75 lines
1.8 KiB
TypeScript
75 lines
1.8 KiB
TypeScript
//// [coAndContraVariantInferences.ts]
|
|
type A = { kind: 'a' };
|
|
type B = { kind: 'b' };
|
|
|
|
declare const a: A;
|
|
declare const b: B;
|
|
|
|
declare function fab(arg: A | B): void;
|
|
|
|
declare function foo<T>(x: { kind: T }, f: (arg: { kind: T }) => void): void;
|
|
|
|
foo(a, fab);
|
|
foo(b, fab);
|
|
|
|
// Repro from #45603
|
|
|
|
interface Action<TName extends string,TPayload> {
|
|
name: TName,
|
|
payload: TPayload
|
|
}
|
|
|
|
const actionA = { payload: 'any-string' } as Action<'ACTION_A', string>;
|
|
const actionB = { payload: true } as Action<'ACTION_B', boolean>;
|
|
|
|
function call<TName extends string,TPayload>(
|
|
action: Action<TName,TPayload>,
|
|
fn: (action: Action<TName,TPayload>)=> any,
|
|
) {
|
|
fn(action);
|
|
}
|
|
|
|
const printFn = (action: typeof actionA | typeof actionB)=> console.log(action);
|
|
|
|
call(actionA, printFn);
|
|
call(actionB, printFn);
|
|
|
|
|
|
//// [coAndContraVariantInferences.js]
|
|
"use strict";
|
|
foo(a, fab);
|
|
foo(b, fab);
|
|
var actionA = { payload: 'any-string' };
|
|
var actionB = { payload: true };
|
|
function call(action, fn) {
|
|
fn(action);
|
|
}
|
|
var printFn = function (action) { return console.log(action); };
|
|
call(actionA, printFn);
|
|
call(actionB, printFn);
|
|
|
|
|
|
//// [coAndContraVariantInferences.d.ts]
|
|
declare type A = {
|
|
kind: 'a';
|
|
};
|
|
declare type B = {
|
|
kind: 'b';
|
|
};
|
|
declare const a: A;
|
|
declare const b: B;
|
|
declare function fab(arg: A | B): void;
|
|
declare function foo<T>(x: {
|
|
kind: T;
|
|
}, f: (arg: {
|
|
kind: T;
|
|
}) => void): void;
|
|
interface Action<TName extends string, TPayload> {
|
|
name: TName;
|
|
payload: TPayload;
|
|
}
|
|
declare const actionA: Action<"ACTION_A", string>;
|
|
declare const actionB: Action<"ACTION_B", boolean>;
|
|
declare function call<TName extends string, TPayload>(action: Action<TName, TPayload>, fn: (action: Action<TName, TPayload>) => any): void;
|
|
declare const printFn: (action: typeof actionA | typeof actionB) => void;
|