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fix: move sourcemapping source out of the sourcemap #2443

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Dec 6, 2022
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fix: move sourcemapping source out of the sourcemap #2443

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17 changes: 10 additions & 7 deletions packages/vite-node/src/source-map.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,21 +9,24 @@ interface InstallSourceMapSupportOptions {
let SOURCEMAPPING_URL = 'sourceMa'
SOURCEMAPPING_URL += 'ppingURL'

const VITE_NODE_SOURCEMAPPING_URL = `${SOURCEMAPPING_URL}=data:application/json;charset=utf-8;source=vite-node`
const VITE_NODE_SOURCEMAPPING_SOURCE = '//# sourceMappingSource=vite-node'
const VITE_NODE_SOURCEMAPPING_URL = `${SOURCEMAPPING_URL}=data:application/json;charset=utf-8`
const VITE_NODE_SOURCEMAPPING_REGEXP = new RegExp(`//# ${VITE_NODE_SOURCEMAPPING_URL};base64,(.+)`)
const OTHER_SOURCE_MAP_REGEXP = new RegExp(`//# ${SOURCEMAPPING_URL}=data:application/json[^,]+base64,(.+)`)

export async function withInlineSourcemap(result: TransformResult) {
const { code, map } = result
const map = result.map
let code = result.code

if (!map || code.includes(VITE_NODE_SOURCEMAPPING_URL))
if (!map || code.includes(VITE_NODE_SOURCEMAPPING_SOURCE))
return result

// to reduce the payload size, we only inline vite node source map, because it's also the only one we use
if (OTHER_SOURCE_MAP_REGEXP.test(code))
result.code = code.replace(OTHER_SOURCE_MAP_REGEXP, '')
const OTHER_SOURCE_MAP_REGEXP = new RegExp(`//# ${SOURCEMAPPING_URL}=data:application/json[^,]+base64,(.+)`, 'g')
while (OTHER_SOURCE_MAP_REGEXP.test(code))
code = code.replace(OTHER_SOURCE_MAP_REGEXP, '')

result.code = `${code}\n\n//# ${VITE_NODE_SOURCEMAPPING_URL};base64,${Buffer.from(JSON.stringify(map), 'utf-8').toString('base64')}\n`
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
}
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