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| require("./polyfill");
var sourceMapSupport = require("source-map-support");
var roadrunner = require("roadrunner");
var util = require("./util");
var to5 = require("./index");
var fs = require("fs");
var _ = require("lodash");
sourceMapSupport.install({
retrieveSourceMap: function (source) {
var map = maps && maps[source];
if (map) {
return {
url: null,
map: map
};
} else {
return null;
}
}
});
//
var blacklist = [];
var blacklistTest = function (transformer, code) {
try {
if (_.isFunction(code)) {
code();
} else {
new Function(code);
}
blacklist.push(transformer);
} catch (err) {
Iif (err.name !== "SyntaxError") throw err;
}
};
blacklistTest("arrayComprehension", "var foo = [for (foo of bar) foo * foo];");
blacklistTest("generatorComprehension", "var foo = (for (foo of bar) foo * foo)");
blacklistTest("arrowFunctions", "var foo = x => x * x;");
blacklistTest("classes", "class Foo {}");
blacklistTest("computedPropertyNames", "var foo = { [foo]: bar };");
blacklistTest("constants", function () {
try {
new Function("const foo = 'foo';\nfoo = 'wow';");
} catch (err) {
return; // constants are supported
}
throw new SyntaxError;
});
blacklistTest("defaultParamaters", "var foo = function (bar = 0) {};");
blacklistTest("destructuring", "var { x, y } = { x: 0, y: 0 };");
blacklistTest("forOf", "for (var foo of bar) {}");
blacklistTest("generators", "function* foo() {}\nasync function bar() {}"); // generators/async functions delegated to same transformer
blacklistTest("letScoping", "let foo = 0;");
blacklistTest("modules", 'import foo from "from";');
blacklistTest("propertyMethodAssignment", "{ get foo() {} }");
blacklistTest("propertyNameShorthand", "var foo = { x, y };");
blacklistTest("restParameters", "function foo(...bar) {}");
blacklistTest("spread", "foo(...bar);");
blacklistTest("templateLiterals", "var foo = `foo`;");
blacklistTest("unicodeRegex", function () { new RegExp("foo", "u"); });
//
var transformOpts = {};
var ignoreRegex = /node_modules/;
var onlyRegex;
var whitelist = [];
var cache;
var exts = {};
var maps = {};
var old = require.extensions[".js"];
var mtime = function (filename) {
return +fs.statSync(filename).mtime;
};
var loader = function (m, filename) {
if ((ignoreRegex && ignoreRegex.test(filename)) || (onlyRegex && !onlyRegex.test(filename))) {
return old.apply(this, arguments);
}
var result;
Iif (cache) {
var cached = cache[filename];
if (cached && cached.mtime === mtime(filename)) {
result = cached;
}
}
result = result || to5.transformFileSync(filename, _.extend({
whitelist: whitelist,
blacklist: blacklist,
sourceMap: true,
ast: false
}, transformOpts));
Iif (cache) {
result.mtime = mtime(filename);
cache[filename] = result;
}
maps[filename] = result.map;
m._compile(result.code, filename);
};
var hookExtensions = function (_exts) {
_.each(exts, function (old, ext) {
require.extensions[ext] = old;
});
exts = {};
_.each(_exts, function (ext) {
exts[ext] = require.extensions[ext];
require.extensions[ext] = loader;
});
};
hookExtensions([".es6", ".es", ".js"]);
module.exports = function (opts) {
// normalise options
opts = opts || {};
Iif (_.isRegExp(opts)) opts = { ignore: opts };
Iif (opts.ignoreRegex != null) opts.ignore = opts.ignoreRegex;
Iif (opts.only != null) onlyRegex = util.regexify(opts.only);
Iif (opts.ignore != null) ignoreRegex = util.regexify(opts.ignore);
Iif (opts.extensions) hookExtensions(util.arrayify(opts.extensions));
Iif (opts.cache) cache = opts.cache;
Iif (opts.cache === false) cache = null;
Iif (opts.cache === true) {
roadrunner.load();
roadrunner.setup();
cache = roadrunner.get("6to5");
}
_.extend(transformOpts, opts);
};
|