apollo-client-devtools/src/bridge.js

Developer tools for Apollo Client, with GraphiQL integration, cache inspection, and query watching.

import { EventEmitter } from "events";

export default class Bridge extends EventEmitter {
  constructor(wall) {
    super();
    // Setting `this` to `self` here to fix an error in the Safari build:
    // ReferenceError: Cannot access uninitialized variable.
    // The error might be related to the webkit bug here:
    // https://bugs.webkit.org/show_bug.cgi?id=171543
    const self = this;
    self.setMaxListeners(Infinity);
    self.wall = wall;
    wall.listen(message => {
      if (typeof message === "string") {
        self.emit(message);
      } else {
        self.emit(message.event, message.payload);
      }
    });
  }

  send(event, payload) {
    this.wall.send({
      event,
      payload,
    });
  }

  log(message) {
    this.send("log", message);
  }
}