var>, <var>e</var>.<var class="field">[[Value]]</var>, <var>e</var>.<var class="field">[[Key]]</var>, <var>map</var>&nbsp;»)</li></ol></li><li>Set <var>first</var> to <emu-val>false</emu-val></li></ol></li></ol></li><li>If <var>first</var> is <emu-val>true</emu-val> and <var>initialValue</var> is not present, throw <emu-val>TypeError</emu-val> exception.</li><li>Return <var>accumulator</var>.</li></ol></emu-alg></emu-import>
        </emu-clause>

        <emu-clause id="Map.prototype.merge">
            <