message: fix(pkg): add `require` export condition
diff: ".": {
  "types": "./dist/types/index.d.ts",
  "node": "./dist/cjs/index.js",
  + "require": "./dist/cjs/index.js",
  "es2015": "./dist/esm/index.js",
  "default": "./dist/esm5/index.js"
  },
  "./ajax": {
  "types": "./dist/types/ajax/index.d.ts",
  "node": "./dist/cjs/ajax/index.js",
  + "require": "./dist/cjs/ajax/index.js",
  "es2015": "./dist/esm/ajax/index.js",
  "default": "./dist/esm5/ajax/index.js"
  },
  "./fetch": {
  "types": "./dist/types/fetch/index.d.ts",
  "node": "./dist/cjs/fetch/index.js",
  + "require": "./dist/cjs/fetch/index.js",
  "es2015": "./dist/esm/fetch/index.js",
  "default": "./dist/esm5/fetch/index.js"
  },
  "./operators": {
  "types": "./dist/types/operators/index.d.ts",
  "node": "./dist/cjs/operators/index.js",
  + "require": "./dist/cjs/operators/index.js",
  "es2015": "./dist/esm/operators/index.js",
  "default": "./dist/esm5/operators/index.js"
  },
  "./testing": {
  "types": "./dist/types/testing/index.d.ts",
  "node": "./dist/cjs/testing/index.js",
  + "require": "./dist/cjs/testing/index.js",
  "es2015": "./dist/esm/testing/index.js",
  "default": "./dist/esm5/testing/index.js"
  },
  "./webSocket": {
  "types": "./dist/types/webSocket/index.d.ts",
  "node": "./dist/cjs/webSocket/index.js",
  + "require": "./dist/cjs/webSocket/index.js",
  "es2015": "./dist/esm/webSocket/index.js",
  "default": "./dist/esm5/webSocket/index.js"
  },
  "./internal/*": {
  "types": "./dist/types/internal/*.d.ts",
  "node": "./dist/cjs/internal/*.js",
  + "require": "./dist/cjs/internal/*.js",
  "es2015": "./dist/esm/internal/*.js",
  "default": "./dist/esm5/internal/*.js"
  },
  