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next.js/taskfile-babel.js

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// taskr babel plugin with Babel 7 support
// https://github.com/lukeed/taskr/pull/305
'use strict'
const transform = require('@babel/core').transform
const flatten = require('flatten')
const BABEL_REGEX = /(^@babel\/)(preset|plugin)-(.*)/i
function getBabels () {
const pkg = require('./package.json')
return flatten(
['devDependencies', 'dependencies'].map(s => Object.keys(pkg[s] || {}))
).filter(s => BABEL_REGEX.test(s))
}
module.exports = function (task) {
let cache
task.plugin('babel', {}, function * (file, opts) {
if (opts.preload) {
delete opts.preload
// get dependencies
cache = cache || getBabels()
// attach any deps to babel's `opts`
cache.forEach(dep => {
const segs = BABEL_REGEX.exec(dep)
const type = `${segs[2]}s`
const name = `@babel/${segs[2]}-${segs[3]}`
opts[type] = opts[type] || []
// flatten all (advanced entries are arrays)
if (flatten(opts[type]).indexOf(name) === -1) {
opts[type] = opts[type].concat(name)
}
})
}
// attach file's name
opts.filename = file.base
const output = transform(file.data, opts)
if (output.map) {
const map = `${file.base}.map`
// append `sourceMappingURL` to original file
if (opts.sourceMaps !== 'both') {
output.code += Buffer.from(`\n//# sourceMappingURL=${map}`)
}
// add sourcemap to `files` array
this._.files.push({
base: map,
dir: file.dir,
data: Buffer.from(JSON.stringify(output.map))
})
}
// update file's data
file.data = Buffer.from(output.code)
})
}