83 lines
2.6 KiB
JavaScript
83 lines
2.6 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = deleteUnknownAutoBindMethods;
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function shouldDeleteClassicInstanceMethod(component, name) {
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if (component.__reactAutoBindMap && component.__reactAutoBindMap.hasOwnProperty(name)) {
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// It's a known autobound function, keep it
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return false;
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}
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if (component.__reactAutoBindPairs && component.__reactAutoBindPairs.indexOf(name) >= 0) {
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// It's a known autobound function, keep it
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return false;
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}
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if (component[name].__reactBoundArguments !== null) {
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// It's a function bound to specific args, keep it
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return false;
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}
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// It's a cached bound method for a function
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// that was deleted by user, so we delete it from component.
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return true;
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}
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function shouldDeleteModernInstanceMethod(component, name) {
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var prototype = component.constructor.prototype;
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var prototypeDescriptor = Object.getOwnPropertyDescriptor(prototype, name);
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if (!prototypeDescriptor || !prototypeDescriptor.get) {
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// This is definitely not an autobinding getter
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return false;
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}
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if (prototypeDescriptor.get().length !== component[name].length) {
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// The length doesn't match, bail out
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return false;
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}
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// This seems like a method bound using an autobinding getter on the prototype
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// Hopefully we won't run into too many false positives.
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return true;
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}
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function shouldDeleteInstanceMethod(component, name) {
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var descriptor = Object.getOwnPropertyDescriptor(component, name);
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if (typeof descriptor.value !== 'function') {
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// Not a function, or something fancy: bail out
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return;
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}
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if (component.__reactAutoBindMap || component.__reactAutoBindPairs) {
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// Classic
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return shouldDeleteClassicInstanceMethod(component, name);
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} else {
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// Modern
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return shouldDeleteModernInstanceMethod(component, name);
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}
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}
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/**
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* Deletes autobound methods from the instance.
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*
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* For classic React classes, we only delete the methods that no longer exist in map.
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* This means the user actually deleted them in code.
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*
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* For modern classes, we delete methods that exist on prototype with the same length,
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* and which have getters on prototype, but are normal values on the instance.
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* This is usually an indication that an autobinding decorator is being used,
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* and the getter will re-generate the memoized handler on next access.
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*/
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function deleteUnknownAutoBindMethods(component) {
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var names = Object.getOwnPropertyNames(component);
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names.forEach(function (name) {
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if (shouldDeleteInstanceMethod(component, name)) {
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delete component[name];
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}
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});
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}
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