toString() {
        // The order of the characters should be as specified here to ensure correctness:
        // https://learn.microsoft.com/en-us/rest/api/storageservices/constructing-an-account-sas
        // Use a string array instead of string concatenating += operator for performance
        const permissions = [];
        if (this.read) {
            permissions.push("r");
        }
        if (this.write) {
            permissions.push("w");
        }
        if (this.delete) {
            permissions.push("d");
        }
        if (this.deleteVersion) {
            permissions.push("x");
        }
        if (this.filter) {
            permissions.push("f");
        }
        if (this.tag) {
            permissions.push("t");
        }
        if (this.list) {
            permissions.push("l");
        }
        if (this.add) {
            permissions.push("a");
        }
        if (this.create) {
            permissions.push("c");
        }
        if (this.update) {
            permissions.push("u");
        }
        if (this.process) {
            permissions.push("p");
        }
        if (this.setImmutabilityPolicy) {
            permissions.push("i");
        }
        if (this.permanentDelete) {
            permissions.push("y");
        }
        return permissions.join("");
    }
Produces the SAS permissions string for an Azure Storage account.
Call this method to set AccountSASSignatureValues Permissions field.

Using this method will guarantee the resource types are in
an order accepted by the service.

@see https://learn.microsoft.com/en-us/rest/api/storageservices/constructing-an-account-sas