Angular .gitignore template

dist is the production output and out-tsc is the intermediate directory the type checker writes into during a build. Keeping them separate is a detail of how the toolchain runs the compiler twice, once for type checking and once for bundling, and both directories are pure output.

.angular/cache is the local build cache. It stores compiled module output keyed to content hashes so a rebuild only redoes what changed. Like every build cache it is specific to the machine, the toolchain version and the dependency set, and a copy from someone else's machine is at best ignored and at worst a source of confusing stale output.

The e2e/*.js and e2e/*.map rules cover compiled end to end test files, which exist because those tests are written in TypeScript and compiled before running. testem.log, connect.lock and libpeerconnection.log come from the older browser test runner and the browser it launched, and they turn up in the project root during a test run.

bazel-out is the output directory for projects built with the alternative build system. .sass-cache is the compiled stylesheet cache from an older preprocessor setup, and typings is the pre modules directory for third party type declarations. Several of these are historical, kept because they cost nothing and an older repository may still produce them.

.env is included, which is a slightly unusual choice for a browser framework. Values that reach the browser bundle are readable by anyone who loads the page, so the rule is protecting a build time value or a local server configuration rather than anything that stays secret at runtime.