Method use

src/Instance.ts:76–260

(...args: MarkedExtension<ParserOutput, RendererOutput>[])

  }

  use(...args: MarkedExtension<ParserOutput, RendererOutput>[]) {
    const extensions: MarkedOptions<ParserOutput, RendererOutput>['extensions'] = this.defaults.extensions || { renderers: {}, childTokens: {} };

    args.forEach((pack) => {
      // copy options to new object
      const opts = { ...pack } as MarkedOptions<ParserOutput, RendererOutput>;

      // set async to true if it was set to true before
      opts.async = this.defaults.async || opts.async || false;

      // ==-- Parse "addon" extensions --== //
      if (pack.extensions) {
        pack.extensions.forEach((ext) => {
          if (!ext.name) {
            throw new Error('extension name required');
          }
          if ('renderer' in ext) { // Renderer extensions
            const prevRenderer = extensions.renderers[ext.name];
            if (prevRenderer) {
              // Replace extension with func to run new extension but fall back if false
              extensions.renderers[ext.name] = function(...args) {
                let ret = ext.renderer.apply(this, args);
                if (ret === false) {
                  ret = prevRenderer.apply(this, args);
                }
                return ret;
              };
            } else {
              extensions.renderers[ext.name] = ext.renderer;
            }
          }
          if ('tokenizer' in ext) { // Tokenizer Extensions
            if (!ext.level || (ext.level !== 'block' && ext.level !== 'inline')) {
              throw new Error("extension level must be 'block' or 'inline'");
            }
            const extLevel = extensions[ext.level];
            if (extLevel) {
              extLevel.unshift(ext.tokenizer);
            } else {
              extensions[ext.level] = [ext.tokenizer];
            }
            if (ext.start) { // Function to check for start of token
              if (ext.level === 'block') {
                if (extensions.startBlock) {
                  extensions.startBlock.push(ext.start);
                } else {
                  extensions.startBlock = [ext.start];
                }
              } else if (ext.level === 'inline') {
                if (extensions.startInline) {
                  extensions.startInline.push(ext.start);
                } else {
                  extensions.startInline = [ext.start];
                }
              }
            }
          }
          if ('childTokens' in ext && ext.childTokens) { // Child tokens to be visited by walkTokens