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format.js
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const { formatWithOptions: baseFormatWithOptions } = require('node:util') // These are most assuredly not a mistake // https://eslint.org/docs/latest/rules/no-control-regex // \x00 through \x1f, \x7f through \x9f, not including \x09 \x0a \x0b \x0d /* eslint-disable-next-line no-control-regex */ const HAS_C01 = /[\x00-\x08\x0c\x0e-\x1f\x7f-\x9f]/ // Allows everything up to '[38;5;255m' in 8 bit notation const ALLOWED_SGR = /^\[[0-9;]{0,8}m/ // '[38;5;255m'.length const SGR_MAX_LEN = 10 // Strips all ANSI C0 and C1 control characters (except for SGR up to 8 bit) function STRIP_C01 (str) { if (!HAS_C01.test(str)) { return str } let result = '' for (let i = 0; i < str.length; i++) { const char = str[i] const code = char.charCodeAt(0) if (!HAS_C01.test(char)) { // Most characters are in this set so continue early if we can result = `${result}${char}` } else if (code === 27 && ALLOWED_SGR.test(str.slice(i + 1, i + SGR_MAX_LEN + 1))) { // \x1b with allowed SGR result = `${result}\x1b` } else if (code <= 31) { // escape all other C0 control characters besides \x7f result = `${result}^${String.fromCharCode(code + 64)}` } else { // hasC01 ensures this is now a C1 control character or \x7f result = `${result}^${String.fromCharCode(code - 64)}` } } return result } const formatWithOptions = ({ prefix: prefixes = [], eol = '\n', ...options }, ...args) => { const prefix = prefixes.filter(p => p != null).join(' ') const formatted = STRIP_C01(baseFormatWithOptions(options, ...args)) // Splitting could be changed to only `\n` once we are sure we only emit unix newlines. // The eol param to this function will put the correct newlines in place for the returned string. const lines = formatted.split(/\r?\n/) return lines.reduce((acc, l) => `${acc}${prefix}${prefix && l ? ' ' : ''}${l}${eol}`, '') } module.exports = { formatWithOptions }