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fix: a pretty error when browser executable is not found (#3220)

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Make sure executable exists before launching it. If it doesn't and
we were launched without custom executable path, print a helpful
instruction to run `npm i playwright` and get browsers downloaded.

Note: there's already a test that makes sure bad executable paths
are treated fairly: 9132d23b2b/test/launcher.jest.js (L54-L59)

This doesn't test missing default browser installation which I think is
fine.

Fixes #3161
This commit is contained in:
Andrey Lushnikov 2020-07-29 23:16:24 -07:00 committed by GitHub
parent ae0c3a6d00
commit e09132527d
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1 changed files with 8 additions and 0 deletions
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8
src/server/browserType.ts
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@ -55,6 +55,7 @@ export interface BrowserType {
const mkdirAsync = util.promisify(fs.mkdir);
const mkdtempAsync = util.promisify(fs.mkdtemp);
const existsAsync = (path: string): Promise<boolean> => new Promise(resolve => fs.stat(path, err => resolve(!err)));
const DOWNLOADS_FOLDER = path.join(os.tmpdir(), 'playwright_downloads-');
type WebSocketNotPipe = { webSocketRegex: RegExp, stream: 'stdout' | 'stderr' };
@ -190,6 +191,13 @@ export abstract class BrowserTypeBase implements BrowserType {
const executable = executablePath || this.executablePath();
if (!executable)
throw new Error(`No executable path is specified. Pass "executablePath" option directly.`);
if (!(await existsAsync(executable))) {
const errorMessageLines = [`Failed to launch ${this._name} because executable doesn't exist at ${executable}`];
// If we tried using stock downloaded browser, suggest re-installing playwright.
if (!executablePath)
errorMessageLines.push(`Try re-installing playwright with "npm install playwright"`);
throw new Error(errorMessageLines.join('\n'));
}
if (!executablePath) {
// We can only validate dependencies for bundled browsers.