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// this is called when an ERESOLVE error is caught in the exit-handler,
// or when there's a log.warn('eresolve', msg, explanation), to turn it
// into a human-intelligible explanation of what's wrong and how to fix.
const { writeFileSync } = require('fs')
const { explainEdge, explainNode, printNode } = require('./explain-dep.js')
// expl is an explanation object that comes from Arborist. It looks like:
// Depth is how far we want to want to descend into the object making a report.
// The full report (ie, depth=Infinity) is always written to the cache folder
// at ${cache}/eresolve-report.txt along with full json.
const explain = (expl, color, depth) => {
const { edge, dep, current, peerConflict, currentEdge } = expl
const out = []
const whileInstalling = dep && dep.whileInstalling ||
current && current.whileInstalling ||
edge && edge.from && edge.from.whileInstalling
if (whileInstalling)
out.push('While resolving: ' + printNode(whileInstalling, color))
// it "should" be impossible for an ERESOLVE explanation to lack both
// current and currentEdge, but better to have a less helpful error
// than a crashing failure.
if (current)
out.push('Found: ' + explainNode(current, depth, color))
else if (peerConflict && peerConflict.current)
out.push('Found: ' + explainNode(peerConflict.current, depth, color))
else if (currentEdge)
out.push('Found: ' + explainEdge(currentEdge, depth, color))
else /* istanbul ignore else - should always have one */ if (edge)
out.push('Found: ' + explainEdge(edge, depth, color))
out.push('\nCould not resolve dependency:\n' +
explainEdge(edge, depth, color))
if (peerConflict) {
const heading = '\nConflicting peer dependency:'
const pc = explainNode(peerConflict.peer, depth, color)
out.push(heading + ' ' + pc)
}
return out.join('\n')
}
// generate a full verbose report and tell the user how to fix it
const report = (expl, color, fullReport) => {
const orNoStrict = expl.strictPeerDeps ? '--no-strict-peer-deps, ' : ''
const fix = `Fix the upstream dependency conflict, or retry
this command with ${orNoStrict}--force, or --legacy-peer-deps
to accept an incorrect (and potentially broken) dependency resolution.`
writeFileSync(fullReport, `# npm resolution error report
${new Date().toISOString()}
${explain(expl, false, Infinity)}
${fix}
Raw JSON explanation object:
${JSON.stringify(expl, null, 2)}
`, 'utf8')
return explain(expl, color, 4) +
`\n\n${fix}\n\nSee ${fullReport} for a full report.`
}
module.exports = {
explain,
report,
}