main.js
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/**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
var fs = require("fs");
var through = require("through");
var transform = require("./lib/visit").transform;
var utils = require("./lib/util");
var genOrAsyncFunExp = /\bfunction\s*\*|\basync\b/;
function exports(file, options) {
var data = [];
return through(write, end);
function write(buf) {
data.push(buf);
}
function end() {
try {
this.queue(compile(data.join(""), options).code);
this.queue(null);
} catch (e) { this.emit('error', e); }
}
}
// To get a writable stream for use as a browserify transform, call
// require("regenerator")().
module.exports = exports;
// To include the runtime globally in the current node process, call
// require("regenerator").runtime().
function runtime() {
regeneratorRuntime = require("regenerator-runtime");
}
exports.runtime = runtime;
runtime.path = require("regenerator-runtime/path.js").path;
var cachedRuntimeCode;
function getRuntimeCode() {
return cachedRuntimeCode ||
(cachedRuntimeCode = fs.readFileSync(runtime.path, "utf8"));
}
var transformOptions = {
presets: [require("regenerator-preset")],
parserOpts: {
sourceType: "module",
allowImportExportEverywhere: true,
allowReturnOutsideFunction: true,
allowSuperOutsideMethod: true,
strictMode: false,
plugins: ["*", "jsx", "flow"]
}
};
function compile(source, options) {
var result;
options = utils.defaults(options || {}, {
includeRuntime: false
});
// Shortcut: Transform only if generators or async functions present.
if (genOrAsyncFunExp.test(source)) {
result = require("@babel/core").transformSync(source, transformOptions);
} else {
result = { code: source };
}
if (options.includeRuntime === true) {
result.code = getRuntimeCode() + "\n" + result.code;
}
return result;
}
// Allow packages that depend on Regenerator to use the same copy of
// ast-types, in case multiple versions are installed by NPM.
exports.types = require("recast").types;
// Transforms a string of source code, returning a { code, map? } result.
exports.compile = compile;
// To modify an AST directly, call require("regenerator").transform(ast).
exports.transform = transform;