File: unionThisTypeInFunctions.js

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//// [unionThisTypeInFunctions.ts]
interface Real {
    method(this: this, n: number): void;
    data: string;
}
interface Fake {
    method(this: this, n: number): void;
    data: number;
}
function test(r: Real | Fake) {
    r.method(12); // error
}


//// [unionThisTypeInFunctions.js]
function test(r) {
    r.method(12); // error
}