import Vue from 'vue';
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import { warn } from './util';
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export function collectDataFromConstructor(vm, Component) {
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// override _init to prevent to init as Vue instance
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const originalInit = Component.prototype._init;
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Component.prototype._init = function () {
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// proxy to actual vm
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const keys = Object.getOwnPropertyNames(vm);
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// 2.2.0 compat (props are no longer exposed as self properties)
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if (vm.$options.props) {
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for (const key in vm.$options.props) {
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if (!vm.hasOwnProperty(key)) {
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keys.push(key);
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}
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}
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}
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keys.forEach(key => {
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Object.defineProperty(this, key, {
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get: () => vm[key],
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set: value => { vm[key] = value; },
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configurable: true
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});
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});
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};
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// should be acquired class property values
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const data = new Component();
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// restore original _init to avoid memory leak (#209)
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Component.prototype._init = originalInit;
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// create plain data object
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const plainData = {};
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Object.keys(data).forEach(key => {
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if (data[key] !== undefined) {
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plainData[key] = data[key];
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}
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});
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if (process.env.NODE_ENV !== 'production') {
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if (!(Component.prototype instanceof Vue) && Object.keys(plainData).length > 0) {
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warn('Component class must inherit Vue or its descendant class ' +
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'when class property is used.');
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}
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}
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return plainData;
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}
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