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color.ts
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color.ts
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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import * as ansiColors from 'ansi-colors';
import { WriteStream } from 'tty';
type AnsiColors = typeof ansiColors;
function supportColor(): boolean {
if (process.env.FORCE_COLOR !== undefined) {
// 2 colors: FORCE_COLOR = 0 (Disables colors), depth 1
// 16 colors: FORCE_COLOR = 1, depth 4
// 256 colors: FORCE_COLOR = 2, depth 8
// 16,777,216 colors: FORCE_COLOR = 3, depth 16
// See: https://nodejs.org/dist/latest-v12.x/docs/api/tty.html#tty_writestream_getcolordepth_env
// and https://github.com/nodejs/node/blob/b9f36062d7b5c5039498e98d2f2c180dca2a7065/lib/internal/tty.js#L106;
switch (process.env.FORCE_COLOR) {
case '':
case 'true':
case '1':
case '2':
case '3':
return true;
default:
return false;
}
}
if (process.stdout instanceof WriteStream) {
return process.stdout.getColorDepth() > 1;
}
return false;
}
export function removeColor(text: string): string {
// This has been created because when colors.enabled is false unstyle doesn't work
// see: https://github.com/doowb/ansi-colors/blob/a4794363369d7b4d1872d248fc43a12761640d8e/index.js#L38
return text.replace(ansiColors.ansiRegex, '');
}
// Create a separate instance to prevent unintended global changes to the color configuration
// Create function is not defined in the typings. See: https://github.com/doowb/ansi-colors/pull/44
const colors = (ansiColors as AnsiColors & { create: () => AnsiColors }).create();
colors.enabled = supportColor();
export { colors };