Issue in Npm v5.4.0 Which Doesn't Work With Flow Check - Error: Spawn EACCES

Error

4th Sep 2017, Monday. All our node.js builds failed with below error at the step when we run flow check

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> flow check

internal/child_process.js:315
    throw errnoException(err, 'spawn');
    ^
 
Error: spawn EACCES
    at exports._errnoException (util.js:907:11)
    at ChildProcess.spawn (internal/child_process.js:315:11)
    at exports.spawn (child_process.js:365:9)
    at Object.<anonymous> (/opt/app/node_modules/flow-bin/cli.js:17:3)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:140:18)

Cause

First thought it was a flow error of latest version. Downgrade ‘flow-bin’ to previous version didn’t work. It was actually caused by ‘spawn’ calling files with incorrect permissions. internal/child_process.js:315 throw errnoException(err, 'spawn');
NPM v5.4.0 removes executable(+x) permission during installing packages.

Solution

fix npm to v5.3.0 works npm install npm@5.3.0

It’s still an open issue in NPM when I wrote this.
https://github.com/npm/npm/issues/18324