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const pacote = require('pacote')
const formatDiff = require('./format-diff.js')
const getTarball = require('./tarball.js')
const untar = require('./untar.js')
// TODO: we test this condition in the diff command
// so this error probably doesnt need to be here. Or
// if it does we should figure out a standard code
// so we can catch it in the cli and display it consistently
const argsError = () =>
Object.assign(
new TypeError('libnpmdiff needs two arguments to compare'),
{ code: 'EDIFFARGS' }
)
const diff = async (specs, opts = {}) => {
if (specs.length !== 2) {
throw argsError()
}
const [
aManifest,
bManifest,
] =
await Promise.all(specs.map(spec => pacote.manifest(spec, opts)))
const versions = {
a: aManifest.version,
b: bManifest.version,
}
// fetches tarball using pacote
const [a, b] = await Promise.all([
getTarball(aManifest, opts),
getTarball(bManifest, opts),
])
// read all files
// populates `files` and `refs`
const {
files,
refs,
} = await untar([
{
prefix: 'a/',
item: a,
},
{
prefix: 'b/',
item: b,
},
], opts)
return formatDiff({
files,
opts,
refs,
versions,
})
}
module.exports = diff