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- const tty = require('node:tty');
- // eslint-disable-next-line no-warning-comments
- // TODO: Use a better method when it's added to Node.js (https://github.com/nodejs/node/pull/40240)
- // Lots of optionals here to support Deno.
- const hasColors = tty?.WriteStream?.prototype?.hasColors?.() ?? false;
- const format = (open, close) => {
- if (!hasColors) {
- return input => input;
- }
- const openCode = `\u001B[${open}m`;
- const closeCode = `\u001B[${close}m`;
- return input => {
- const string = input + ''; // eslint-disable-line no-implicit-coercion -- This is faster.
- let index = string.indexOf(closeCode);
- if (index === -1) {
- // Note: Intentionally not using string interpolation for performance reasons.
- return openCode + string + closeCode;
- }
- // Handle nested colors.
- // We could have done this, but it's too slow (as of Node.js 22).
- // return openCode + string.replaceAll(closeCode, openCode) + closeCode;
- let result = openCode;
- let lastIndex = 0;
- while (index !== -1) {
- result += string.slice(lastIndex, index) + openCode;
- lastIndex = index + closeCode.length;
- index = string.indexOf(closeCode, lastIndex);
- }
- result += string.slice(lastIndex) + closeCode;
- return result;
- };
- };
- const colors = {};
- colors.reset = format(0, 0);
- colors.bold = format(1, 22);
- colors.dim = format(2, 22);
- colors.italic = format(3, 23);
- colors.underline = format(4, 24);
- colors.overline = format(53, 55);
- colors.inverse = format(7, 27);
- colors.hidden = format(8, 28);
- colors.strikethrough = format(9, 29);
- colors.black = format(30, 39);
- colors.red = format(31, 39);
- colors.green = format(32, 39);
- colors.yellow = format(33, 39);
- colors.blue = format(34, 39);
- colors.magenta = format(35, 39);
- colors.cyan = format(36, 39);
- colors.white = format(37, 39);
- colors.gray = format(90, 39);
- colors.bgBlack = format(40, 49);
- colors.bgRed = format(41, 49);
- colors.bgGreen = format(42, 49);
- colors.bgYellow = format(43, 49);
- colors.bgBlue = format(44, 49);
- colors.bgMagenta = format(45, 49);
- colors.bgCyan = format(46, 49);
- colors.bgWhite = format(47, 49);
- colors.bgGray = format(100, 49);
- colors.redBright = format(91, 39);
- colors.greenBright = format(92, 39);
- colors.yellowBright = format(93, 39);
- colors.blueBright = format(94, 39);
- colors.magentaBright = format(95, 39);
- colors.cyanBright = format(96, 39);
- colors.whiteBright = format(97, 39);
- colors.bgRedBright = format(101, 49);
- colors.bgGreenBright = format(102, 49);
- colors.bgYellowBright = format(103, 49);
- colors.bgBlueBright = format(104, 49);
- colors.bgMagentaBright = format(105, 49);
- colors.bgCyanBright = format(106, 49);
- colors.bgWhiteBright = format(107, 49);
- module.exports = colors;
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