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'use strict'
const indentString = require('indent-string')
const stringifyJson5 = require('json5').stringify
function stringify (json5, value) {
return json5
? stringifyJson5(value, null, 2)
: JSON.stringify(value, null, 2)
}
function generateFactory (unflattened, envName) {
const code = [`${envName ? '()' : 'envName'} => {`]
if (envName) {
const flattenedOptions = unflattened.reduceRight((prev, options) => {
options.env = {
[envName]: prev
}
return options
})
code.push(indentString(`return ${stringify(unflattened.json5, flattenedOptions)}`, 2))
} else {
const optionsCode = unflattened.reduceRight((prev, options, index) => {
const str = stringify(unflattened.json5, options)
if (!prev) return str
// reduceOptions ensures no options object is ever empty.
const lines = str.split('\n')
lines[lines.length - 2] += ','
lines[lines.length - 1] = indentString(`env: {\n [envName]: ${indentString(prev, 2).trimLeft()}\n}`, 2)
return lines.join('\n') + '\n}'
}, null)
code.push(indentString(`return ${optionsCode.trimLeft()}`, 2))
}
code.push('}')
return code.join('\n')
}
function codegen (resolvedConfig) {
const code = [`"use strict"
const process = require("process")\n`]
code.push(`const defaultOptions = ${generateFactory(resolvedConfig.unflattenedDefaultOptions)}\n`)
code.push(`const envOptions = Object.create(null)\n`)
for (const envName of resolvedConfig.envNames) {
const unflattened = resolvedConfig.unflattenedEnvOptions.get(envName)
code.push(`envOptions[${JSON.stringify(envName)}] = ${generateFactory(unflattened, envName)}\n`)
}
code.push(`exports.getOptions = () => {
const envName = process.env.BABEL_ENV || process.env.NODE_ENV || "development"
return envName in envOptions
? envOptions[envName]()
: defaultOptions(envName)
}\n`)
return code.join('\n')
}
module.exports = codegen
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