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let {parse} = require("acorn")

module.exports = function(code) {

let ast

try { ast = parse(code, {sourceType: "module"}) }

catch(_) { return code }

let patches = []

ast.body.forEach(node => {

if (node.type == "VariableDeclaration" && node.kind != "var") {

patches.push({from: node.start, to: node.start + node.kind.length, text: "var"})

} else if (node.type == "ClassDeclaration") {

patches.push({from: node.start, to: node.start, text: "var " + node.id.name + " = "})

} else if (node.type == "ImportDeclaration") {

let req = "require(" + node.source.raw + ")", text

if (node.specifiers.length == 0) {

text = req

} else if (node.specifiers.length > 1 || node.specifiers[0].type == "ImportDefaultSpecifier") {

let name = "m_" + node.source.value.replace(/\W+/g, "_") + "__"

text = "var " + name + " = " + req

node.specifiers.forEach(spec => {

if (spec.type == "ImportDefaultSpecifier")

text += ", " + spec.local.name + " = " + name + ".default || " + name

else if (name != null)

text += ", " + spec.local.name + " = " + name + "." + spec.imported.name

})

} else {

text = "var "

node.specifiers.forEach(spec => {

if (spec.type == "ImportNamespaceSpecifier")

text += spec.local.name + " = " + req

else

text += spec.local.name + " = " + req + "." + spec.imported.name

})

}

patches.push({from: node.start, to: node.end, text: text + ";"})

} else if (node.type == "ExportNamedDeclaration") {

if (node.source || !node.declaration)

patches.push({from: node.start, to: node.end, text: ""})

else

patches.push({from: node.start, to: node.declaration.start, text: ""})

} else if (node.type == "ExportDefaultDeclaration") {

if (/Declaration/.test(node.declaration.type)) {

patches.push({from: node.start, to: node.declaration.start, text: ""})

} else {

patches.push({from: node.start, to: node.declaration.start, text: ";("},

{from: node.declaration.end, text: ")"})

}

} else if (node.type == "ExportAllDeclaration") {

patches.push({from: node.start, to: node.end, text: ""})

}

})

patches.sort((a, b) => a.from - b.from || (a.to || a.from) - (b.to || b.from))

let out = "", pos = 0

patches.forEach(({from, to, text}) => {

out += code.slice(pos, from) + text

pos = to

})

out += code.slice(pos)

return out

}