87 lines
2.2 KiB
JavaScript
87 lines
2.2 KiB
JavaScript
var fs = require( 'fs' );
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var path = require( 'path' );
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var crypto = require( 'crypto' );
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var homedir = require( 'os-homedir' );
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var buble = require( './' );
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var original = require.extensions[ '.js' ];
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var nodeModulesPattern = path.sep === '/' ? /\/node_modules\// : /\\node_modules\\/;
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var nodeVersion = /(?:0\.)?\d+/.exec( process.version )[0];
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var versions = [ '0.10', '0.12', '4', '5', '6' ];
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if ( !~versions.indexOf( nodeVersion ) ) {
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if ( +nodeVersion > 6 ) {
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nodeVersion = 6;
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} else {
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throw new Error( 'Unsupported version (' + nodeVersion + '). Please raise an issue at https://gitlab.com/Rich-Harris/buble/issues' );
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}
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}
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var options = {
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target: {
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node: nodeVersion
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}
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};
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function mkdirp ( dir ) {
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var parent = path.dirname( dir );
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if ( dir === parent ) return;
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mkdirp( parent );
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try {
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fs.mkdirSync( dir );
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} catch ( err ) {
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if ( err.code !== 'EEXIST' ) throw err;
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}
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}
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var home = homedir();
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if ( home ) {
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var cachedir = path.join( home, '.buble-cache', nodeVersion );
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mkdirp( cachedir );
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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.' );
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}
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require.extensions[ '.js' ] = function ( m, filename ) {
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if ( nodeModulesPattern.test( filename ) ) return original( m, filename );
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var source = fs.readFileSync( filename, 'utf-8' );
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var hash = crypto.createHash( 'sha256' );
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hash.update( source );
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var key = hash.digest( 'hex' ) + '.json';
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var cachepath = path.join( cachedir, key );
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var compiled;
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if ( cachedir ) {
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try {
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compiled = JSON.parse( fs.readFileSync( cachepath, 'utf-8' ) );
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} catch ( err ) {
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// noop
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}
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}
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if ( !compiled ) {
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try {
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compiled = buble.transform( source, options );
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if ( cachedir ) {
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fs.writeFileSync( cachepath, JSON.stringify( compiled ) );
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}
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} catch ( err ) {
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if ( err.snippet ) {
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console.log( 'Error compiling ' + filename + ':\n---' );
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console.log( err.snippet );
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console.log( err.message );
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console.log( '' )
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process.exit( 1 );
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}
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throw err;
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}
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}
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m._compile( '"use strict";\n' + compiled.code, filename );
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};
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