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update-root-package-json.js
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update-root-package-json.js
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const fs = require('fs')
const promisify = require('util').promisify
const readFile = promisify(fs.readFile)
const writeFile = promisify(fs.writeFile)
const {resolve} = require('path')
const parseJSON = require('json-parse-even-better-errors')
const { orderDeps } = require('./dep-spec.js')
const depTypes = new Set([
'dependencies',
'optionalDependencies',
'devDependencies',
'peerDependencies',
])
const parseJsonSafe = json => {
try {
return parseJSON(json)
} catch (er) {
return null
}
}
const updateRootPackageJson = async tree => {
const filename = resolve(tree.path, 'package.json')
const originalJson = await readFile(filename, 'utf8').catch(() => null)
const originalContent = parseJsonSafe(originalJson)
const depsData = orderDeps({
...tree.package,
})
// optionalDependencies don't need to be repeated in two places
if (depsData.dependencies) {
if (depsData.optionalDependencies) {
for (const name of Object.keys(depsData.optionalDependencies))
delete depsData.dependencies[name]
}
if (Object.keys(depsData.dependencies).length === 0)
delete depsData.dependencies
}
// if there's no package.json, just use internal pkg info as source of truth
// clone the object though, so we can still refer to what it originally was
const packageJsonContent = !originalContent ? depsData
: Object.assign({}, originalContent)
// loop through all types of dependencies and update package json content
for (const type of depTypes)
packageJsonContent[type] = depsData[type]
// if original package.json had dep in peerDeps AND deps, preserve that.
const { dependencies: origProd, peerDependencies: origPeer } =
originalContent || {}
const { peerDependencies: newPeer } = packageJsonContent
if (origProd && origPeer && newPeer) {
// we have original prod/peer deps, and new peer deps
// copy over any that were in both in the original
for (const name of Object.keys(origPeer)) {
if (origProd[name] !== undefined && newPeer[name] !== undefined) {
packageJsonContent.dependencies = packageJsonContent.dependencies || {}
packageJsonContent.dependencies[name] = newPeer[name]
}
}
}
// format content
const {
[Symbol.for('indent')]: indent,
[Symbol.for('newline')]: newline,
} = tree.package
const format = indent === undefined ? ' ' : indent
const eol = newline === undefined ? '\n' : newline
const content = (JSON.stringify(packageJsonContent, null, format) + '\n')
.replace(/\n/g, eol)
if (content !== originalJson)
return writeFile(filename, content)
}
module.exports = updateRootPackageJson