55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.getUserCodeFrame = getUserCodeFrame;
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// We try to load node dependencies
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let chalk = null;
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let readFileSync = null;
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let codeFrameColumns = null;
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try {
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const nodeRequire = module && module.require;
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readFileSync = nodeRequire.call(module, 'fs').readFileSync;
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codeFrameColumns = nodeRequire.call(module, '@babel/code-frame').codeFrameColumns;
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chalk = nodeRequire.call(module, 'chalk');
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} catch {
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// We're in a browser environment
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}
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// frame has the form "at myMethod (location/to/my/file.js:10:2)"
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function getCodeFrame(frame) {
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const locationStart = frame.indexOf('(') + 1;
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const locationEnd = frame.indexOf(')');
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const frameLocation = frame.slice(locationStart, locationEnd);
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const frameLocationElements = frameLocation.split(':');
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const [filename, line, column] = [frameLocationElements[0], parseInt(frameLocationElements[1], 10), parseInt(frameLocationElements[2], 10)];
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let rawFileContents = '';
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try {
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rawFileContents = readFileSync(filename, 'utf-8');
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} catch {
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return '';
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}
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const codeFrame = codeFrameColumns(rawFileContents, {
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start: {
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line,
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column
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}
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}, {
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highlightCode: true,
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linesBelow: 0
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});
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return `${chalk.dim(frameLocation)}\n${codeFrame}\n`;
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}
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function getUserCodeFrame() {
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// If we couldn't load dependencies, we can't generate the user trace
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/* istanbul ignore next */
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if (!readFileSync || !codeFrameColumns) {
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return '';
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}
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const err = new Error();
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const firstClientCodeFrame = err.stack.split('\n').slice(1) // Remove first line which has the form "Error: TypeError"
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.find(frame => !frame.includes('node_modules/')); // Ignore frames from 3rd party libraries
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return getCodeFrame(firstClientCodeFrame);
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}
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