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'use strict';
module.exports = function applyPlugins(schema, plugins, options, cacheKey) {  if (schema[cacheKey]) {    return;  }  schema[cacheKey] = true;
  if (!options || !options.skipTopLevel) {    let pluginTags = null;    for (const plugin of plugins) {      const tags = plugin[1] == null ? null : plugin[1].tags;      if (!Array.isArray(tags)) {        schema.plugin(plugin[0], plugin[1]);        continue;      }
      pluginTags = pluginTags || new Set(schema.options.pluginTags || []);      if (!tags.find(tag => pluginTags.has(tag))) {        continue;      }      schema.plugin(plugin[0], plugin[1]);    }  }
  options = Object.assign({}, options);  delete options.skipTopLevel;
  if (options.applyPluginsToChildSchemas !== false) {    for (const path of Object.keys(schema.paths)) {      const type = schema.paths[path];      if (type.schema != null) {        applyPlugins(type.schema, plugins, options, cacheKey);
        // Recompile schema because plugins may have changed it, see gh-7572        type.caster.prototype.$__setSchema(type.schema);      }    }  }
  const discriminators = schema.discriminators;  if (discriminators == null) {    return;  }
  const applyPluginsToDiscriminators = options.applyPluginsToDiscriminators;
  const keys = Object.keys(discriminators);  for (const discriminatorKey of keys) {    const discriminatorSchema = discriminators[discriminatorKey];
    applyPlugins(discriminatorSchema, plugins,      { skipTopLevel: !applyPluginsToDiscriminators }, cacheKey);  }};