Method assertWritableKey

src/bulk/bulkMetadataEditor.ts:279–283

* Throw if `key` is a reserved object-machinery name that cannot be written as * a frontmatter property (see `isReservedFrontmatterKey`). Centralizes the * refusal so the public `apply` boundary and the `applyToFile` write boundary * reject identically.

(key: string)

	 * reject identically.
	 */
	private assertWritableKey(key: string): void {
		if (isReservedFrontmatterKey(key)) {
			throw new Error(`"${key}" is a reserved property name and cannot be written to frontmatter.`);
		}
	}

	private wrapInArrayFor(key: string): boolean {
		const { mode, properties } = this.plugin.settings.EditMode;