@fruits-chain/react-native-xiaoshu/lib/module/theme/create-var.js

🌈 React Native UI library

import isNil from 'lodash/isNil';
const StyleMap = new Map();
export const createVar = (token, creator) => {
  let myStyle;

  for (let [key, value] of StyleMap) {
    if (key[1] === creator) {
      if (key[0] === token) {
        myStyle = value;
      } else {
        StyleMap.delete(key);
      }
    }
  }

  if (!myStyle) {
    myStyle = creator(token); // 变量覆盖

    Object.keys(myStyle).forEach(field => {
      if (!isNil(token[field])) {
        myStyle[field] = token[field];
      }
    });
    StyleMap.set([token, creator], myStyle);
  }

  return myStyle;
};
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