Fast wc -l <filename> promise for node.js.
(from Emil Vikström SO answer to Node.js: Count the number of lines in a file)
var wcL = require('unix-wc-l')
wcL('test.txt').then((nlines) => {
console.log(`test.txt has ${nlines} lines`)
})
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wc -l for node from SO (https://stackoverflow.com/a/41439945)
gpryor/unix-wc-l
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