/
enhanceUnexpectedTokenMessage.ts
66 lines (52 loc) · 1.95 KB
/
enhanceUnexpectedTokenMessage.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import chalk = require('chalk');
const DOT = ' \u2022 ';
interface ErrorWithCodeFrame extends Error {
codeFrame?: string;
}
export default function handlePotentialSyntaxError(
e: ErrorWithCodeFrame,
): ErrorWithCodeFrame {
if (e.codeFrame) {
e.stack = e.message + '\n' + e.codeFrame;
}
if (
// `instanceof` might come from the wrong context
e.name === 'SyntaxError' &&
(e.message.includes('Unexpected token') ||
e.message.includes('Cannot use import')) &&
!e.message.includes(' expected')
) {
throw enhanceUnexpectedTokenMessage(e);
}
return e;
}
export function enhanceUnexpectedTokenMessage(e: Error): Error {
e.stack =
`${chalk.bold.red('Jest encountered an unexpected token')}
This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
Here's what you can do:
${DOT}If you are trying to use ECMAScript Modules, see ${chalk.underline(
'https://jestjs.io/docs/en/ecmascript-modules',
)} for how to enable it.
${DOT}To have some of your "node_modules" files transformed, you can specify a custom ${chalk.bold(
'"transformIgnorePatterns"',
)} in your config.
${DOT}If you need a custom transformation specify a ${chalk.bold(
'"transform"',
)} option in your config.
${DOT}If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the ${chalk.bold(
'"moduleNameMapper"',
)} config option.
You'll find more details and examples of these config options in the docs:
${chalk.cyan('https://jestjs.io/docs/en/configuration.html')}
${chalk.bold.red('Details:')}
` + e.stack;
return e;
}