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index.js
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index.js
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#!/usr/bin/env node
'use strict';
const meow = require('meow');
const stackTraceParser = require('stacktrace-parser');
const fs = require('fs-extra');
const { basename, join, resolve } = require('path');
const sourceMap = require('source-map');
const { getStdin } = require('get-stdin');
function formatStackFrame(frame) {
const { file, methodName, lineNumber, column } = frame;
const parts = [];
parts.push('at ');
if (methodName) {
parts.push(methodName);
}
if (file) {
parts.push(' (');
parts.push(file);
if (lineNumber && column) {
parts.push(':');
parts.push(column);
parts.push(':');
parts.push(lineNumber);
}
parts.push(')');
}
return parts.join('');
}
class SourceMapRegistry {
// Map of "basename" -> "fullpath"
sourceMapFiles = new Map();
// Map of "basename" -> "source map consumer for source map file"
sourceMaps = new Map();
async getSourceMapConsumer(path) {
const key = basename(path) + '.map';
const fullPath = this.sourceMapFiles.get(key);
let smc = this.sourceMaps.get(key);
if (!smc && fullPath) {
// Acquire smc
const mapContent = fs.readJSONSync(fullPath, 'utf-8');
smc = await new sourceMap.SourceMapConsumer(mapContent);
this.sourceMaps.set(key, smc);
}
return smc;
}
initialize(path) {
this.sourceMapFiles = new Map();
this.sourceMaps = new Map();
const stat = fs.lstatSync(path);
if (stat.isFile()) {
this.sourceMapFiles.set(basename(path), path);
} else {
this.findFiles(path).forEach(each => this.sourceMapFiles.set(basename(each), each));
}
}
findFiles(folder) {
const results = []
// Get all files from the folder
let items = fs.readdirSync(folder);
// Loop through the results, possibly recurse
for (const item of items) {
try {
const fullPath = join(folder, item)
if (fs.statSync(fullPath).isDirectory()) {
// Its a folder, recursively get the child folders' files
results.push(...(this.findFiles(fullPath)))
} else {
// Filter by the file name pattern, if there is one
if (item.search(new RegExp('.*\.js\.map', 'i')) > -1) {
results.push(resolve(fullPath))
}
}
} catch (error) {
// Ignore!
}
}
return results
}
}
const cli = meow(`
Usage
$ stackmapsource <map-path>
Examples
$ echo "TypeError h is…" | stackmapsource /path/to/source-maps
`);
(async () => {
try {
// Determine path of source maps
let mapPath = cli.input[0];
if (!mapPath) mapPath = process.execPath;
// Create registry
const registry = new SourceMapRegistry();
registry.initialize(mapPath);
// Acquire stacktrace
let str = await getStdin();
// Parse stacktrace
const stack = stackTraceParser.parse(str);
if (stack.length === 0) throw new Error('No stack found');
// Print "header" (usually message of what went wrong, eg. message of Error)
const header = str.split('\n').find(line => line.trim().length > 0);
if (header && !header.includes(stack[0].file)) {
process.stdout.write(`${header}\n`);
}
// Translate stacktrace
for (const each of stack) {
const { file, methodName, lineNumber, column } = each;
try {
if (lineNumber == null || lineNumber < 1) {
process.stdout.write(` at ${methodName || ''}\n`);
} else {
const smc = await registry.getSourceMapConsumer(file);
if (smc && typeof smc.originalPositionFor === 'function') {
const pos = smc && smc.originalPositionFor({ line: lineNumber, column }) || undefined;
if (pos && pos.line != null) {
process.stdout.write(` at ${pos.name || ''} (${pos.source}:${pos.line}:${pos.column})\n`);
} else {
process.stdout.write(` ${formatStackFrame(each)}\n`);
}
} else {
process.stdout.write(` ${formatStackFrame(each)}\n`);
}
}
} catch (err) {
process.stdout.write(` at FAILED_TO_PARSE_LINE\n`, err);
}
}
} catch (err) {
console.error(err);
}
})();