142 lines
6.2 KiB
JavaScript
142 lines
6.2 KiB
JavaScript
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/*
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* Extension to detect ES6 and auto-load Traceur or Babel for processing
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*/
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(function() {
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// good enough ES6 module detection regex - format detections not designed to be accurate, but to handle the 99% use case
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var esmRegEx = /(^\s*|[}\);\n]\s*)(import\s*(['"]|(\*\s+as\s+)?[^"'\(\)\n;]+\s*from\s*['"]|\{)|export\s+\*\s+from\s+["']|export\s*(\{|default|function|class|var|const|let|async\s+function))/;
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var traceurRuntimeRegEx = /\$traceurRuntime\s*\./;
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var babelHelpersRegEx = /babelHelpers\s*\./;
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hook('translate', function(translate) {
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return function(load) {
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var loader = this;
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return translate.call(loader, load)
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.then(function(source) {
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// detect & transpile ES6
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if (load.metadata.format == 'esm' || load.metadata.format == 'es6' || !load.metadata.format && source.match(esmRegEx)) {
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if (load.metadata.format == 'es6')
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warn.call(loader, 'Module ' + load.name + ' has metadata setting its format to "es6", which is deprecated.\nThis should be updated to "esm".');
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load.metadata.format = 'esm';
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if (loader.transpiler === false) {
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// we accept translation to esm for builds though to enable eg rollup optimizations
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if (loader.builder)
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return source;
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throw new TypeError('Unable to dynamically transpile ES module as SystemJS.transpiler set to false.');
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}
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// setting _loader.loadedTranspiler = false tells the next block to
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// do checks for setting transpiler metadata
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loader._loader.loadedTranspiler = loader._loader.loadedTranspiler || false;
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if (loader.pluginLoader)
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loader.pluginLoader._loader.loadedTranspiler = loader._loader.loadedTranspiler || false;
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// do transpilation
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return (loader._loader.transpilerPromise || (
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loader._loader.transpilerPromise = Promise.resolve(
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__global[loader.transpiler == 'typescript' ? 'ts' : loader.transpiler] || (loader.pluginLoader || loader)['import'](loader.transpiler)
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))).then(function(transpiler) {
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loader._loader.loadedTranspilerRuntime = true;
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// translate hooks means this is a transpiler plugin instead of a raw implementation
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if (transpiler.translate) {
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// if transpiler is the same as the plugin loader, then don't run twice
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if (transpiler == load.metadata.loaderModule)
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return load.source;
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// convert the source map into an object for transpilation chaining
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if (typeof load.metadata.sourceMap == 'string')
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load.metadata.sourceMap = JSON.parse(load.metadata.sourceMap);
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return Promise.resolve(transpiler.translate.call(loader, load))
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.then(function(source) {
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// sanitize sourceMap if an object not a JSON string
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var sourceMap = load.metadata.sourceMap;
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if (sourceMap && typeof sourceMap == 'object') {
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var originalName = load.name.split('!')[0];
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// force set the filename of the original file
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sourceMap.file = originalName + '!transpiled';
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// force set the sources list if only one source
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if (!sourceMap.sources || sourceMap.sources.length <= 1)
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sourceMap.sources = [originalName];
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}
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if (load.metadata.format == 'esm' && !loader.builder && detectRegisterFormat(source))
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load.metadata.format = 'register';
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return source;
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});
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}
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// legacy builder support
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if (loader.builder)
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load.metadata.originalSource = load.source;
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// defined in es6-module-loader/src/transpile.js
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return transpile.call(loader, load)
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.then(function(source) {
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// clear sourceMap as transpiler embeds it
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load.metadata.sourceMap = undefined;
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return source;
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});
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});
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}
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// skip transpiler and transpiler runtime loading when transpiler is disabled
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if (loader.transpiler === false)
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return source;
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// load the transpiler correctly
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if (loader._loader.loadedTranspiler === false && (loader.transpiler == 'traceur' || loader.transpiler == 'typescript' || loader.transpiler == 'babel')
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&& load.name == loader.normalizeSync(loader.transpiler)) {
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// always load transpiler as a global
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if (source.length > 100 && !load.metadata.format) {
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load.metadata.format = 'global';
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if (loader.transpiler === 'traceur')
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load.metadata.exports = 'traceur';
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if (loader.transpiler === 'typescript')
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load.metadata.exports = 'ts';
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}
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loader._loader.loadedTranspiler = true;
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}
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// load the transpiler runtime correctly
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if (loader._loader.loadedTranspilerRuntime === false) {
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if (load.name == loader.normalizeSync('traceur-runtime')
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|| load.name == loader.normalizeSync('babel/external-helpers*')) {
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if (source.length > 100)
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load.metadata.format = load.metadata.format || 'global';
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loader._loader.loadedTranspilerRuntime = true;
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}
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}
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// detect transpiler runtime usage to load runtimes
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if ((load.metadata.format == 'register' || load.metadata.bundle) && loader._loader.loadedTranspilerRuntime !== true) {
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if (!__global.$traceurRuntime && load.source.match(traceurRuntimeRegEx)) {
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loader._loader.loadedTranspilerRuntime = loader._loader.loadedTranspilerRuntime || false;
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return loader['import']('traceur-runtime').then(function() {
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return source;
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});
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}
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if (!__global.babelHelpers && load.source.match(babelHelpersRegEx)) {
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loader._loader.loadedTranspilerRuntime = loader._loader.loadedTranspilerRuntime || false;
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return loader['import']('babel/external-helpers').then(function() {
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return source;
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});
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}
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}
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return source;
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});
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};
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});
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})();
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