Spinner is flickering while spinning. In most cases (single line + all frames same width) it's enough to remove this.stream.clearLine(); here:
https://github.com/sindresorhus/ora/blob/master/index.js#L231

If frame renders this: fullPrefixText + frame + fullText. Both texts are static, so seems that clearLine is required for those specific cases, when frame width differs.

Suggestion: add an option, that disables this.stream.clearLine() call.