.flat() is not a function code example

Example 1: fields.flat is not a function

//node_modules/discord.js/src/structures/MessageEmbed.js
static normalizeFields(...fields) {
    return fields
      .reduce((acc, val) => acc.concat(val), [])
      .map(field =>
        this.normalizeField(
          field && field.name,
          field && field.value,
          field && typeof field.inline === 'boolean' ? field.inline : false,
        ),
      );
  }

Example 2: fields.flat is not a function

update node.js