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const fs = require('fs')
const { SourceMapConsumer } = require('source-map')
//
// Utility to help check if sourcemaps are working
//
// searches `dist/chrome/inpage.js` for "new Error" statements
// and prints their source lines using the sourcemaps.
// if not working it may error or print minified garbage
//
start()
async function start() {
const rawBuild = fs.readFileSync(__dirname + '/../dist/chrome/inpage.js', 'utf8')
const rawSourceMap = fs.readFileSync(__dirname + '/../dist/sourcemaps/inpage.js.map', 'utf8')
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 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
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`)
})
})
}
function indicesOf(substring, string) {
var a=[],i=-1;
while((i=string.indexOf(substring,i+1)) >= 0) a.push(i);
return a;
}
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