File: symbolProperty21.js

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node-typescript 3.3.3333-1
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//// [symbolProperty21.ts]
interface I<T, U> {
    [Symbol.unscopables]: T;
    [Symbol.isConcatSpreadable]: U;
}

declare function foo<T, U>(p: I<T, U>): { t: T; u: U };

foo({
    [Symbol.isConcatSpreadable]: "",
    [Symbol.toPrimitive]: 0,
    [Symbol.unscopables]: true
});

//// [symbolProperty21.js]
foo({
    [Symbol.isConcatSpreadable]: "",
    [Symbol.toPrimitive]: 0,
    [Symbol.unscopables]: true
});