我几个小时后做了npm update，现在看来我不能再做npm install了。每次我这样做，我都会收到错误
Unexpected string in JSON on npm install for existing module
我的日志似乎表明它位于模块bluebird中，如下所示：
13 verbose stack SyntaxError: Unexpected string in JSON at position 493
13 verbose stack at JSON.parse (<anonymous>)
13 verbose stack at module.exports (/usr/local/lib/node_modules/npm/lib/utils/parse-json.js:3:15)
13 verbose stack at BB.join (/usr/local/lib/node_modules/npm/lib/install/read-shrinkwrap.js:31:20)
13 verbose stack at tryCatcher (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/util.js:16:23)
13 verbose stack at Holder$3._callFunction (eval at generateHolderClass (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/join.js:92:16), <anonymous>:14:44)
13 verbose stack at Holder$3.checkFulfillment (eval at generateHolderClass (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/join.js:92:16), <anonymous>:29:30)
13 verbose stack at Promise.eval (eval at thenCallback (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/join.js:14:16), <anonymous>:6:20)
13 verbose stack at Promise._settlePromise (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:566:21)
13 verbose stack at Promise._settlePromise0 (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:614:10)
13 verbose stack at Promise._settlePromises (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:693:18)
13 verbose stack at Promise._fulfill (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:638:18)
13 verbose stack at Promise._settlePromise (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:582:21)
13 verbose stack at Promise._settlePromise0 (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:614:10)
13 verbose stack at Promise._settlePromises (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:693:18)
13 verbose stack at Promise._fulfill (/usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/promise.js:638:18)
13 verbose stack at /usr/local/lib/node_modules/npm/node_modules/bluebird/js/release/nodeback.js:42:21
14 verbose cwd /Users/
15 verbose Darwin 17.3.0
16 verbose argv "/usr/local/Cellar/node/8.9.1/bin/node" "/usr/local/bin/npm" "install"
17 verbose node v8.9.1
18 verbose npm v5.5.1
19 error Unexpected string in JSON at position 493
20 verbose exit [ 1, true ]
所以很明显问题出现在bluebird内。我尝试更新它但它没有帮助，似乎唯一的方法是删除本地副本。这似乎是babel的依赖，所以我不认为删除它是正确的方法。还有其他方法可以解决这个问题吗？
编辑所以我使用rm -rf /usr/local/lib/node_modules/npm/node_modules/bluebird从我的系统中删除了bluebird的本地副本，但是当我尝试使用npm install bluebird再次安装它时，我收到错误{{ 1}} MODULE_NOT_FOUND