all files / lib/ spire-of-babel.js

100% Statements 73/73
96.15% Branches 25/26
100% Functions 0/0
100% Lines 70/70
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'use strict';
 
const atob = require('atob');
 
const chalk = require('chalk');
 
const babel = require('babel-core');
const browserify = require('browserify');
const babelify = require('babelify');
 
const es2015 = require('babel-preset-es2015');
const react = require('babel-preset-react');
const babili = require('babel-preset-babili');
 
const flowStripTypes = require('babel-plugin-transform-flow-strip-types');
const flowSyntax = require('babel-plugin-syntax-flow');
 
const CLIEngine = require('eslint').CLIEngine;
 
const ESLINT_SEVERITY = {
    '1': chalk.yellow('warning'),
    '2': chalk.red('error')
};
 
const sourceMapPattern = /\/\/# sourceMappingURL=data:application\/json;charset=utf-8;base64,(.*)/;
const sourceMapPatternMatchIndex = 1;
 
const OPTION_DEFAULTS = {
    'bundle': false,
    'minify': false,
    'output': null,
    'sourcemap': false
};
 
const PRESET_DEFAULTS = [es2015, react];
 
/**
 * Transforms a file with babel.
 *
 * @example spire.transformFileWithBabel(file).then(function (result) { console.log(result); });
 * @param {String} file File path.
 * @param {Object} [options] Options object.
 * @param {Boolean} [options.sourcemap] Generate sourcemap.
 * @return {Object} Promise
 * @public
 */
 
const transformFileWithBabel = (file, options) => new Promise((resolve, reject) => {
 
    const settings = Object.assign({}, OPTION_DEFAULTS, options);
 
    let sourceMaps = true;
 
    if (settings.sourcemap && !settings.output) {
 
        sourceMaps = 'inline';
 
    }
 
    const presets = PRESET_DEFAULTS.slice();
 
    if (settings.minify) {
 
        presets.push(babili);
 
    }
 
    babel.transformFile(file, {
        'plugins': [flowSyntax, flowStripTypes],
        presets,
        sourceMaps
    }, (err, result) => {
 
        if (err) {
 
            return reject(new Error(err));
 
        }
 
        let code = `${result.code.trim()}\n`;
        let map = null;
 
        if (settings.sourcemap) {
 
            map = `${JSON.stringify(result.map)}\n`;
 
            if (settings.output) {
 
                code = `${code}//# sourceMappingURL=${settings.output}.map\n`;
 
            }
 
        }
 
        return resolve({
            code,
            map
        });
 
    });
 
});
 
/**
 * Transforms a file with browserify.
 *
 * @example spire.transformFileWithBrowserify(file).then(function (result) { console.log(result); });
 * @param {String} file File path.
 * @param {Object} [options] Options object.
 * @param {Boolean} [options.sourcemap] Generate sourcemap.
 * @return {Object} Promise
 * @public
 */
 
const transformFileWithBrowserify = (file, options) => new Promise((resolve, reject) => {
 
    const settings = Object.assign({}, OPTION_DEFAULTS, options);
 
    const debug = settings.sourcemap;
 
    const presets = PRESET_DEFAULTS.slice();
 
    if (settings.minify) {
 
        presets.push(babili);
 
    }
 
    browserify(file, {debug})
        .transform(babelify, {
            'plugins': [flowSyntax, flowStripTypes],
            presets
        })
        .bundle((err, buffer) => {
 
            if (err) {
 
                return reject(new Error(err));
 
            }
 
            let code = `${buffer.toString().trim()}\n`;
            let map = null;
 
            if (settings.sourcemap) {
 
                map = atob(sourceMapPattern.exec(code)[sourceMapPatternMatchIndex]);
 
                if (settings.output) {
 
                    code = code.replace(
                        sourceMapPattern,
                        `//# sourceMappingURL=${settings.output}.map\n`
                    );
 
                }
 
            }
 
            return resolve({
                code,
                map
            });
 
        });
 
});
 
/**
 * Transforms a file.
 *
 * @example spire.transformFile(file, options).then(function (result) { console.log(result); });
 * @param {String} file File path.
 * @param {Object} [options] Options object.
 * @param {Boolean} [options.bundle] Use browserify bundler.
 * @param {Boolean} [options.sourcemap] Generate sourcemap.
 * @return {Object} Promise
 * @public
 */
 
const transformFile = (file, options) => {
 
    const settings = Object.assign({}, OPTION_DEFAULTS, options);
 
    if (settings.bundle) {
 
        return transformFileWithBrowserify(file, options);
 
    }
 
    return transformFileWithBabel(file, options);
 
};
 
/**
 * Lint a file.
 *
 * @example spire.lintFile(file, configFile).then(function (results) { console.log(results); });
 * @param {String} file File path.
 * @param {String} configFile Config file.
 * @return {Object} Promise
 * @public
 */
 
const lintFile = (file, configFile) => new Promise((resolve, reject) => {
 
    const cli = new CLIEngine({
        configFile
    });
 
    const report = cli.executeOnFiles([file]);
 
    const warningAndErrorCount = report.results.reduce((prev, curr) =>
        prev + curr.warningCount + curr.errorCount
    , 0);
 
    if (warningAndErrorCount) {
 
        const errorMessages = report.results.reduce((prev, curr) => {
 
            Eif (curr.messages.length) {
 
                prev.push(`\n${chalk.underline(curr.filePath)}\n${
                    curr.messages.map(message => {
 
                        const pos = `${message.line}:${message.column}`;
 
                        return `  ${chalk.grey(pos)}  ` +
                            `${ESLINT_SEVERITY[message.severity]}\t ` +
                            `${message.message}\t ${chalk.grey(message.ruleId)}`;
 
                    }).join('\n')}`);
 
            }
 
            return prev;
 
        }, []).join('\n');
 
        reject(errorMessages);
 
    } else {
 
        resolve();
 
    }
 
});
 
module.exports = {
    lintFile,
    transformFile,
    transformFileWithBabel,
    transformFileWithBrowserify
};