1 | var fs = require('fs');
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2 | var path = require('path');
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3 | var crypto = require('crypto');
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4 | var homedir = require('os').homedir;
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5 | var buble = require('./');
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6 |
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7 | var original = require.extensions[ '.js' ];
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8 | var nodeModulesPattern = path.sep === '/' ? /\/node_modules\// : /\\node_modules\\/;
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9 |
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10 | var nodeVersion = /(?:0\.)?\d+/.exec(process.version)[0];
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11 | var versions = [ '0.10', '0.12', '4', '5', '6' ];
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12 |
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13 | if (!~versions.indexOf(nodeVersion)) {
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14 | if (+nodeVersion > 6) {
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15 | nodeVersion = '6';
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16 | } else {
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17 | throw new Error('Unsupported version (' + nodeVersion + '). Please raise an issue at https://github.com/bublejs/buble/issues');
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18 | }
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19 | }
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20 |
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21 | var options = {
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22 | target: {
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23 | node: nodeVersion
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24 | }
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25 | };
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26 |
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27 | function mkdirp (dir) {
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28 | var parent = path.dirname(dir);
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29 | if (dir === parent) return;
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30 | mkdirp(parent);
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31 |
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32 | try {
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33 | fs.mkdirSync(dir);
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34 | } catch (err) {
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35 | if (err.code !== 'EEXIST') throw err;
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36 | }
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37 | }
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38 |
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39 | var home = homedir();
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40 | if (home) {
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41 | var cachedir = path.join(home, '.buble-cache', String(nodeVersion));
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42 | mkdirp(cachedir);
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43 | 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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44 | }
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45 |
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46 | var optionsStringified = JSON.stringify(options);
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47 |
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48 | require.extensions[ '.js' ] = function (m, filename) {
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49 | if (nodeModulesPattern.test(filename)) return original(m, filename);
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50 |
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51 | var source = fs.readFileSync(filename, 'utf-8');
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52 | var hash = crypto.createHash('sha256');
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53 | hash.update(buble.VERSION);
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54 | hash.update(optionsStringified);
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55 | hash.update(source);
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56 | var key = hash.digest('hex') + '.json';
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57 | var cachepath = path.join(cachedir, key);
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58 |
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59 | var compiled;
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60 |
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61 | if (cachedir) {
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62 | try {
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63 | compiled = JSON.parse(fs.readFileSync(cachepath, 'utf-8'));
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64 | } catch (err) {
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65 |
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66 | }
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67 | }
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68 |
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69 | if (!compiled) {
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70 | try {
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71 | compiled = buble.transform(source, options);
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72 |
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73 | if (cachedir) {
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74 | fs.writeFileSync(cachepath, JSON.stringify(compiled));
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75 | }
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76 | } catch (err) {
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77 | if (err.snippet) {
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78 | console.log('Error compiling ' + filename + ':\n---');
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79 | console.log(err.snippet);
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80 | console.log(err.message);
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81 | console.log('');
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82 | process.exit(1);
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83 | }
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84 |
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85 | throw err;
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86 | }
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87 | }
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88 |
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89 | m._compile('"use strict";\n' + compiled.code, filename);
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90 | };
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