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babel-plugin-add-module-to-define.js
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Editing: babel-plugin-add-module-to-define.js
// This file is part of Moodle - http://moodle.org/ // // Moodle is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Moodle is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Moodle. If not, see <http://www.gnu.org/licenses/>. /** * This is a babel plugin to add the Moodle module names to the AMD modules * as part of the transpiling process. * * In addition it will also add a return statement for the default export if the * module is using default exports. This is a highly specific Moodle thing because * we're transpiling to AMD and none of the existing Babel 7 plugins work correctly. * * This will fix the issue where an ES6 module using "export default Foo" will be * transpiled into an AMD module that returns {default: Foo}; Instead it will now * just simply return Foo. * * Note: This means all other named exports in that module are ignored and won't be * exported. * * @copyright 2018 Ryan Wyllie <ryan@moodle.com> * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ "use strict"; /* eslint-env node */ module.exports = ({template, types}) => { const fs = require('fs'); const path = require('path'); const cwd = process.cwd(); const ComponentList = require(path.join(process.cwd(), '.grunt', 'components.js')); /** * Search the list of components that match the given file name * and return the Moodle component for that file, if found. * * Throw an exception if no matching component is found. * * @throws {Error} * @param {string} searchFileName The file name to look for. * @return {string} Moodle component */ function getModuleNameFromFileName(searchFileName) { searchFileName = fs.realpathSync(searchFileName); const relativeFileName = searchFileName.replace(`${cwd}${path.sep}`, '').replace(/\\/g, '/'); const [componentPath, file] = relativeFileName.split('/amd/src/'); const fileName = file.replace('.js', ''); // Check subsystems first which require an exact match. const componentName = ComponentList.getComponentFromPath(componentPath); if (componentName) { return `${componentName}/${fileName}`; } // This matches the previous PHP behaviour that would throw an exception // if it couldn't parse an AMD file. throw new Error(`Unable to find module name for ${searchFileName} (${componentPath}::${file}}`); } /** * This is heavily inspired by the babel-plugin-add-module-exports plugin. * See: https://github.com/59naga/babel-plugin-add-module-exports * * This is used when we detect a module using "export default Foo;" to make * sure the transpiled code just returns Foo directly rather than an object * with the default property (i.e. {default: Foo}). * * Note: This means that we can't support modules that combine named exports * with a default export. * * @param {String} path * @param {String} exportObjectName */ function addModuleExportsDefaults(path, exportObjectName) { const rootPath = path.findParent(path => { return path.key === 'body' || !path.parentPath; }); // HACK: `path.node.body.push` instead of path.pushContainer(due doesn't work in Plugin.post). // This is hardcoded to work specifically with AMD. rootPath.node.body.push(template(`return ${exportObjectName}.default`)()); } return { pre() { this.seenDefine = false; this.addedReturnForDefaultExport = false; }, visitor: { // Plugin ordering is only respected if we visit the "Program" node. // See: https://babeljs.io/docs/en/plugins.html#plugin-preset-ordering // // We require this to run after the other AMD module transformation so // let's visit the "Program" node. Program: { exit(path) { path.traverse({ CallExpression(path) { // If we find a "define" function call. if (!this.seenDefine && path.get('callee').isIdentifier({name: 'define'})) { // We only want to modify the first instance of define that we find. this.seenDefine = true; // Get the Moodle component for the file being processed. var moduleName = getModuleNameFromFileName(this.file.opts.filename); // The function signature of `define()` is: // define = function (name, deps, callback) {...} // Ensure that if the moduel supplied its own name that it is replaced. if (path.node.arguments.length > 0) { // Ensure that there is only one name. if (path.node.arguments[0].type === 'StringLiteral') { // eslint-disable-next-line console.log(`Replacing module name '${path.node.arguments[0].extra.rawValue}' with ${moduleName}`); path.node.arguments.shift(); } } // Add the module name as the first argument to the define function. path.node.arguments.unshift(types.stringLiteral(moduleName)); // Add a space after the define function in the built file so that previous versions // of Moodle will not try to add the module name to the file when it's being served // by PHP. This forces the regex in PHP to not match for this file. path.node.callee.name = 'define '; } // Check for any Object.defineProperty('exports', 'default') calls. if (!this.addedReturnForDefaultExport && path.get('callee').matchesPattern('Object.defineProperty')) { const [identifier, prop] = path.get('arguments'); const objectName = identifier.get('name').node; const propertyName = prop.get('value').node; if ((objectName === 'exports' || objectName === '_exports') && propertyName === 'default') { addModuleExportsDefaults(path, objectName); this.addedReturnForDefaultExport = true; } } }, AssignmentExpression(path) { // Check for an exports.default assignments. if ( !this.addedReturnForDefaultExport && ( path.get('left').matchesPattern('exports.default') || path.get('left').matchesPattern('_exports.default') ) ) { const objectName = path.get('left.object.name').node; addModuleExportsDefaults(path, objectName); this.addedReturnForDefaultExport = true; } } }, this); } } } }; };
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