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utils.js
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utils.js
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const rename = require('@now/build-utils/fs/rename.js')
/** @typedef { import('@now/build-utils/file-ref') } FileRef */
/** @typedef { import('@now/build-utils/file-fs-ref') } FileFsRef */
/** @typedef {{[filePath: string]: FileRef|FileFsRef}} Files */
/**
* Validate if the entrypoint is allowed to be used
* @param {string} entrypoint
* @throws {Error}
*/
function validateEntrypoint (entrypoint) {
if (
!/package\.json$/.exec(entrypoint) &&
!/nuxt\.config\.js$/.exec(entrypoint)
) {
throw new Error(
'Specified "src" for "@now/nuxt" has to be "package.json" or "nuxt.config.js"'
)
}
}
/**
* This callback type is called `requestCallback` and is displayed as a global symbol.
*
* @callback matcher
* @param {string} filePath
* @returns {boolean}
*/
/**
* Exclude certain files from the files object
* @param {Files} files
* @param {matcher} matcher
* @returns {Files}
*/
function excludeFiles (files, matcher) {
return Object.keys(files).reduce((newFiles, filePath) => {
if (matcher(filePath)) {
return newFiles
}
return {
...newFiles,
[filePath]: files[filePath]
}
}, {})
}
/**
* Creates a new Files object holding only the entrypoint files
* @param {Files} files
* @param {string} entryDirectory
* @returns {Files}
*/
function includeOnlyEntryDirectory (files, entryDirectory) {
if (entryDirectory === '.') {
return files
}
function matcher (filePath) {
return !filePath.startsWith(entryDirectory)
}
return excludeFiles(files, matcher)
}
/**
* Moves all files under the entry directory to the root directory
* @param {Files} files
* @param {string} entryDirectory
* @returns {Files}
*/
function moveEntryDirectoryToRoot (files, entryDirectory) {
if (entryDirectory === '.') {
return files
}
function delegate (filePath) {
return filePath.replace(new RegExp(`^${entryDirectory}/`), '')
}
return rename(files, delegate)
}
/**
* Exclude package manager lockfiles from files
* @param {Files} files
* @returns {Files}
*/
function excludeLockFiles (files) {
const newFiles = files
if (newFiles['package-lock.json']) {
delete newFiles['package-lock.json']
}
if (newFiles['yarn.lock']) {
delete newFiles['yarn.lock']
}
return files
}
/**
* Exclude the static directory from files
* @param {Files} files
* @returns {Files}
*/
function excludeStaticDirectory (files) {
function matcher (filePath) {
return filePath.startsWith('static')
}
return excludeFiles(files, matcher)
}
/**
* Exclude the static directory from files
* @param {Files} files
* @returns {Files}
*/
function onlyStaticDirectory (files) {
function matcher (filePath) {
return !filePath.startsWith('static')
}
return excludeFiles(files, matcher)
}
/**
* Enforce specific package.json configuration for smallest possible lambda
* @param {{dependencies?: any, devDependencies?: any, scripts?: any}} defaultPackageJson
*/
function normalizePackageJson (defaultPackageJson = {}) {
const dependencies = {};
const devDependencies = {
...defaultPackageJson.dependencies,
...defaultPackageJson.devDependencies,
};
if (devDependencies.nuxt) {
dependencies['nuxt-start'] = devDependencies.nuxt;
delete devDependencies.nuxt;
}
return {
...defaultPackageJson,
dependencies: {
// react and react-dom can be overwritten
'nuxt-start': 'latest',
...dependencies, // override react if user provided it
},
devDependencies: {
...devDependencies,
},
scripts: {
...defaultPackageJson.scripts,
'now-build': 'nuxt build --no-generate'
}
}
}
module.exports = {
excludeFiles,
validateEntrypoint,
includeOnlyEntryDirectory,
moveEntryDirectoryToRoot,
excludeLockFiles,
normalizePackageJson,
excludeStaticDirectory,
onlyStaticDirectory
}