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105 lines
3.7 KiB
105 lines
3.7 KiB
const fs = require('fs')
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const { SourceMapConsumer } = require('source-map')
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const path = require('path')
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const pify = require('pify')
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const fsAsync = pify(fs)
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//
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// Utility to help check if sourcemaps are working
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//
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// searches `dist/chrome/inpage.js` for "new Error" statements
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// and prints their source lines using the sourcemaps.
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// if not working it may error or print minified garbage
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//
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start().catch(console.error)
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async function start () {
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const targetFiles = [`inpage.js`, `contentscript.js`, `ui.js`, `background.js`]
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for (const buildName of targetFiles) {
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await validateSourcemapForFile({ buildName })
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}
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}
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async function validateSourcemapForFile ({ buildName }) {
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console.log(`build "${buildName}"`)
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const platform = `chrome`
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// load build and sourcemaps
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let rawBuild
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try {
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const filePath = path.join(__dirname, `/../dist/${platform}/`, `${buildName}`)
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rawBuild = await fsAsync.readFile(filePath, 'utf8')
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} catch (err) {}
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if (!rawBuild) {
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throw new Error(`SourcemapValidator - failed to load source file for "${buildName}"`)
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}
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// attempt to load in dist mode
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let rawSourceMap
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try {
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const filePath = path.join(__dirname, `/../dist/sourcemaps/`, `${buildName}.map`)
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rawSourceMap = await fsAsync.readFile(filePath, 'utf8')
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} catch (err) {}
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// attempt to load in dev mode
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try {
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const filePath = path.join(__dirname, `/../dist/${platform}/`, `${buildName}.map`)
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rawSourceMap = await fsAsync.readFile(filePath, 'utf8')
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} catch (err) {}
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if (!rawSourceMap) {
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throw new Error(`SourcemapValidator - failed to load sourcemaps for "${buildName}"`)
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}
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const consumer = await new SourceMapConsumer(rawSourceMap)
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const hasContentsOfAllSources = consumer.hasContentsOfAllSources()
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if (!hasContentsOfAllSources) {
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console.warn('SourcemapValidator - missing content of some sources...')
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}
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console.log(` sampling from ${consumer.sources.length} files`)
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let sampleCount = 0
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const buildLines = rawBuild.split('\n')
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const targetString = 'new Error'
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// const targetString = 'null'
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const matchesPerLine = buildLines.map(line => indicesOf(targetString, line))
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matchesPerLine.forEach((matchIndices, lineIndex) => {
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matchIndices.forEach((matchColumn) => {
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sampleCount++
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const position = { line: lineIndex + 1, column: matchColumn }
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const result = consumer.originalPositionFor(position)
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// warn if source content is missing
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if (!result.source) {
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console.warn(`!! missing source for position: ${JSON.stringify(position)}`)
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// const buildLine = buildLines[position.line - 1]
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console.warn(` origin in build:`)
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console.warn(` ${buildLines[position.line - 2]}`)
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console.warn(`-> ${buildLines[position.line - 1]}`)
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console.warn(` ${buildLines[position.line - 0]}`)
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return
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}
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const sourceContent = consumer.sourceContentFor(result.source)
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const sourceLines = sourceContent.split('\n')
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const line = sourceLines[result.line - 1]
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// this sometimes includes the whole line though we tried to match somewhere in the middle
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const portion = line.slice(result.column)
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const isMaybeValid = portion.includes(targetString)
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if (!isMaybeValid) {
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console.error('Sourcemap seems invalid:')
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console.log(`\n========================== ${result.source} ====================================\n`)
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console.log(line)
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console.log(`\n==============================================================================\n`)
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}
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})
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})
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console.log(` checked ${sampleCount} samples`)
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}
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function indicesOf (substring, string) {
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const a = []
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let i = -1
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while ((i = string.indexOf(substring, i + 1)) >= 0) {
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a.push(i)
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}
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return a
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}
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