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import { join } from 'path';
import { transform } from 'babel-core';
import { INLINE, RUNTIME, BUNDLED } from './constants.js';
import importHelperPlugin from './helperPlugin.js';
let preflightCheckResults = {};
export default function preflightCheck ( options, dir ) {
if ( !preflightCheckResults[ dir ] ) {
let helpers;
options = Object.assign( {}, options );
delete options.only;
delete options.ignore;
options.filename = join( dir, 'x.js' );
options.plugins = options.plugins ? options.plugins.concat( importHelperPlugin ) : [ importHelperPlugin ];
const check = transform( 'export default class Foo {}', options ).code;
if ( !~check.indexOf( 'export default' ) && !~check.indexOf( 'export { Foo as default }' ) ) throw new Error( 'It looks like your Babel configuration specifies a module transformer. Please disable it. See https://github.com/rollup/rollup-plugin-babel#configuring-babel for more information' );
if ( ~check.indexOf( 'import _classCallCheck from' ) ) helpers = RUNTIME;
else if ( ~check.indexOf( 'function _classCallCheck' ) ) helpers = INLINE;
else if ( ~check.indexOf( 'babelHelpers' ) ) helpers = BUNDLED;
else {
throw new Error( 'An unexpected situation arose. Please raise an issue at https://github.com/rollup/rollup-plugin-babel/issues. Thanks!' );
}
preflightCheckResults[ dir ] = helpers;
}
return preflightCheckResults[ dir ];
}
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