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Only overwrite content when resolving import.meta properties #2986

merged 1 commit into from Jul 9, 2019


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@lukastaegert lukastaegert commented Jul 8, 2019

This PR contains:

  • bugfix
  • feature
  • refactor
  • documentation
  • other

Are tests included?

  • yes (bugfixes and features will not be merged without tests)
  • no

Breaking Changes?

  • yes (breaking changes will not be merged unless absolutely necessary)
  • no

List any relevant issue numbers:


A small issue I stumbled across when working on #2938. As import meta properties are resolved AFTER everything else is rendered it is possible due to some quirks of magic-string that content is removed that should not be removed. For instance this code:

export const url = import.meta.url;

would become in SystemJS

System.register('bundle', [], function (exports, module) {
	'use strict';
	return {
		execute: function () {

			const url = exports('url', 'url'


Notice the missing closing bracket. This issue fixes this by making import.meta properties a "contentOnly" update, which should prevent other issues as well.

@lukastaegert lukastaegert force-pushed the fix-import-meta-resolution branch from a52c2df to c92cdcd Compare Jul 8, 2019
@lukastaegert lukastaegert merged commit 893c725 into master Jul 9, 2019
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@lukastaegert lukastaegert deleted the fix-import-meta-resolution branch Jul 9, 2019
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