support for generating es6 imports and .d.ts files

.bazelversion

@@ -1 +1 @@
-7.2.1
+7.2.1

example/README.md

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+# Generation
+
+To build example output:
+
+```
+bazel build generator:protoc-gen-js
+protoc --plugin=protoc-gen-js=bazel-bin/generator/protoc-gen-js --proto_path=. --js_out=output_dir=example,library=test,import_style=es6,generate_dts,binary:. protos/test.proto
+protoc --plugin=protoc-gen-js=bazel-bin/generator/protoc-gen-js --proto_path=. --js_out=output_dir=example,library=test2,import_style=es6,generate_dts,binary:. protos/test2.proto
+```
+
+Generates all of:
+
+- `example/test.js`
+- `example/test2.js`
+- `example/test.d.ts`
+- `example/test2.d.ts`
+
+The `*.js` files are generated with ES6-style imports/exports. The `*.d.ts` files have TypeScript definitions for their respective `.js` files. The `test2.*` files demonstrate dependency between generated files.
+
+To regression test Closure output:
+
+```
+git checkout origin/main
+bazel build generator:protoc-gen-js
+protoc --plugin=protoc-gen-js=bazel-bin/generator/protoc-gen-js --proto_path=. --js_out=output_dir=example,library=test,import_style=closure,binary:. protos/test.proto
+mv example/test.js example-test.js
+protoc --plugin=protoc-gen-js=bazel-bin/generator/protoc-gen-js --proto_path=. --js_out=output_dir=example,library=test2,import_style=closure,binary:. protos/test2.proto
+mv example/test2.js example-test2.js
+rmdir example
+
+git checkout lukfugl/es6
+bazel build generator:protoc-gen-js
+mv example-test.js example/test.closure-old.js
+mv example-test2.js example/test2.closure-old.js
+protoc --plugin=protoc-gen-js=bazel-bin/generator/protoc-gen-js --proto_path=. --js_out=output_dir=example,library=test,import_style=closure,binary:. protos/test.proto
+mv example/test.js example/test.closure-new.js
+protoc --plugin=protoc-gen-js=bazel-bin/generator/protoc-gen-js --proto_path=. --js_out=output_dir=example,library=test2,import_style=closure,binary:. protos/test2.proto
+mv example/test2.js example/test2.closure-new.js
+
+diff example/test.closure-* > example/test.closure.diff # typo fix only
+diff example/test2.closure-* > example/test2.closure.diff # empty
+```