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'use strict';
const escapeStringRegexp = require('escape-string-regexp');
const ansiStyles = require('ansi-styles');
const stdoutColor = require('supports-color').stdout;

const template = require('./templates.js');

const isSimpleWindowsTerm = process.platform === 'win32' && !(process.env.TERM || '').toLowerCase().startsWith('xterm');

// `supportsColor.level` → `ansiStyles.color[name]` mapping
const levelMapping = ['ansi', 'ansi', 'ansi256', 'ansi16m'];

// `color-convert` models to exclude from the Chalk API due to conflicts and such
const skipModels = new Set(['gray']);

const styles = Object.create(null);

function applyOptions(obj, options) {
	options = options || {};

// Detect level if not set manually
	const scLevel = stdoutColor ? stdoutColor.level : 0;
	obj.level = options.level === undefined ? scLevel : options.level;
	obj.enabled = 'enabled' in options ? options.enabled : obj.level > 0;
}

function Chalk(options) {
	// We check for this.template here since calling `chalk.constructor()`
	// by itself will have a `this` of a previously constructed chalk object
	if (!this || !(this instanceof Chalk) || this.template) {
		const chalk = {};
		applyOptions(chalk, options);

chalk.template = function () {
			const args = [].slice.call(arguments);
			return chalkTag.apply(null, [chalk.template].concat(args));
		};

Object.setPrototypeOf(chalk, Chalk.prototype);
		Object.setPrototypeOf(chalk.template, chalk);

chalk.template.constructor = Chalk;

return chalk.template;
	}

applyOptions(this, options);
}

// Use bright blue on Windows as the normal blue color is illegible
if (isSimpleWindowsTerm) {
	ansiStyles.blue.open = '\u001B[94m';
}

for (const key of Object.keys(ansiStyles)) {
	ansiStyles[key].closeRe = new RegExp(escapeStringRegexp(ansiStyles[key].close), 'g');

styles[key] = {
		get() {
			const codes = ansiStyles[key];
			return build.call(this, this._styles ? this._styles.concat(codes) : [codes], this._empty, key);
		}
	};
}

styles.visible = {
	get() {
		return build.call(this, this._styles || [], true, 'visible');
	}
};

ansiStyles.color.closeRe = new RegExp(escapeStringRegexp(ansiStyles.color.close), 'g');
for (const model of Object.keys(ansiStyles.color.ansi)) {
	if (skipModels.has(model)) {
		continue;
	}

styles[model] = {
		get() {
			const level = this.level;
			return function () {
				const open = ansiStyles.color[levelMapping[level]][model].apply(null, arguments);
				const codes = {
					open,
					close: ansiStyles.color.close,
					closeRe: ansiStyles.color.closeRe
				};
				return build.call(this, this._styles ? this._styles.concat(codes) : [codes], this._empty, model);
			};
		}
	};
}

ansiStyles.bgColor.closeRe = new RegExp(escapeStringRegexp(ansiStyles.bgColor.close), 'g');
for (const model of Object.keys(ansiStyles.bgColor.ansi)) {
	if (skipModels.has(model)) {
		continue;
	}

const proto = Object.defineProperties(() => {}, styles);

function build(_styles, _empty, key) {
	const builder = function () {
		return applyStyle.apply(builder, arguments);
	};

builder._styles = _styles;
	builder._empty = _empty;

const self = this;

Object.defineProperty(builder, 'level', {
		enumerable: true,
		get() {
			return self.level;
		},
		set(level) {
			self.level = level;
		}
	});

Object.defineProperty(builder, 'enabled', {
		enumerable: true,
		get() {
			return self.enabled;
		},
		set(enabled) {
			self.enabled = enabled;
		}
	});

// See below for fix regarding invisible grey/dim combination on Windows
	builder.hasGrey = this.hasGrey || key === 'gray' || key === 'grey';

// `__proto__` is used because we must return a function, but there is
	// no way to create a function with a different prototype
	builder.__proto__ = proto; // eslint-disable-line no-proto

return builder;
}

function applyStyle() {
	// Support varags, but simply cast to string in case there's only one arg
	const args = arguments;
	const argsLen = args.length;
	let str = String(arguments[0]);

if (argsLen === 0) {
		return '';
	}

if (argsLen > 1) {
		// Don't slice `arguments`, it prevents V8 optimizations
		for (let a = 1; a < argsLen; a++) {
			str += ' ' + args[a];
		}
	}

if (!this.enabled || this.level <= 0 || !str) {
		return this._empty ? '' : str;
	}

// Turns out that on Windows dimmed gray text becomes invisible in cmd.exe,
	// see https://github.com/chalk/chalk/issues/58
	// If we're on Windows and we're dealing with a gray color, temporarily make 'dim' a noop.
	const originalDim = ansiStyles.dim.open;
	if (isSimpleWindowsTerm && this.hasGrey) {
		ansiStyles.dim.open = '';
	}

for (const code of this._styles.slice().reverse()) {
		// Replace any instances already present with a re-opening code
		// otherwise only the part of the string until said closing code
		// will be colored, and the rest will simply be 'plain'.
		str = code.open + str.replace(code.closeRe, code.open) + code.close;

// Close the styling before a linebreak and reopen
		// after next line to fix a bleed issue on macOS
		// https://github.com/chalk/chalk/pull/92
		str = str.replace(/\r?\n/g, `${code.close}$&${code.open}`);
	}

// Reset the original `dim` if we changed it to work around the Windows dimmed gray issue
	ansiStyles.dim.open = originalDim;

return str;
}

function chalkTag(chalk, strings) {
	if (!Array.isArray(strings)) {
		// If chalk() was called by itself or with a string,
		// return the string itself as a string.
		return [].slice.call(arguments, 1).join(' ');
	}

const args = [].slice.call(arguments, 2);
	const parts = [strings.raw[0]];

for (let i = 1; i < strings.length; i++) {
		parts.push(String(args[i - 1]).replace(/[{}\\]/g, '\\$&'));
		parts.push(String(strings.raw[i]));
	}

return template(chalk, parts.join(''));
}

Object.defineProperties(Chalk.prototype, styles);

module.exports = Chalk(); // eslint-disable-line new-cap
module.exports.supportsColor = stdoutColor;
module.exports.default = module.exports; // For TypeScript

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