Make esm amd loader a singleton#502

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aomarks merged 9 commits intomasterfrom

Jun 11, 2018

Commits on Jun 3, 2018

Don't run loader if it was already loaded
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Update goldens
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Commits on Jun 8, 2018

Merge branch 'master' of https://github.com/Polymer/tools into feature/singleton-esm-amd-loader
Lars den Bakker
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Update goldens
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bootstrap
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