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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