Method parsePatternWithDefault

src/parser.ts:2007–2021

(params, kind?: string)

    }

    parsePatternWithDefault(params, kind?: string): Node.AssignmentPattern | Node.BindingIdentifier | Node.BindingPattern {
        const startToken = this.lookahead;

        let pattern = this.parsePattern(params, kind);
        if (this.match('=')) {
            this.nextToken();
            const previousAllowYield = this.context.allowYield;
            this.context.allowYield = true;
            const right = this.isolateCoverGrammar(this.parseAssignmentExpression);
            this.context.allowYield = previousAllowYield;
            pattern = this.finalize(this.startNode(startToken), new Node.AssignmentPattern(pattern, right));
        }

        return pattern;
    }

    // https://tc39.github.io/ecma262/#sec-variable-statement