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feat: add dynamic import meta placeholder (#2431)

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陈杨文 2022-10-04 22:00:35 +08:00 committed by GitHub
parent 9fd1675eb8
commit dd3243dfc9
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1 changed files with 15 additions and 11 deletions
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26
src/system-core.js
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@ -1,6 +1,6 @@
/*
* SystemJS Core
*
*
* Provides
* - System.import
* - System.register support for
@ -10,7 +10,7 @@
* - Symbol.toStringTag support in Module objects
* - Hookable System.createContext to customize import.meta
* - System.onload(err, id, deps) handler for tracing / hot-reloading
*
*
* Core comes with no System.prototype.resolve or
* System.prototype.instantiate implementations
*/
@ -27,14 +27,15 @@ function SystemJS () {
var systemJSPrototype = SystemJS.prototype;
systemJSPrototype.import = function (id, parentUrl) {
systemJSPrototype.import = function (id, parentUrl, meta) {
var loader = this;
(parentUrl && typeof parentUrl === 'object') && (meta = parentUrl, parentUrl = undefined);
return Promise.resolve(loader.prepareImport())
.then(function() {
return loader.resolve(id, parentUrl);
return loader.resolve(id, parentUrl, meta);
})
.then(function (id) {
var load = getOrCreateLoad(loader, id);
var load = getOrCreateLoad(loader, id, undefined, meta);
return load.C || topLevelLoad(loader, load);
});
};
@ -76,7 +77,7 @@ systemJSPrototype.getRegister = function () {
return _lastRegister;
};
export function getOrCreateLoad (loader, id, firstParentUrl) {
export function getOrCreateLoad (loader, id, firstParentUrl, meta) {
var load = loader[REGISTRY][id];
if (load)
return load;
@ -85,10 +86,10 @@ export function getOrCreateLoad (loader, id, firstParentUrl) {
var ns = Object.create(null);
if (toStringTag)
Object.defineProperty(ns, toStringTag, { value: 'Module' });
var instantiatePromise = Promise.resolve()
.then(function () {
return loader.instantiate(id, firstParentUrl);
return loader.instantiate(id, firstParentUrl, meta);
})
.then(function (registration) {
if (!registration)
@ -124,8 +125,8 @@ export function getOrCreateLoad (loader, id, firstParentUrl) {
return value;
}
var declared = registration[1](_export, registration[1].length === 2 ? {
import: function (importId) {
return loader.import(importId, id);
import: function (importId, meta) {
return loader.import(importId, id, meta);
},
meta: loader.createContext(id)
} : undefined);
@ -174,6 +175,9 @@ export function getOrCreateLoad (loader, id, firstParentUrl) {
i: importerSetters,
// module namespace object
n: ns,
// extra module information for import assertion
// shape like: { assert: { type: 'xyz' } }
m: meta,
// instantiate
I: instantiatePromise,
@ -269,7 +273,7 @@ function postOrderExec (loader, load, seen) {
load.d.forEach(function (depLoad) {
try {
var depLoadPromise = postOrderExec(loader, depLoad, seen);
if (depLoadPromise)
if (depLoadPromise)
(depLoadPromises = depLoadPromises || []).push(depLoadPromise);
}
catch (err) {