70 lines
3.0 KiB
JavaScript
70 lines
3.0 KiB
JavaScript
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import verifyPlainObject from '../utils/verifyPlainObject';
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export function wrapMapToPropsConstant( // * Note:
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// It seems that the dispatch argument
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// could be a dispatch function in some cases (ex: whenMapDispatchToPropsIsMissing)
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// and a state object in some others (ex: whenMapStateToPropsIsMissing)
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// eslint-disable-next-line no-unused-vars
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getConstant) {
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return function initConstantSelector(dispatch) {
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const constant = getConstant(dispatch);
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function constantSelector() {
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return constant;
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}
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constantSelector.dependsOnOwnProps = false;
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return constantSelector;
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};
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} // dependsOnOwnProps is used by createMapToPropsProxy to determine whether to pass props as args
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// to the mapToProps function being wrapped. It is also used by makePurePropsSelector to determine
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// whether mapToProps needs to be invoked when props have changed.
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//
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// A length of one signals that mapToProps does not depend on props from the parent component.
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// A length of zero is assumed to mean mapToProps is getting args via arguments or ...args and
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// therefore not reporting its length accurately..
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// TODO Can this get pulled out so that we can subscribe directly to the store if we don't need ownProps?
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export function getDependsOnOwnProps(mapToProps) {
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return mapToProps.dependsOnOwnProps ? Boolean(mapToProps.dependsOnOwnProps) : mapToProps.length !== 1;
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} // Used by whenMapStateToPropsIsFunction and whenMapDispatchToPropsIsFunction,
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// this function wraps mapToProps in a proxy function which does several things:
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//
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// * Detects whether the mapToProps function being called depends on props, which
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// is used by selectorFactory to decide if it should reinvoke on props changes.
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//
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// * On first call, handles mapToProps if returns another function, and treats that
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// new function as the true mapToProps for subsequent calls.
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//
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// * On first call, verifies the first result is a plain object, in order to warn
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// the developer that their mapToProps function is not returning a valid result.
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//
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export function wrapMapToPropsFunc(mapToProps, methodName) {
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return function initProxySelector(dispatch, {
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displayName
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}) {
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const proxy = function mapToPropsProxy(stateOrDispatch, ownProps) {
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return proxy.dependsOnOwnProps ? proxy.mapToProps(stateOrDispatch, ownProps) : proxy.mapToProps(stateOrDispatch, undefined);
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}; // allow detectFactoryAndVerify to get ownProps
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proxy.dependsOnOwnProps = true;
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proxy.mapToProps = function detectFactoryAndVerify(stateOrDispatch, ownProps) {
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proxy.mapToProps = mapToProps;
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proxy.dependsOnOwnProps = getDependsOnOwnProps(mapToProps);
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let props = proxy(stateOrDispatch, ownProps);
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if (typeof props === 'function') {
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proxy.mapToProps = props;
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proxy.dependsOnOwnProps = getDependsOnOwnProps(props);
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props = proxy(stateOrDispatch, ownProps);
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}
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if (process.env.NODE_ENV !== 'production') verifyPlainObject(props, displayName, methodName);
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return props;
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};
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return proxy;
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};
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}
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