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This makes the `main` parameter optional and allows multiple entry points instead. `main` is still technically required by the schema, since it should almost always be set when invoked by a user. However, it now supports `null` as a value so it can be explicitly omitted. Longer term, we may choose to remove `main` and fold it into `entryPoints`, but for now we want to keep compatibility with the existing `browser` builder. Since `entryPoints` is an internal-only options (cannot be set in `angular.json` and isn't exposed in the schema), I made a new `buildEsbuildBrowserInternal()` function which adds the extra private option. This way direct invocations of the builder can provide this extra information without compromising the public API surface defined in the schema.