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source-map.ts
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source-map.ts
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import type { TransformResult } from 'vite'
import { dirname, isAbsolute, relative, resolve } from 'pathe'
import { withTrailingSlash } from './utils'
import { install } from './source-map-handler'
import type { EncodedSourceMap } from './types'
interface InstallSourceMapSupportOptions {
getSourceMap: (source: string) => EncodedSourceMap | null | undefined
}
let SOURCEMAPPING_URL = 'sourceMa'
SOURCEMAPPING_URL += 'ppingURL'
const VITE_NODE_SOURCEMAPPING_SOURCE = '//# sourceMappingSource=vite-node'
const VITE_NODE_SOURCEMAPPING_URL = `${SOURCEMAPPING_URL}=data:application/json;charset=utf-8`
const VITE_NODE_SOURCEMAPPING_REGEXP = new RegExp(`//# ${VITE_NODE_SOURCEMAPPING_URL};base64,(.+)`)
export function withInlineSourcemap(result: TransformResult, options: {
root: string // project root path of this resource
filepath: string
}) {
const map = result.map
let code = result.code
if (!map || code.includes(VITE_NODE_SOURCEMAPPING_SOURCE))
return result
if ('sources' in map) {
map.sources = map.sources?.map((source) => {
if (!source)
return source
// sometimes files here are absolute,
// but they are considered absolute to the server url, not the file system
// this is a bug in Vite
// all files should be either absolute to the file system or relative to the source map file
if (isAbsolute(source)) {
const actualPath = (!source.startsWith(withTrailingSlash(options.root)) && source.startsWith('/'))
? resolve(options.root, source.slice(1))
: source
return relative(dirname(options.filepath), actualPath)
}
return source
})
}
// to reduce the payload size, we only inline vite node source map, because it's also the only one we use
const OTHER_SOURCE_MAP_REGEXP = new RegExp(`//# ${SOURCEMAPPING_URL}=data:application/json[^,]+base64,([A-Za-z0-9+/=]+)$`, 'gm')
while (OTHER_SOURCE_MAP_REGEXP.test(code))
code = code.replace(OTHER_SOURCE_MAP_REGEXP, '')
// If the first line is not present on source maps, add simple 1:1 mapping ([0,0,0,0], [1,0,0,0])
// so that debuggers can be set to break on first line
if (map.mappings.startsWith(';'))
map.mappings = `AAAA,CAAA${map.mappings}`
const sourceMap = Buffer.from(JSON.stringify(map), 'utf-8').toString('base64')
result.code = `${code.trimEnd()}\n\n${VITE_NODE_SOURCEMAPPING_SOURCE}\n//# ${VITE_NODE_SOURCEMAPPING_URL};base64,${sourceMap}\n`
return result
}
export function extractSourceMap(code: string): EncodedSourceMap | null {
const mapString = code.match(VITE_NODE_SOURCEMAPPING_REGEXP)?.[1]
if (mapString)
return JSON.parse(Buffer.from(mapString, 'base64').toString('utf-8'))
return null
}
export function installSourcemapsSupport(options: InstallSourceMapSupportOptions) {
install({
retrieveSourceMap(source) {
const map = options.getSourceMap(source)
if (map) {
return {
url: source,
map,
}
}
return null
},
})
}