60 lines
1.8 KiB
JavaScript
60 lines
1.8 KiB
JavaScript
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"use strict";
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const os = require('os');
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/**
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* Tries to get an excerpt of the file where the error happened.
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* Uses err.line and err.column.
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*
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* Returns an empty string if the excerpt could not be retrieved.
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*
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* @param {LessError} err
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* @returns {Array<string>}
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*/
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function getFileExcerptIfPossible(lessErr) {
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try {
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const excerpt = lessErr.extract.slice(0, 2);
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const column = Math.max(lessErr.column - 1, 0);
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if (typeof excerpt[0] === 'undefined') {
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excerpt.shift();
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}
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excerpt.push(`${new Array(column).join(' ')}^`);
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return excerpt;
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} catch (unexpectedErr) {
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// If anything goes wrong here, we don't want any errors to be reported to the user
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return [];
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}
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}
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/**
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* Beautifies the error message from Less.
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*
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* @param {LessError} lessErr
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* @param {string} lessErr.type - e.g. 'Name'
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* @param {string} lessErr.message - e.g. '.undefined-mixin is undefined'
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* @param {string} lessErr.filename - e.g. '/path/to/style.less'
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* @param {number} lessErr.index - e.g. 352
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* @param {number} lessErr.line - e.g. 31
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* @param {number} lessErr.callLine - e.g. NaN
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* @param {string} lessErr.callExtract - e.g. undefined
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* @param {number} lessErr.column - e.g. 6
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* @param {Array<string>} lessErr.extract - e.g. [' .my-style {', ' .undefined-mixin;', ' display: block;']
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* @returns {LessError}
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*/
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function formatLessError(err) {
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/* eslint-disable no-param-reassign */
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const msg = err.message; // Instruct webpack to hide the JS stack from the console
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// Usually you're only interested in the SASS stack in this case.
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err.hideStack = true;
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err.message = [os.EOL, ...getFileExcerptIfPossible(err), msg.charAt(0).toUpperCase() + msg.slice(1), ` in ${err.filename} (line ${err.line}, column ${err.column})`].join(os.EOL);
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return err;
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}
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/* eslint-enable no-param-reassign */
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module.exports = formatLessError;
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