[cli] Add --no-color mode (#8826)

Co-authored-by: Sean Massa <EndangeredMassa@gmail.com>
Co-authored-by: Chris Barber <chris.barber@vercel.com>

packages/cli/src/util/output/create-output.ts

@@ -5,12 +5,14 @@ import renderLink from './link';
 import wait, { StopSpinner } from './wait';
 import type { WritableTTY } from '../../types';
 import { errorToString } from '@vercel/error-utils';
+import { removeEmoji } from '../emoji';
 
 const IS_TEST = process.env.NODE_ENV === 'test';
 
 export interface OutputOptions {
   debug?: boolean;
   supportsHyperlink?: boolean;
+  noColor?: boolean;
 }
 
 export interface LogOptions {
@@ -25,6 +27,7 @@ export class Output {
   stream: WritableTTY;
   debugEnabled: boolean;
   supportsHyperlink: boolean;
+  colorDisabled: boolean;
   private spinnerMessage: string;
   private _spinner: StopSpinner | null;
 
@@ -33,6 +36,7 @@ export class Output {
     {
       debug: debugEnabled = false,
       supportsHyperlink = detectSupportsHyperlink(stream),
+      noColor = false,
     }: OutputOptions = {}
   ) {
     this.stream = stream;
@@ -40,6 +44,11 @@ export class Output {
     this.supportsHyperlink = supportsHyperlink;
     this.spinnerMessage = '';
     this._spinner = null;
+
+    this.colorDisabled = getNoColor(noColor);
+    if (this.colorDisabled) {
+      chalk.level = 0;
+    }
   }
 
   isDebugEnabled = () => {
@@ -47,6 +56,9 @@ export class Output {
   };
 
   print = (str: string) => {
+    if (this.colorDisabled) {
+      str = removeEmoji(str);
+    }
     this.stopSpinner();
     this.stream.write(str);
   };
@@ -203,3 +215,14 @@ export class Output {
     return ansiEscapes.link(chalk.cyan(text), url);
   };
 }
+
+function getNoColor(noColorArg: boolean | undefined): boolean {
+  // FORCE_COLOR: the standard supported by chalk https://github.com/chalk/chalk#supportscolor
+  // NO_COLOR: the standard we want to support https://no-color.org/
+  // noColorArg: the `--no-color` arg passed to the CLI command
+  const noColor =
+    process.env.FORCE_COLOR === '0' ||
+    process.env.NO_COLOR === '1' ||
+    noColorArg;
+  return !!noColor;
+}