'let' instead of 'var' in ES5 bundles

[javiermarinros]

The Angular CLI generated ES5 bundles fails in old ES5 browsers because it's using let instead of var in source code areas related to localization and i18n using Angular + Angular CLI 9.1.7

Steps to reproduce:

ng new test
ng add @angular/localize
set "localize": true in angular.json
ng build
check generated vendor-es5.js file and look for the string let

[petebacondarwin]

This should have been fixed by #17625

[petebacondarwin]

But it only landed on master so will only take effect in v10.0.0...

[petebacondarwin]

Perhaps you could try updating CLI to v10.0.0-next.5?

[javiermarinros]

For now I'm manually replacing 'let' with 'var' before deploying to production and it works, I'll try CLI v10

[alan-agius4]

Closed via #17749

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