如何将方法添加到分配给变量c的对象常量中，以便满足类型检查？

Question

如何满足下面代码片段中的类型检查？

interface Counter {
    getCount: () => number
    increment: (n: number) => void
}
let c: Counter = {}

Answer 1

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let c: Counter = {
    getCount: () => 1,
    increment: (n: number) => {}
}