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[react-packager] Move async dependencies to `System.import` 

Summary:
We've decided to move the syntax for asynchronously requiring async dependencies. The new syntax works better with promises and therefore withe async/await as well. The new syntax looks like this: `System.import('moduleA').then(moduleA => {...});` or if you're using async/await you could simply do:
  let moduleA = await System.import('moduleA');
  new moduleA().someFunction();

If you need to require multiple dependencies just do:
  Promise
    .all([System.import('moduleA'), System.import('moduleB')])
    .then((moduleA, moduleB) => {...})

or the equivalent using async/await
This commit is contained in:
Martín Bigio 2015-08-21 06:51:18 -07:00
parent f128269da7
commit d2f82b1dfd
4 changed files with 32 additions and 167 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

106
packager/react-packager/src/BundlesLayout/__tests__/BundlesLayoutIntegration-test.js vendored
View File

@ -169,7 +169,7 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);`,
System.import("a");`,
'a.js': `
/**,
* @providesModule a
@ -199,8 +199,8 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);
require.ensure(["b"]);`,
System.import("a");
System.import("b");`,
'a.js': `
/**,
* @providesModule a
@ -233,40 +233,6 @@ describe('BundlesLayout', () => {
);
});
pit('should put related async dependencies into the same bundle', () => {
setMockFilesystem({
'root': {
'index.js': `
/**
* @providesModule index
*/
require.ensure(["a", "b"]);`,
'a.js': `
/**,
* @providesModule a
*/`,
'b.js': `
/**
* @providesModule b
*/`,
}
});
return newBundlesLayout().generateLayout(['/root/index.js']).then(bundles =>
stripPolyfills(bundles).then(resolvedBundles =>
expect(resolvedBundles).toEqual({
id: 'bundle.0',
modules: ['/root/index.js'],
children: [{
id: 'bundle.0.1',
modules: ['/root/a.js', '/root/b.js'],
children: [],
}],
})
)
);
});
pit('should fully traverse sync dependencies', () => {
setMockFilesystem({
'root': {
@ -275,7 +241,7 @@ describe('BundlesLayout', () => {
* @providesModule index
*/
require("a");
require.ensure(["b"]);`,
System.import("b");`,
'a.js': `
/**,
* @providesModule a
@ -309,7 +275,7 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);`,
System.import("a");`,
'a.js': `
/**,
* @providesModule a
@ -349,8 +315,8 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);
require.ensure(["b"]);`,
System.import("a");
System.import("b");`,
'a.js': `
/**,
* @providesModule a
@ -397,12 +363,12 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);`,
System.import("a");`,
'a.js': `
/**,
* @providesModule a
*/,
require.ensure(["b"]);`,
System.import("b");`,
'b.js': `
/**
* @providesModule b
@ -436,46 +402,6 @@ describe('BundlesLayout', () => {
);
});
pit('should dedup same async bundle duplicated dependencies', () => {
setMockFilesystem({
'root': {
'index.js': `
/**
* @providesModule index
*/
require.ensure(["a", "b"]);`,
'a.js': `
/**,
* @providesModule a
*/,
require("c");`,
'b.js': `
/**
* @providesModule b
*/
require("c");`,
'c.js': `
/**
* @providesModule c
*/`,
}
});
return newBundlesLayout().generateLayout(['/root/index.js']).then(bundles =>
stripPolyfills(bundles).then(resolvedBundles =>
expect(resolvedBundles).toEqual({
id: 'bundle.0',
modules: ['/root/index.js'],
children: [{
id: 'bundle.0.1',
modules: ['/root/a.js', '/root/c.js', '/root/b.js'],
children: [],
}],
})
)
);
});
pit('should put image dependencies into separate bundles', () => {
setMockFilesystem({
'root': {
@ -483,7 +409,7 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);`,
System.import("a");`,
'a.js':`
/**,
* @providesModule a
@ -515,8 +441,8 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);
require.ensure(["b"]);`,
System.import("a");
System.import("b");`,
'a.js':`
/**,
* @providesModule a
@ -560,7 +486,7 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["./img.png"]);`,
System.import("./img.png");`,
'img.png': '',
}
});
@ -587,7 +513,7 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["a"]);`,
System.import("a");`,
'a.js':`
/**,
* @providesModule a
@ -619,7 +545,7 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["image!img"]);`,
System.import("image!img");`,
'img.png': '',
}
});
@ -646,7 +572,7 @@ describe('BundlesLayout', () => {
/**
* @providesModule index
*/
require.ensure(["aPackage"]);`,
System.import("aPackage");`,
'aPackage': {
'package.json': JSON.stringify({
name: 'aPackage',

42
packager/react-packager/src/DependencyResolver/Module.js vendored
View File

@ -135,9 +135,6 @@ class Module {
*/
const blockCommentRe = /\/\*(.|\n)*?\*\//g;
const lineCommentRe = /\/\/.+(\n|$)/g;
const trailingCommaRe = /,\s*$/g;
const removeSpacesRe = /\s/g;
const quotesRe = /'/g;
function extractRequires(code /*: string*/) /*: Array<string>*/ {
var deps = {
sync: [],
@ -163,40 +160,11 @@ function extractRequires(code /*: string*/) /*: Array<string>*/ {
// Parse async dependencies this module has. As opposed to what happens
// with sync dependencies, when the module is required, it's async
// dependencies won't be loaded into memory. This is deferred till the
// code path gets to a `require.ensure` statement. The syntax is similar
// to webpack's one:
// require.ensure(['dep1', 'dep2'], () => {
// var dep1 = require('dep1');
// var dep2 = require('dep2');
// // do something with dep1 and dep2
// });
.replace(replacePatterns.REQUIRE_ENSURE_RE, (match, dep, post) => {
dep = dep
.replace(blockCommentRe, '')
.replace(lineCommentRe, '')
.replace(trailingCommaRe, '')
.replace(removeSpacesRe, '')
.replace(quotesRe, '"');
if (dep) {
try {
dep = JSON.parse('[' + dep + ']');
} catch(e) {
throw 'Error processing `require.ensure` while attemping to parse ' +
'dependencies `[' + dep + ']`: ' + e;
}
dep.forEach(d => {
if (typeof d !== 'string') {
throw 'Error processing `require.ensure`: dependencies `[' +
d + ']` must be string literals';
}
});
// TODO: throw error if there are duplicate dependencies
deps.async.push(dep);
}
// code path gets to the import statement:
// System.import('dep1')
.replace(replacePatterns.SYSTEM_IMPORT_RE, (match, pre, quot, dep, post) => {
deps.async.push([dep]);
return match;
});
return deps;

48
packager/react-packager/src/DependencyResolver/__tests__/Module-test.js vendored
View File

@ -57,7 +57,7 @@ describe('Module', () => {
pit('should recognize single dependency', () => {
fs.__setMockFilesystem({
'root': {
'index.js': 'require.ensure(["dep1"], function() {});',
'index.js': 'System.import("dep1")',
}
});
@ -67,67 +67,37 @@ describe('Module', () => {
pit('should parse single quoted dependencies', () => {
fs.__setMockFilesystem({
'root': {
'index.js': 'require.ensure([\'dep1\'], function() {});',
'index.js': 'System.import(\'dep1\')',
}
});
return expectAsyncDependenciesToEqual([['dep1']]);
});
pit('should recognize multiple dependencies on the same statement', () => {
fs.__setMockFilesystem({
'root': {
'index.js': 'require.ensure(["dep1", "dep2"], function() {});',
}
});
return expectAsyncDependenciesToEqual([['dep1', 'dep2']]);
});
pit('should group async dependencies', () => {
pit('should parse multiple async dependencies on the same module', () => {
fs.__setMockFilesystem({
'root': {
'index.js': [
'require.ensure(["dep1", "dep2"], function() {});',
'require.ensure(["dep3", "dep4"], function() {});',
'System.import("dep1")',
'System.import("dep2")',
].join('\n'),
}
});
return expectAsyncDependenciesToEqual([
['dep1', 'dep2'],
['dep3', 'dep4']
['dep1'],
['dep2'],
]);
});
pit('shouldn\'t throw with ES6 arrow functions', () => {
fs.__setMockFilesystem({
'root': {
'index.js': 'require.ensure(["dep1", "dep2"], () => {});',
}
});
return expectAsyncDependenciesToEqual([['dep1', 'dep2']]);
});
pit('parse fine new lines', () => {
fs.__setMockFilesystem({
'root': {
'index.js': 'require.ensure(["dep1", \n"dep2"], () => {});',
'index.js': 'System.import(\n"dep1"\n)',
}
});
return expectAsyncDependenciesToEqual([['dep1', 'dep2']]);
});
pit('ignore comments', () => {
fs.__setMockFilesystem({
'root': {
'index.js': 'require.ensure(["dep1", /*comment*/"dep2"], () => {});',
}
});
return expectAsyncDependenciesToEqual([['dep1', 'dep2']]);
return expectAsyncDependenciesToEqual([['dep1']]);
});
});
});

3
packager/react-packager/src/DependencyResolver/replacePatterns.js vendored
View File

@ -11,4 +11,5 @@
exports.IMPORT_RE = /(\bimport\s+?(?:.+\s+?from\s+?)?)(['"])([^'"]+)(\2)/g;
exports.REQUIRE_RE = /(\brequire\s*?\(\s*?)(['"])([^'"]+)(\2\s*?\))/g;
exports.REQUIRE_ENSURE_RE = /\brequire\.ensure\s*\(\s*(?:\[([^\]]+)\])?/g;
exports.SYSTEM_IMPORT_RE = /(\bSystem\.import\s*?\(\s*?)(['"])([^'"]+)(\2\s*?\))/g;