chrome-extension & inject.js

inject.js

/* eslint-env browser */(() => {  try {    const detectJs = (chain) => {      const properties = chain.split('.');      let value = properties.length ? window : null;      for (let i = 0; i < properties.length; i++) {        const property = properties[i];        if (value && value.hasOwnProperty(property)) {          value = value[property];        } else {          value = null;          break;        }      }      return typeof value === 'string' || typeof value === 'number' ? value : !!value;    };    const onMessage = (event) => {      if (event.data.id !== 'patterns') {        return;      }      removeEventListener('message', onMessage);      const patterns = event.data.patterns || {};      const js = {};      for (const appName in patterns) {        if (patterns.hasOwnProperty(appName)) {          js[appName] = {};          for (const chain in patterns[appName]) {            if (patterns[appName].hasOwnProperty(chain)) {              js[appName][chain] = {};              for (const index in patterns[appName][chain]) {                const value = detectJs(chain);                if (value && patterns[appName][chain].hasOwnProperty(index)) {                  js[appName][chain][index] = value;                }              }            }          }        }      }      postMessage({ id: 'js', js }, '*');    };    addEventListener('message', onMessage);  } catch (e) {    // Fail quietly  }})();