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next.js/server/lib/source-map-support.js

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// @flow
const filenameRE = /\(([^)]+\.js):(\d+):(\d+)\)$/
export async function applySourcemaps (e: any): Promise<void> {
if (!e || typeof e.stack !== 'string' || e.sourceMapsApplied) {
return
}
const lines = e.stack.split('\n')
const result = await Promise.all(lines.map((line) => {
return rewriteTraceLine(line)
}))
e.stack = result.join('\n')
// This is to make sure we don't apply the sourcemaps twice on the same object
e.sourceMapsApplied = true
}
async function rewriteTraceLine (trace: string): Promise<string> {
const m = trace.match(filenameRE)
if (m == null) {
return trace
}
const filePath = m[1]
const mapPath = `${filePath}.map`
// Load these on demand.
const fs = require('fs')
const promisify = require('./promisify')
const readFile = promisify(fs.readFile)
const access = promisify(fs.access)
try {
await access(mapPath, (fs.constants || fs).R_OK)
} catch (err) {
return trace
}
const mapContents = await readFile(mapPath)
const {SourceMapConsumer} = require('source-map')
const map = new SourceMapConsumer(JSON.parse(mapContents))
const originalPosition = map.originalPositionFor({
line: Number(m[2]),
column: Number(m[3])
})
if (originalPosition.source != null) {
const { source, line, column } = originalPosition
const mappedPosition = `(${source.replace(/^webpack:\/\/\//, '')}:${String(line)}:${String(column)})`
return trace.replace(filenameRE, mappedPosition)
}
return trace
}