1 | ;
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2 |
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3 | exports.__esModule = true;
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4 | exports.default = usePrevious;
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5 |
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6 | var _react = require("react");
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7 |
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8 | /**
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9 | * Store the last of some value. Tracked via a `Ref` only updating it
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10 | * after the component renders.
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11 | *
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12 | * Helpful if you need to compare a prop value to it's previous value during render.
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13 | *
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14 | * ```ts
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15 | * function Component(props) {
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16 | * const lastProps = usePrevious(props)
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17 | *
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18 | * if (lastProps.foo !== props.foo)
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19 | * resetValueFromProps(props.foo)
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20 | * }
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21 | * ```
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22 | *
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23 | * @param value the value to track
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24 | */
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25 | function usePrevious(value) {
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26 | var ref = (0, _react.useRef)(null);
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27 | (0, _react.useEffect)(function () {
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28 | ref.current = value;
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29 | });
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30 | return ref.current;
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31 | } |
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