sourcemaps - enhancement for sourcemap-validator

development/sourcemap-validator.js

@@ -1,6 +1,9 @@
 const fs = require('fs')
 const { SourceMapConsumer } = require('source-map')
 const path = require('path')
+const pify = require('pify')
+const fsAsync = pify(fs)
+
 //
 // Utility to help check if sourcemaps are working
 //
@@ -9,39 +12,85 @@ const path = require('path')
 // if not working it may error or print minified garbage
 //
 
-start()
+start().catch(console.error)
 
 
 async function start () {
-  const rawBuild = fs.readFileSync(path.join(__dirname, '/../dist/chrome/', 'inpage.js')
-  , 'utf8')
-  const rawSourceMap = fs.readFileSync(path.join(__dirname, '/../dist/sourcemaps/', 'inpage.js.map'), 'utf8')
+  const targetFiles = [`inpage.js`, `contentscript.js`, `ui.js`, `background.js`]
+  for (const buildName of targetFiles) {
+    await validateSourcemapForFile({ buildName })
+  }
+}
+
+async function validateSourcemapForFile ({ buildName }) {
+  console.log(`build "${buildName}"`)
+  const platform = `chrome`
+  // load build and sourcemaps
+  let rawBuild
+  try {
+    const filePath = path.join(__dirname, `/../dist/${platform}/`, `${buildName}`)
+    rawBuild = await fsAsync.readFile(filePath, 'utf8')
+  } catch (err) {}
+  if (!rawBuild) {
+    throw new Error(`SourcemapValidator - failed to load source file for "${buildName}"`)
+  }
+  // attempt to load in dist mode
+  let rawSourceMap
+  try {
+    const filePath = path.join(__dirname, `/../dist/sourcemaps/`, `${buildName}.map`)
+    rawSourceMap = await fsAsync.readFile(filePath, 'utf8')
+  } catch (err) {}
+  // attempt to load in dev mode
+  try {
+    const filePath = path.join(__dirname, `/../dist/${platform}/`, `${buildName}.map`)
+    rawSourceMap = await fsAsync.readFile(filePath, 'utf8')
+  } catch (err) {}
+  if (!rawSourceMap) {
+    throw new Error(`SourcemapValidator - failed to load sourcemaps for "${buildName}"`)
+  }
+
   const consumer = await new SourceMapConsumer(rawSourceMap)
 
-  console.log('hasContentsOfAllSources:', consumer.hasContentsOfAllSources(), '\n')
-  console.log('sources:')
-  consumer.sources.map((sourcePath) => console.log(sourcePath))
-
-  console.log('\nexamining "new Error" statements:\n')
-  const sourceLines = rawBuild.split('\n')
-  sourceLines.map(line => indicesOf('new Error', line))
-  .forEach((errorIndices, lineIndex) => {
-    // if (errorIndex === null) return console.log('line does not contain "new Error"')
-    errorIndices.forEach((errorIndex) => {
-      const position = { line: lineIndex + 1, column: errorIndex }
+  const hasContentsOfAllSources = consumer.hasContentsOfAllSources()
+  if (!hasContentsOfAllSources) console.warn('SourcemapValidator - missing content of some sources...')
+
+  console.log(`  sampling from ${consumer.sources.length} files`)
+  let sampleCount = 0
+
+  const buildLines = rawBuild.split('\n')
+  const targetString = 'new Error'
+  // const targetString = 'null'
+  const matchesPerLine = buildLines.map(line => indicesOf(targetString, line))
+  matchesPerLine.forEach((matchIndices, lineIndex) => {
+    matchIndices.forEach((matchColumn) => {
+      sampleCount++
+      const position = { line: lineIndex + 1, column: matchColumn }
       const result = consumer.originalPositionFor(position)
-      if (!result.source) return console.warn(`!! missing source for position: ${position}`)
-      // filter out deps distributed minified without sourcemaps
-      if (result.source === 'node_modules/browserify/node_modules/browser-pack/_prelude.js') return // minified mess
-      if (result.source === 'node_modules/web3/dist/web3.min.js') return // minified mess
+      // warn if source content is missing
+      if (!result.source) {
+        console.warn(`!! missing source for position: ${JSON.stringify(position)}`)
+        // const buildLine = buildLines[position.line - 1]
+        console.warn(`   origin in build:`)
+        console.warn(`   ${buildLines[position.line - 2]}`)
+        console.warn(`-> ${buildLines[position.line - 1]}`)
+        console.warn(`   ${buildLines[position.line - 0]}`)
+        return
+      }
       const sourceContent = consumer.sourceContentFor(result.source)
       const sourceLines = sourceContent.split('\n')
       const line = sourceLines[result.line - 1]
-      console.log(`\n========================== ${result.source} ====================================\n`)
-      console.log(line)
-      console.log(`\n==============================================================================\n`)
+      // this sometimes includes the whole line though we tried to match somewhere in the middle
+      const portion = line.slice(result.column)
+      const isMaybeValid = portion.includes(targetString)
+      if (!isMaybeValid) {
+        console.error('Sourcemap seems invalid:')
+        console.log(`\n========================== ${result.source} ====================================\n`)
+        console.log(line)
+        console.log(`\n==============================================================================\n`)
+      }
     })
   })
+  console.log(`  checked ${sampleCount} samples`)
 }
 
 function indicesOf (substring, string) {