Method add

package/svelte/compiler.js:4872–4881

(value2)

      }
    }
    add(value2) {
      const normalized_value = value2.toLowerCase();
      if (normalized_value in this.exact_set) {
        return false;
      }
      let i = GRAM_SIZE_LOWER;
      for (i; i < GRAM_SIZE_UPPER + 1; ++i) {
        this._add(value2, i);
      }
    }
    _add(value2, gram_size) {
      const normalized_value = value2.toLowerCase();
      const items = this.items[gram_size] || [];