/**
 * 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';
Object.defineProperty(exports, "__esModule", { value: true });
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;
}
exports.default = formatWebpackMessages;
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