| 1 | export const CallableInstance =
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| 2 | /**
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| 3 | * @type {new <Parameters extends Array<unknown>, Result>(property: string | symbol) => (...parameters: Parameters) => Result}
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| 4 | */
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| 5 | (
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| 6 | /** @type {unknown} */
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| 7 | (
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| 8 | /**
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| 9 | * @this {Function}
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| 10 | * @param {string | symbol} property
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| 11 | * @returns {(...parameters: Array<unknown>) => unknown}
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| 12 | */
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| 13 | function (property) {
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| 14 | const self = this
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| 15 | const constr = self.constructor
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| 16 | const proto = /** @type {Record<string | symbol, Function>} */ (
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| 17 | // Prototypes do exist.
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| 18 | // type-coverage:ignore-next-line
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| 19 | constr.prototype
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| 20 | )
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| 21 | const value = proto[property]
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| 22 | /** @type {(...parameters: Array<unknown>) => unknown} */
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| 23 | const apply = function () {
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| 24 | return value.apply(apply, arguments)
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| 25 | }
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| 26 |
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| 27 | Object.setPrototypeOf(apply, proto)
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| 28 |
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| 29 | // Not needed for us in `unified`: we only call this on the `copy`
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| 30 | // function,
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| 31 | // and we don't need to add its fields (`length`, `name`)
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| 32 | // over.
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| 33 | // See also: GH-246.
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| 34 | // const names = Object.getOwnPropertyNames(value)
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| 35 | //
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| 36 | // for (const p of names) {
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| 37 | // const descriptor = Object.getOwnPropertyDescriptor(value, p)
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| 38 | // if (descriptor) Object.defineProperty(apply, p, descriptor)
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| 39 | // }
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| 40 |
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| 41 | return apply
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| 42 | }
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| 43 | )
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| 44 | )
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