public BuildParameterBuilder sources(Collection<String> sources) {
        if (sources != null) {
            this.sources.addAll(sources);
        }

        return this;
    }
Adds a collection of "source" model files.

@param sources Sources to add.
@return Returns the builder.
smithy-cli/src/main/java/software/amazon/smithy/cli/BuildParameterBuilder.java