tsec is a TypeScript compiler wrapper for restricting use of security-sensitive DOM APIs, in particular those that could lead to XSS or Trusted Types violations. Add it as a linter to aio to prevent future Trusted Types regressions on angular.io. Also introduces security_exemptions.json, which lists the known, security-reviewed tsec security violations. New entries can only be added to this file after a security review, in particular making sure that the corresponding code does not cause XSS vulnerabilities or Trusted Types violations. PR Close #42800
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