Method parseUnaryExpression

src/parser.ts:1399–1420

()

    }

    parseUnaryExpression(): Node.Expression {
        let expr;

        if (this.match('+') || this.match('-') || this.match('~') || this.match('!') ||
            this.matchKeyword('delete') || this.matchKeyword('void') || this.matchKeyword('typeof')) {
            const node = this.startNode(this.lookahead);
            const token = this.nextToken();
            expr = this.inheritCoverGrammar(this.parseUnaryExpression);
            expr = this.finalize(node, new Node.UnaryExpression(token.value, expr));
            if (this.context.strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) {
                this.tolerateError(Messages.StrictDelete);
            }
            this.context.isAssignmentTarget = false;
            this.context.isBindingElement = false;
        } else if (this.context.await && this.matchContextualKeyword('await')) {
            expr = this.parseAwaitExpression();
        } else {
            expr = this.parseUpdateExpression();
        }

        return expr;
    }

    parseExponentiationExpression(): Node.Expression {
        const startToken = this.lookahead;