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Add ESM support #214

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merged 1 commit into from
Jun 3, 2020
Merged

Add ESM support #214

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28 changes: 28 additions & 0 deletions lib/shared/require-or-import.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,28 @@
'use strict';

var pathToFileURL = require('url').pathToFileURL;

var importESM;
try {
importESM = new Function('id', 'return import(id);');
} catch (e) {
importESM = null;
}
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Node.js <10 errors out with a SyntaxError when loading a script that uses import(). So I dynamically create a function for that and catch the SyntaxError. That way we can keep supporting all Node.js versions all the way back to 0.10.


function requireOrImport(path, callback) {
var err = null;
var cjs;
try {
cjs = require(path);
} catch (e) {
if (pathToFileURL && importESM && e.code === 'ERR_REQUIRE_ESM') {
var url = pathToFileURL(path);
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@snoack snoack Jun 3, 2020 •
edited

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I just added this as I realized that import() fails if providing a Windows file path.

importESM(url).then(function(esm) { callback(null, esm); }, callback);
return;
}
err = e;
}
process.nextTick(function() { callback(err, cjs); });
}

module.exports = requireOrImport;
23 changes: 14 additions & 9 deletions lib/versioned/^3.7.0/index.js
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Expand Up @@ -11,9 +11,11 @@ var copyTree = require('../../shared/log/copy-tree');
var tildify = require('../../shared/tildify');
var logTasks = require('../../shared/log/tasks');
var ansi = require('../../shared/ansi');
var exit = require('../../shared/exit');
var logEvents = require('./log/events');
var logTasksSimple = require('./log/tasks-simple');
var registerExports = require('../../shared/register-exports');
var requireOrImport = require('../../shared/require-or-import');

function execute(opts, env, config) {
var tasks = opts._;
Expand All @@ -25,20 +27,23 @@ function execute(opts, env, config) {
}

// This is what actually loads up the gulpfile
var exported = require(env.configPath);
log.info('Using gulpfile', ansi.magenta(tildify(env.configPath)));
requireOrImport(env.configPath, function(err, exported) {
if (err) {
console.error(err);
exit(1);
}

var gulpInst = require(env.modulePath);
logEvents(gulpInst);
log.info('Using gulpfile', ansi.magenta(tildify(env.configPath)));

registerExports(gulpInst, exported);
var gulpInst = require(env.modulePath);
logEvents(gulpInst);

// Always unmute stdout after gulpfile is required
stdout.unmute();
registerExports(gulpInst, exported);

process.nextTick(function() {
var tree;
// Always unmute stdout after gulpfile is required
stdout.unmute();

var tree;
if (opts.tasksSimple) {
return logTasksSimple(env, gulpInst);
}
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15 changes: 9 additions & 6 deletions lib/versioned/^4.0.0-alpha.1/index.js
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Expand Up @@ -16,6 +16,7 @@ var logTasksSimple = require('../^4.0.0/log/tasks-simple');
var registerExports = require('../../shared/register-exports');

var copyTree = require('../../shared/log/copy-tree');
var requireOrImport = require('../../shared/require-or-import');

function execute(opts, env, config) {

Expand All @@ -32,16 +33,18 @@ function execute(opts, env, config) {
logSyncTask(gulpInst, opts);

// This is what actually loads up the gulpfile
var exported = require(env.configPath);
requireOrImport(env.configPath, function(err, exported) {
if (err) {
console.error(err);
exit(1);
}

registerExports(gulpInst, exported);
registerExports(gulpInst, exported);

// Always unmute stdout after gulpfile is required
stdout.unmute();
// Always unmute stdout after gulpfile is required
stdout.unmute();

process.nextTick(function() {
var tree;

if (opts.tasksSimple) {
return logTasksSimple(gulpInst.tree());
}
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15 changes: 9 additions & 6 deletions lib/versioned/^4.0.0-alpha.2/index.js
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Expand Up @@ -17,6 +17,7 @@ var registerExports = require('../../shared/register-exports');

var copyTree = require('../../shared/log/copy-tree');
var getTask = require('../^4.0.0/log/get-task');
var requireOrImport = require('../../shared/require-or-import');

function execute(opts, env, config) {

Expand All @@ -33,16 +34,18 @@ function execute(opts, env, config) {
logSyncTask(gulpInst, opts);

// This is what actually loads up the gulpfile
var exported = require(env.configPath);
requireOrImport(env.configPath, function(err, exported) {
if (err) {
console.error(err);
exit(1);
}

registerExports(gulpInst, exported);
registerExports(gulpInst, exported);

// Always unmute stdout after gulpfile is required
stdout.unmute();
// Always unmute stdout after gulpfile is required
stdout.unmute();

process.nextTick(function() {
var tree;

if (opts.tasksSimple) {
tree = gulpInst.tree();
return logTasksSimple(tree.nodes);
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15 changes: 9 additions & 6 deletions lib/versioned/^4.0.0/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ var registerExports = require('../../shared/register-exports');

var copyTree = require('../../shared/log/copy-tree');
var getTask = require('./log/get-task');
var requireOrImport = require('../../shared/require-or-import');

function execute(opts, env, config) {

Expand All @@ -33,16 +34,18 @@ function execute(opts, env, config) {
logSyncTask(gulpInst, opts);

// This is what actually loads up the gulpfile
var exported = require(env.configPath);
requireOrImport(env.configPath, function(err, exported) {
if (err) {
console.error(err);
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@snoack snoack May 27, 2020 •
edited

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Previously, if require() failed we got an unhandled exception on the module level. So I use console.error()+exit() here to mimick the old behavior as close as possible, or would you rather log this error differently? (I noticed that you generally seem to use gulplog).

Also I'm aware that I still have to do similar changes to the other lib/versioned/*/index.js scripts. But I'd first like to get your feedback on the general approach before moving forward. What do you think? Done.

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I think this works well! Good solution :)

exit(1);
}

registerExports(gulpInst, exported);
registerExports(gulpInst, exported);

// Always unmute stdout after gulpfile is required
stdout.unmute();
// Always unmute stdout after gulpfile is required
stdout.unmute();

process.nextTick(function() {
var tree;

if (opts.tasksSimple) {
tree = gulpInst.tree();
return logTasksSimple(tree.nodes);
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2 changes: 1 addition & 1 deletion package.json
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Expand Up @@ -47,7 +47,7 @@
"pretty-hrtime": "^1.0.0",
"replace-homedir": "^1.0.0",
"semver-greatest-satisfied-range": "^1.1.0",
"v8flags": "^3.0.1",
"v8flags": "^3.2.0",
"yargs": "^7.1.0"
},
"devDependencies": {
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41 changes: 41 additions & 0 deletions test/esm.js
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@@ -0,0 +1,41 @@
'use strict';

var expect = require('expect');
var fs = require('fs');
var path = require('path');
var semver = require('semver');
var skipLines = require('gulp-test-tools').skipLines;
var eraseTime = require('gulp-test-tools').eraseTime;
var runner = require('gulp-test-tools').gulpRunner;

var expectedDir = path.join(__dirname, 'expected');

if (semver.gte(process.version, '10.15.3')) {

describe('ESM', function() {

it('prints the task list', function(done) {
var options = '--tasks --sort-tasks ' +
'--gulpfile ./test/fixtures/gulpfiles/gulpfile.mjs';
var trailingLines = 1;
if (!semver.satisfies(process.version, '^12.17.0 || >=13.2.0')) {
options += ' --experimental-modules';
trailingLines += 2;
}

runner({ verbose: false }).gulp(options).run(cb);

function cb(err, stdout, stderr) {
expect(err).toEqual(null);
expect(stderr).toMatch(/^(.*ExperimentalWarning: The ESM module loader is experimental\.\n)?$/);
var filepath = path.join(expectedDir, 'esm.txt');
var expected = fs.readFileSync(filepath, 'utf-8');
stdout = eraseTime(skipLines(stdout, trailingLines));
expect(stdout).toEqual(expected);
done(err);
}
});

});

}
3 changes: 3 additions & 0 deletions test/expected/esm.txt
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@@ -0,0 +1,3 @@
gulp-cli/test/fixtures/gulpfiles
├── exported
└── registered
10 changes: 10 additions & 0 deletions test/fixtures/gulpfiles/gulpfile.mjs
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@@ -0,0 +1,10 @@
import gulp from 'gulp';

function noop(cb) {
cb();
}

gulp.task('registered', noop);

export function exported(){};
export const string = 'no function';