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node_modules/buble/register.js

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+var fs = require( 'fs' );
+var path = require( 'path' );
+var crypto = require( 'crypto' );
+var homedir = require( 'os-homedir' );
+var buble = require( './' );
+
+var original = require.extensions[ '.js' ];
+var nodeModulesPattern = path.sep === '/' ? /\/node_modules\// : /\\node_modules\\/;
+
+var nodeVersion = /(?:0\.)?\d+/.exec( process.version )[0];
+var versions = [ '0.10', '0.12', '4', '5', '6' ];
+
+if ( !~versions.indexOf( nodeVersion ) ) {
+	if ( +nodeVersion > 6 ) {
+		nodeVersion = 6;
+	} else {
+		throw new Error( 'Unsupported version (' + nodeVersion + '). Please raise an issue at https://gitlab.com/Rich-Harris/buble/issues' );
+	}
+}
+
+var options = {
+	target: {
+		node: nodeVersion
+	}
+};
+
+function mkdirp ( dir ) {
+	var parent = path.dirname( dir );
+	if ( dir === parent ) return;
+	mkdirp( parent );
+
+	try {
+		fs.mkdirSync( dir );
+	} catch ( err ) {
+		if ( err.code !== 'EEXIST' ) throw err;
+	}
+}
+
+var home = homedir();
+if ( home ) {
+	var cachedir = path.join( home, '.buble-cache', nodeVersion );
+	mkdirp( cachedir );
+	fs.writeFileSync( path.join( home, '.buble-cache/README.txt' ), 'These files enable a faster startup when using buble/register. You can safely delete this folder at any time. See https://buble.surge.sh/guide/ for more information.' );
+}
+
+require.extensions[ '.js' ] = function ( m, filename ) {
+	if ( nodeModulesPattern.test( filename ) ) return original( m, filename );
+
+	var source = fs.readFileSync( filename, 'utf-8' );
+	var hash = crypto.createHash( 'sha256' );
+	hash.update( source );
+	var key = hash.digest( 'hex' ) + '.json';
+	var cachepath = path.join( cachedir, key );
+
+	var compiled;
+
+	if ( cachedir ) {
+		try {
+			compiled = JSON.parse( fs.readFileSync( cachepath, 'utf-8' ) );
+		} catch ( err ) {
+			// noop
+		}
+	}
+
+	if ( !compiled ) {
+		try {
+			compiled = buble.transform( source, options );
+
+			if ( cachedir ) {
+				fs.writeFileSync( cachepath, JSON.stringify( compiled ) );
+			}
+		} catch ( err ) {
+			if ( err.snippet ) {
+				console.log( 'Error compiling ' + filename + ':\n---' );
+				console.log( err.snippet );
+				console.log( err.message );
+				console.log( '' )
+				process.exit( 1 );
+			}
+
+			throw err;
+		}
+	}
+
+	m._compile( '"use strict";\n' + compiled.code, filename );
+};