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import fs from 'fs/promises'
import path from 'path'
import url from 'url'
import type { RawSourceMap } from 'next/dist/compiled/source-map08'
import dataUriToBuffer from 'next/dist/compiled/data-uri-to-buffer'
function getSourceMapUrl(fileContents: string): string | null {
const regex = /\/\/[#@] ?sourceMappingURL=([^\s'"]+)\s*$/gm
let match = null
for (;;) {
let next = regex.exec(fileContents)
if (next == null) {
break
}
match = next
}
if (!(match && match[1])) {
return null
}
return match[1].toString()
}
export async function getSourceMapFromFile(
filename: string
): Promise<RawSourceMap | undefined> {
filename = filename.startsWith('file://')
? url.fileURLToPath(filename)
: filename
let fileContents: string
try {
fileContents = await fs.readFile(filename, 'utf-8')
} catch (error) {
throw new Error(`Failed to read file contents of ${filename}.`, {
cause: error,
})
}
const sourceUrl = getSourceMapUrl(fileContents)
if (!sourceUrl) {
return undefined
}
if (sourceUrl.startsWith('data:')) {
let buffer: dataUriToBuffer.MimeBuffer
try {
buffer = dataUriToBuffer(sourceUrl)
} catch (error) {
throw new Error(`Failed to parse source map URL for ${filename}.`, {
cause: error,
})
}
if (buffer.type !== 'application/json') {
throw new Error(
`Unknown source map type for ${filename}: ${buffer.typeFull}.`
)
}
try {
return JSON.parse(buffer.toString())
} catch (error) {
throw new Error(`Failed to parse source map for ${filename}.`, {
cause: error,
})
}
}
const sourceMapFilename = path.resolve(
path.dirname(filename),
decodeURIComponent(sourceUrl)
)
try {
const sourceMapContents = await fs.readFile(sourceMapFilename, 'utf-8')
return JSON.parse(sourceMapContents.toString())
} catch (error) {
throw new Error(`Failed to parse source map ${sourceMapFilename}.`, {
cause: error,
})
}
}
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