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formatWebpackMessages.js
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formatWebpackMessages.js
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/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
const friendlySyntaxErrorLabel = 'Syntax error:';
function isLikelyASyntaxError(message) {
return message.indexOf(friendlySyntaxErrorLabel) !== -1;
}
// Cleans up webpack error messages.
function formatMessage(message) {
let lines = [];
if (typeof message === 'string') {
lines = message.split('\n');
} else if ('message' in message) {
lines = message['message'].split('\n');
} else if (Array.isArray(message)) {
message.forEach(message => {
if ('message' in message) {
lines = message['message'].split('\n');
}
});
}
// Strip webpack-added headers off errors/warnings
// https://github.com/webpack/webpack/blob/master/lib/ModuleError.js
lines = lines.filter(line => !/Module [A-z ]+\(from/.test(line));
// Transform parsing error into syntax error
// TODO: move this to our ESLint formatter?
lines = lines.map(line => {
const parsingError = /Line (\d+):(?:(\d+):)?\s*Parsing error: (.+)$/.exec(
line
);
if (!parsingError) {
return line;
}
const [, errorLine, errorColumn, errorMessage] = parsingError;
return `${friendlySyntaxErrorLabel} ${errorMessage} (${errorLine}:${errorColumn})`;
});
message = lines.join('\n');
// Smoosh syntax errors (commonly found in CSS)
message = message.replace(
/SyntaxError\s+\((\d+):(\d+)\)\s*(.+?)\n/g,
`${friendlySyntaxErrorLabel} $3 ($1:$2)\n`
);
// Clean up export errors
message = message.replace(
/^.*export '(.+?)' was not found in '(.+?)'.*$/gm,
`Attempted import error: '$1' is not exported from '$2'.`
);
message = message.replace(
/^.*export 'default' \(imported as '(.+?)'\) was not found in '(.+?)'.*$/gm,
`Attempted import error: '$2' does not contain a default export (imported as '$1').`
);
message = message.replace(
/^.*export '(.+?)' \(imported as '(.+?)'\) was not found in '(.+?)'.*$/gm,
`Attempted import error: '$1' is not exported from '$3' (imported as '$2').`
);
lines = message.split('\n');
// Remove leading newline
if (lines.length > 2 && lines[1].trim() === '') {
lines.splice(1, 1);
}
// Clean up file name
lines[0] = lines[0].replace(/^(.*) \d+:\d+-\d+$/, '$1');
// Cleans up verbose "module not found" messages for files and packages.
if (lines[1] && lines[1].indexOf('Module not found: ') === 0) {
lines = [
lines[0],
lines[1]
.replace('Error: ', '')
.replace('Module not found: Cannot find file:', 'Cannot find file:'),
];
}
// Add helpful message for users trying to use Sass for the first time
if (lines[1] && lines[1].match(/Cannot find module.+sass/)) {
lines[1] = 'To import Sass files, you first need to install sass.\n';
lines[1] +=
'Run `npm install sass` or `yarn add sass` inside your workspace.';
}
message = lines.join('\n');
// Internal stacks are generally useless so we strip them... with the
// exception of stacks containing `webpack:` because they're normally
// from user code generated by webpack. For more information see
// https://github.com/facebook/create-react-app/pull/1050
message = message.replace(
/^\s*at\s((?!webpack:).)*:\d+:\d+[\s)]*(\n|$)/gm,
''
); // at ... ...:x:y
message = message.replace(/^\s*at\s<anonymous>(\n|$)/gm, ''); // at <anonymous>
lines = message.split('\n');
// Remove duplicated newlines
lines = lines.filter(
(line, index, arr) =>
index === 0 || line.trim() !== '' || line.trim() !== arr[index - 1].trim()
);
// Reassemble the message
message = lines.join('\n');
return message.trim();
}
function formatWebpackMessages(json) {
const formattedErrors = json.errors.map(formatMessage);
const formattedWarnings = json.warnings.map(formatMessage);
const result = { errors: formattedErrors, warnings: formattedWarnings };
if (result.errors.some(isLikelyASyntaxError)) {
// If there are any syntax errors, show just them.
result.errors = result.errors.filter(isLikelyASyntaxError);
}
return result;
}
module.exports = formatWebpackMessages;