Pete Bacon Darwin ee70a18a75 fix(ngcc): don't crash on cyclic source-map references (#36452)
The source-map flattening was throwing an error when there
is a cyclic dependency between source files and source-maps.
The error was either a custom one describing the cycle, or a
"Maximum call stack size exceeded" one.

Now this is handled more leniently, resulting in a partially loaded
source file (or source-map) and a warning logged.

Fixes #35727
Fixes #35757
Fixes https://github.com/angular/angular-cli/issues/17106
Fixes https://github.com/angular/angular-cli/issues/17115

PR Close #36452
2020-04-06 13:19:53 -07:00
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