fix(env): respect =true/false as env values for boolean flags (#4228)

Author: pavelfeldman

src/install/installer.ts

@@ -22,7 +22,7 @@ import * as removeFolder from 'rimraf';
 import * as lockfile from 'proper-lockfile';
 import * as browserPaths from '../utils/browserPaths';
 import * as browserFetcher from './browserFetcher';
-import { getFromENV } from '../utils/utils';
+import { getAsBooleanFromENV } from '../utils/utils';
 
 const fsMkdirAsync = util.promisify(fs.mkdir.bind(fs));
 const fsReaddirAsync = util.promisify(fs.readdir.bind(fs));
@@ -34,7 +34,7 @@ const removeFolderAsync = util.promisify(removeFolder);
 
 export async function installBrowsersWithProgressBar(packagePath: string) {
   // PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD should have a value of 0 or 1
-  if (!!Number(getFromENV('PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD'))) {
+  if (getAsBooleanFromENV('PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD')) {
     browserFetcher.logPolitely('Skipping browsers download because `PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD` env variable is set');
     return false;
   }

src/utils/utils.ts

@@ -95,13 +95,18 @@ export function isUnderTest(): boolean {
   return _isUnderTest;
 }
 
-export function getFromENV(name: string) {
+export function getFromENV(name: string): string | undefined {
   let value = process.env[name];
-  value = typeof value === 'undefined' ? process.env[`npm_config_${name.toLowerCase()}`] : value;
-  value = typeof value === 'undefined' ?  process.env[`npm_package_config_${name.toLowerCase()}`] : value;
+  value = value === undefined ? process.env[`npm_config_${name.toLowerCase()}`] : value;
+  value = value === undefined ?  process.env[`npm_package_config_${name.toLowerCase()}`] : value;
   return value;
 }
 
+export function getAsBooleanFromENV(name: string): boolean {
+  const value = getFromENV(name);
+  return !!value && value !== 'false' && value !== '0';
+}
+
 export async function mkdirIfNeeded(filePath: string) {
   // This will harmlessly throw on windows if the dirname is the root directory.
   await mkdirAsync(path.dirname(filePath), {recursive: true}).catch(() => {});