async exportPlatform(platform, opts) {
    const dictionary = await this.getPlatformTokens(platform, opts);
    return dictionary.tokens;
  }
Public wrapper around _exportPlatform, returns only tokens object
Here for backwards compatibility.
@deprecated use getPlatformTokens instead

@param {string} platform
@param {{ cache?: boolean }} [opts]
@returns {Promise<TransformedTokens>}