Output the BELL character (Unicode 0007) to the standard output.
console.log('\u0007');
Update 2023
Solution above doesn’t work anymore, but writing directly to stdout still works (tested on Node.js v14.20):
process.stdout.write('\u0007');
References
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ASCII/ISO 8859 (Latin-1) Table
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Unicode Characters: 00000 to 000FF
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The Open Group Base Specifications Issue 7: Portable Character Set
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Programming with Unicode Documentation (unicodebook.pdf)
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How a bullet turns into a beep – The Old New Thing
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Unicode 10.0.0 Final Names List