util.format seems to insert newline charaters

[bodyslam]

• Version: v11.10.0
• Platform: Linux DESKTOP-B3SR088 4.4.0-17134-Microsoft EventEmitter gets TypeError if EventEmitter.prototype.addListener is called directly.  #523-Microsoft Mon Dec 31 17:49:00 PST 2018 x86_64 x86_64 x86_64 GNU/Linux
• Subsystem: util.format

For arrays of length 30 or greater newline characters are inserted

example

const test31 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1];
const test20 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0];

> util.format(test20)
'[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 ]'
> util.format(test31)
'[ 1,\n  2,\n  3,\n  4,\n  5,\n  6,\n  7,\n  8,\n  9,\n  0,\n  1,\n  2,\n  3,\n  4,\n  5,\n  6,\n  7,\n  8,\n  9,\n  0,\n  1,\n  2,\n  3,\n  4,\n  5,\n  6,\n  7,\n  8,\n  9,\n  0,\n  1 ]'

Originally discovered while debugging buynan (ticket here: trentm/node-bunyan#617)

Is there any way to suppress the newline characters?

[addaleax]

Is there any way to suppress the newline characters?

Yes; see the documentation:

breakLength <integer> The length at which an object's keys are split across multiple lines. Set to Infinity to format an object as a single line.

So util.inspect(test31, { breakLength: Infinity }) does the trick.

[bodyslam]

Thank you so much @addaleax! That did the trick!