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ElmAsset.js
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ElmAsset.js
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const Asset = require('../Asset');
const commandExists = require('command-exists');
const localRequire = require('../utils/localRequire');
const {minify} = require('terser');
const path = require('path');
const spawn = require('cross-spawn');
class ElmAsset extends Asset {
constructor(name, options) {
super(name, options);
this.type = 'js';
}
async parse() {
let options = {
cwd: path.dirname(this.name)
};
// If elm is not installed globally, install it locally.
try {
await commandExists('elm');
} catch (err) {
await localRequire('elm', this.name);
options.pathToElm = path.join(
path.dirname(require.resolve('elm')),
'bin',
'elm'
);
}
this.elm = await localRequire('node-elm-compiler', this.name);
// Ensure that an elm.json file exists, and initialize one if not.
let elmConfig = await this.getConfig(['elm.json'], {load: false});
if (!elmConfig) {
await this.createElmConfig(options);
// Ensure we are watching elm.json for changes
await this.getConfig(['elm.json'], {load: false});
}
options.debug = !this.options.production;
if (this.options.minify) {
options.optimize = true;
}
this.elmOpts = options;
}
async collectDependencies() {
let dependencies = await this.elm.findAllDependencies(this.name);
for (let dependency of dependencies) {
this.addDependency(dependency, {includedInParent: true});
}
}
async createElmConfig(options) {
let cp = spawn(options.pathToElm || 'elm', ['init']);
cp.stdin.write('y\n');
return new Promise((resolve, reject) => {
cp.on('error', reject);
cp.on('close', function(code) {
if (code !== 0) {
return reject(new Error('elm init failed.'));
}
return resolve();
});
});
}
async generate() {
let compiled = await this.elm.compileToString(this.name, this.elmOpts);
this.contents = compiled.toString();
if (this.options.hmr) {
let {inject} = await localRequire('elm-hot', this.name);
this.contents = inject(this.contents);
}
let output = this.contents;
if (this.options.minify) {
output = pack(output);
}
return {
[this.type]: output
};
// Recommended minification
// Based on:
// - http://elm-lang.org/0.19.0/optimize
function pack(source) {
let options = {
compress: {
keep_fargs: false,
passes: 2,
pure_funcs: [
'F2',
'F3',
'F4',
'F5',
'F6',
'F7',
'F8',
'F9',
'A2',
'A3',
'A4',
'A5',
'A6',
'A7',
'A8',
'A9'
],
pure_getters: true,
unsafe: true,
unsafe_comps: true
},
mangle: true,
rename: false
};
let result = minify(source, options);
if (result.error) {
throw result.error;
}
return result.code;
}
}
generateErrorMessage(err) {
// The generated stack is not useful, but other code may
// expect it and try to print it, so make it an empty string.
err.stack = '';
return err;
}
}
module.exports = ElmAsset;