MaxListenersExceededWarning when use postinstall

[keenwon]

os: Manjaro Linux x86_64
node: 10.1.0
npm: 6.1.0 ([email protected])

I create a "postinstall script" in node_modules/.hooks, and then run npm install

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/asap
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/encoding
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/fbjs/node_modules/core-js
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/foreach
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/function-bind
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/has
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/is-callable
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/is-date-object
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall
(node:32402) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGINT listeners added. Use emitter.setMaxListeners() to increase limit

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/is-regex
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

> [email protected] postinstall /home/keenwon/Test/ci-test/node_modules/is-symbol
> /home/keenwon/Test/ci-test/node_modules/.hooks/postinstall

# ....

[mattshin]

This was noticed in #11 and fixed in #36