110 lines
3.2 KiB
JavaScript
110 lines
3.2 KiB
JavaScript
/**
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* @copyright 2017 Alex Regan
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* @license MIT
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* @see https://github.com/alexsasharegan/vue-functional-data-merge
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*/
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export default function mergeData() {
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const mergeTarget = {};
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let i = arguments.length;
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let prop;
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let event; // Allow for variadic argument length.
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while (i--) {
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// Iterate through the data properties and execute merge strategies
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// Object.keys eliminates need for hasOwnProperty call
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for (prop of Object.keys(arguments[i])) {
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switch (prop) {
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// Array merge strategy (array concatenation)
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case 'class':
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case 'style':
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case 'directives':
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if (!Array.isArray(mergeTarget[prop])) {
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mergeTarget[prop] = [];
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} // Repackaging in an array allows Vue runtime
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// to merge class/style bindings regardless of type.
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mergeTarget[prop] = mergeTarget[prop].concat(arguments[i][prop]);
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break;
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// Space delimited string concatenation strategy
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case 'staticClass':
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if (!arguments[i][prop]) {
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break;
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}
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if (mergeTarget[prop] === undefined) {
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mergeTarget[prop] = '';
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}
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if (mergeTarget[prop]) {
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// Not an empty string, so concatenate
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mergeTarget[prop] += ' ';
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}
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mergeTarget[prop] += arguments[i][prop].trim();
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break;
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// Object, the properties of which to merge via array merge strategy (array concatenation).
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// Callback merge strategy merges callbacks to the beginning of the array,
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// so that the last defined callback will be invoked first.
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// This is done since to mimic how Object.assign merging
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// uses the last given value to assign.
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case 'on':
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case 'nativeOn':
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if (!mergeTarget[prop]) {
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mergeTarget[prop] = {};
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}
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const listeners = mergeTarget[prop];
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for (event of Object.keys(arguments[i][prop] || {})) {
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// Concat function to array of functions if callback present.
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if (listeners[event]) {
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// Insert current iteration data in beginning of merged array.
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listeners[event] = Array().concat( // eslint-disable-line
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listeners[event], arguments[i][prop][event]);
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} else {
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// Straight assign.
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listeners[event] = arguments[i][prop][event];
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}
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}
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break;
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// Object merge strategy
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case 'attrs':
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case 'props':
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case 'domProps':
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case 'scopedSlots':
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case 'staticStyle':
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case 'hook':
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case 'transition':
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if (!mergeTarget[prop]) {
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mergeTarget[prop] = {};
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}
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mergeTarget[prop] = { ...arguments[i][prop],
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...mergeTarget[prop]
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};
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break;
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// Reassignment strategy (no merge)
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case 'slot':
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case 'key':
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case 'ref':
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case 'tag':
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case 'show':
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case 'keepAlive':
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default:
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if (!mergeTarget[prop]) {
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mergeTarget[prop] = arguments[i][prop];
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}
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}
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}
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}
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return mergeTarget;
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}
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//# sourceMappingURL=mergeData.js.map
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