polymer-build/lib/inject-babel-helpers.js

"use strict";
/**
 * @license
 * Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at
 * http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at
 * http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at
 * http://polymer.github.io/PATENTS.txt
 */
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __asyncValues = (this && this.__asyncValues) || function (o) {
    if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
    var m = o[Symbol.asyncIterator], i;
    return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
    if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
    var g = generator.apply(thisArg, _arguments || []), i, q = [];
    return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
    function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
    function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
    function fulfill(value) { resume("next", value); }
    function reject(value) { resume("throw", value); }
    function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
Object.defineProperty(exports, "__esModule", { value: true });
const html_transform_1 = require("./html-transform");
const streams_1 = require("./streams");
/**
 * When compiling to ES5 we need to inject Babel's helpers into a global so
 * that they don't need to be included with each compiled file.
 */
class BabelHelpersInjector extends streams_1.AsyncTransformStream {
    constructor(entrypoint) {
        super({ objectMode: true });
        this.entrypoint = entrypoint;
    }
    _transformIter(files) {
        return __asyncGenerator(this, arguments, function* _transformIter_1() {
            var e_1, _a;
            try {
                for (var files_1 = __asyncValues(files), files_1_1; files_1_1 = yield __await(files_1.next()), !files_1_1.done;) {
                    const file = files_1_1.value;
                    yield yield __await(yield __await(this.processFile(file)));
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (files_1_1 && !files_1_1.done && (_a = files_1.return)) yield __await(_a.call(files_1));
                }
                finally { if (e_1) throw e_1.error; }
            }
        });
    }
    processFile(file) {
        return __awaiter(this, void 0, void 0, function* () {
            if (file.path !== this.entrypoint) {
                return file;
            }
            const contents = yield streams_1.getFileContents(file);
            const transformed = html_transform_1.htmlTransform(contents, { injectBabelHelpers: 'full' });
            const newFile = file.clone();
            newFile.contents = Buffer.from(transformed, 'utf-8');
            return newFile;
        });
    }
}
exports.BabelHelpersInjector = BabelHelpersInjector;
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