mirror of
https://github.com/systemjs/systemjs.git
synced 2026-01-25 14:57:38 +00:00
104 lines
3.0 KiB
JavaScript
104 lines
3.0 KiB
JavaScript
/*
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SystemJS Global Format
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Supports
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metadata.deps
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metadata.globals
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metadata.exports
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Without metadata.exports, detects writes to the global object.
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*/
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var __globalName = typeof self != 'undefined' ? 'self' : 'global';
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hook('reduceRegister_', function(reduceRegister) {
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return function(load, register) {
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if (register)
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return reduceRegister.call(this, load, register);
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load.metadata.format = 'global';
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var entry = load.metadata.entry = createEntry();
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var globalValue = readMemberExpression(load.metadata.exports, __global);
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entry.execute = function() {
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return globalValue;
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};
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};
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});
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hook('fetch', function(fetch) {
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return function(load) {
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if (load.metadata.exports)
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load.metadata.format = 'global';
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// A global with exports, no globals and no deps
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// can be loaded via a script tag
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if (load.metadata.format == 'global' && !load.metadata.authorization
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&& load.metadata.exports && !load.metadata.globals
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&& (!load.metadata.deps || load.metadata.deps.length == 0)
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&& load.metadata.scriptLoad !== false)
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load.metadata.scriptLoad = true;
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return fetch.call(this, load);
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};
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});
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// ideally we could support script loading for globals, but the issue with that is that
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// we can't do it with AMD support side-by-side since AMD support means defining the
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// global define, and global support means not definining it, yet we don't have any hook
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// into the "pre-execution" phase of a script tag being loaded to handle both cases
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hook('instantiate', function(instantiate) {
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return function(load) {
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var loader = this;
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if (!load.metadata.format)
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load.metadata.format = 'global';
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// globals shorthand support for:
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// globals = ['Buffer'] where we just require 'Buffer' in the current context
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if (load.metadata.globals) {
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if (load.metadata.globals instanceof Array) {
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var globals = {};
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for (var i = 0; i < load.metadata.globals.length; i++)
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globals[load.metadata.globals[i]] = load.metadata.globals[i];
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load.metadata.globals = globals;
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}
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}
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// global is a fallback module format
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if (load.metadata.format == 'global' && !load.metadata.registered) {
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var entry = createEntry();
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load.metadata.entry = entry;
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entry.deps = [];
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for (var g in load.metadata.globals)
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entry.deps.push(load.metadata.globals[g]);
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entry.execute = function(require, exports, module) {
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var globals;
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if (load.metadata.globals) {
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globals = {};
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for (var g in load.metadata.globals)
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globals[g] = require(load.metadata.globals[g]);
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}
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var exportName = load.metadata.exports;
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if (exportName)
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load.source += '\n' + __globalName + '["' + exportName + '"] = ' + exportName + ';';
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var retrieveGlobal = loader.get('@@global-helpers').prepareGlobal(module.id, exportName, globals);
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__exec.call(loader, load);
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return retrieveGlobal();
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}
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}
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return instantiate.call(this, load);
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};
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});
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