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