(foo: Foo<S>, y: S): Foo<S>
};

var foo = new Foo(0);
var x: string = foo.x;
var z: Foo<number> = Q.bar(foo, "");

`;

exports[`test.js 1`] = `
class C {
  foo<X>(x: X): X { return x; }
  foo_<X: number>(x: X): number { return x; }
  bar<X>(x: X): X { return x; }
  qux(x: number): number { return x; }
}
class D extends C {
  foo(x: number): number { return x; } // error (specialization, see below)
  foo_(x: number): number { return x; } // OK, but only because the overridden foo accepts no more than number and returns exactly number
  bar<X>(x: X): X { return x; } // OK
  qux<X>(x: X): X { return x; } // OK (generalization)
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class C {
  foo<X>(x: X): X {
    return x;
  }
  foo_<X: number>(x: X): number {
    return x;
  }
  bar<X>(x: X): X {
    return x;
  }
  qux(x: number): number {
    return x;
  }
}
class D extends C {
  foo(x: number): number {
    return x;
  } // error (specialization, see below)
  foo_(x: number): number {
    return x;
  } // OK, but only because the overridden foo accepts no more than number and returns exactly number
  bar<X>(x: X): X {
    return x;
  } // OK
  qux<X>(x: X): X {
    return x;
  } // OK (generalization)
}

`;