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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 { 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, chalk, 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, chalk))
}
// 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, chalk))
} else if (peerConflict && peerConflict.current) {
out.push('Found: ' + explainNode(peerConflict.current, depth, chalk))
} else if (currentEdge) {
out.push('Found: ' + explainEdge(currentEdge, depth, chalk))
} else /* istanbul ignore else - should always have one */ if (edge) {
out.push('Found: ' + explainEdge(edge, depth, chalk))
}
out.push('\nCould not resolve dependency:\n' +
explainEdge(edge, depth, chalk))
if (peerConflict) {
const heading = '\nConflicting peer dependency:'
const pc = explainNode(peerConflict.peer, depth, chalk)
out.push(heading + ' ' + pc)
}
return out.join('\n')
}
// generate a full verbose report and tell the user how to fix it
const report = (expl, chalk, noColorChalk) => {
const flags = [
expl.strictPeerDeps ? '--no-strict-peer-deps' : '',
'--force',
'--legacy-peer-deps',
].filter(Boolean)
const or = (arr) => arr.length <= 2
? arr.join(' or ') :
arr.map((v, i, l) => i + 1 === l.length ? `or ${v}` : v).join(', ')
const fix = `Fix the upstream dependency conflict, or retry
this command with ${or(flags)}
to accept an incorrect (and potentially broken) dependency resolution.`
return {
explanation: `${explain(expl, chalk, 4)}\n\n${fix}`,
file: `# npm resolution error report\n\n${explain(expl, noColorChalk, Infinity)}\n\n${fix}`,
}
}
module.exports = {
explain,
report,
}