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