This rule enforces that every proto file for a public API surface uses proto3, as mandated in AIP-191.
This rule looks at each proto file, and complains if the syntax is set to
proto2 (or missing, which means it defaults to
Incorrect code for this rule:
// Incorrect. syntax = "proto2"; // Should be proto3.
Correct code for this rule:
// Correct. syntax = "proto3";
If you need to violate this rule, use a comment at the top of the file. Remember to also include an aip.dev/not-precedent comment explaining why.
// (-- api-linter: core::0191::proto-version=disabled // aip.dev/not-precedent: We need to do this because reasons. --) syntax = "proto2";