Protoc does not export grpc-web files [MacOS]

Question

I have a simple proto file:

syntax = "proto3";

package SettingsSvc;

service Settings {
    rpc FetchSettings(SettingsRequest) returns (SettingsResponse) {}
}

message SettingsRequest {
    string language = 1;
}


message SettingsResponse {
    string cvTooltip = 1;
    string themeTooltip = 2;
    string githubLocation = 3;
    string gitlabLocation = 4;
    string linkedinLocation = 5;
    string name = 6;
    int32 year = 7;
}

And I am trying to generate the files for a react (TS template) web client. As suggested by the official grpc-web page I am running the protoc command as follows:

protoc -I=. settings.proto --js_out=import_style=commonjs,binary:. --grpc-web_out=import_style=typescript,mode=grpcweb:.

However, the only file I get is settings_pb.js, which is the one generated by the --js_out instruction. The file that should be generated by the --grpc-web_out instruction (SettingsClientPb.ts) is missing.

I tried using import_style=commonjs and import_style=commonjs+dts as well, but no luck. The command returns no errors but it does not produce the expected output files.

I installed protoc with brew and I am using version 1.3.1 of the grpc-web code generator plugin.

I couldn't find any mention of bugs and my command line instruction seems right to me.