Code golf submission - Roman Numerals

Reads numbers (separated by newlines) from an absolute file path passed in on command line.
Outputs the numbers as Roman numerals to the console.
Should be 253 characters.

Author: lukeskrzypek-sf

Luke Skrzypek Submission/README.md

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+Requires node to be installed.
+
+
+Usage:
+`node RomanNumerals.js <FullInputFilePath>`

Luke Skrzypek Submission/RomanNumerals.js

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+o=require('fs')
+F=(n,f,i,d)=>n<4?f.repeat(n):n==4?f+i:n<9?i+f.repeat(n-5):f+d
+o.readFileSync(process.argv[2],'utf8').split('\n').forEach(x=>{n=-(-x)
+console.log('M'.repeat(n/1e3|0)+F(n/100%10|0,'C','D','M')+F(n/10%10|0,'X','L','C')+F(n%10|0,'I','V','X'))})