Function parseParam

lib/assets/javascripts/JSXTransformer.js:8087–8150

(options)

    }

    function parseParam(options) {
        var marker, token, rest, param, def;

        token = lookahead;
        if (token.value === '...') {
            token = lex();
            rest = true;
        }

        if (match('[')) {
            marker = markerCreate();
            param = parseArrayInitialiser();
            reinterpretAsDestructuredParameter(options, param);
            if (match(':')) {
                param.typeAnnotation = parseTypeAnnotation();
                markerApply(marker, param);
            }
        } else if (match('{')) {
            marker = markerCreate();
            if (rest) {
                throwError({}, Messages.ObjectPatternAsRestParameter);
            }
            param = parseObjectInitialiser();
            reinterpretAsDestructuredParameter(options, param);
            if (match(':')) {
                param.typeAnnotation = parseTypeAnnotation();
                markerApply(marker, param);
            }
        } else {
            param =
                rest
                ? parseTypeAnnotatableIdentifier(
                    false, /* requireTypeAnnotation */
                    false /* canBeOptionalParam */
                )
                : parseTypeAnnotatableIdentifier(
                    false, /* requireTypeAnnotation */
                    true /* canBeOptionalParam */
                );

            validateParam(options, token, token.value);
        }

        if (match('=')) {
            if (rest) {
                throwErrorTolerant(lookahead, Messages.DefaultRestParameter);
            }
            lex();
            def = parseAssignmentExpression();
            ++options.defaultCount;
        }

        if (rest) {
            if (!match(')')) {
                throwError({}, Messages.ParameterAfterRestParameter);
            }
            options.rest = param;
            return false;