code: function dedupeDefaultVert() {
      const defaultVert = path.join(__dirname, 'tools/fragments/default.vert');
      const fragment = fs.readFileSync(defaultVert, 'utf8')
          .replace(/\n/g, '\\\\n')
          .replace(/([()*=.])/g, '\\$1');
  
      const pattern = new RegExp(`(var ([^=\\s]+)\\s?=\\s?)"${fragment}"`, 'g');
  
      return {
          name: 'dedupeDefaultVert',
          renderChunk(code) {
              const matches = [];
              let match;
  
              while ((match = pattern.exec(code)) !== null) {
                  matches.push(match);
              }
  
              if (matches.length <= 1) {
                  return null;
              }
  
              const str = new MagicString(code);
              const key = matches[0][2];
  
              for (let i = 1; i < matches.length; i++) {
                  const match = matches[i];
                  const start = code.indexOf(match[0]);
  
                  str.overwrite(
                      start,
                      start + match[0].length,
                      match[1] + key
                  );
              }
  
              return {
                  code: str.toString(),
                  map: str.generateMap({ hires: true }),
              };
          },
      };
  }
docs: This plugin is a filesize optimization for the pixi-filters bundle
  it removes all the successive occurances of the default vertex fragment
  and reassigns the name of the vertex variable
  @function dedupeDefaultVert
  @private