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28 lines
623 B
28 lines
623 B
export function prop (object: Object, name: string, f: ()=>any): void {
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Object.defineProperty(object, name, {
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configurable: true,
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enumerable: true,
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get: function () {
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let value = f.call(this)
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this[name] = value
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return value
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},
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set: function (value) {
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Object.defineProperty(this, name, {
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configurable: true,
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enumerable: true,
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value: value,
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writable: true
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})
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}
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})
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}
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export function value <T> (f: ()=>T): ()=>T {
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let value: T
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return function (): T {
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if (value !== undefined) return value
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value = f()
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return value
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}
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}
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