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16 lines
707 B
16 lines
707 B
7 years ago
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/**
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* expr can be used to create temporarily views inside views.
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* This can be improved to improve performance if a value changes often, but usually doesn't affect the outcome of an expression.
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*
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* In the following example the expression prevents that a component is rerender _each time_ the selection changes;
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* instead it will only rerenders when the current todo is (de)selected.
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*
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* reactiveComponent((props) => {
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* const todo = props.todo;
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* const isSelected = mobx.expr(() => props.viewState.selection === todo);
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* return <div className={isSelected ? "todo todo-selected" : "todo"}>{todo.title}</div>
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* });
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*
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*/
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export declare function expr<T>(expr: () => T, scope?: any): T;
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