tasks: refactor listByTypePaged into list with options

this way we can list by prefix (coming commit)

src/tasks.js

@@ -6,7 +6,7 @@ exports = module.exports = {
     update,
     setCompleted,
     setCompletedByType,
-    listByTypePaged,
+    list,
 
     getLogs,
 
@@ -143,7 +143,7 @@ async function setCompletedByType(type, task) {
     assert.strictEqual(typeof type, 'string');
     assert.strictEqual(typeof task, 'object');
 
-    const results = await listByTypePaged(type, 1, 1);
+    const results = await list(1, 1, { type });
     if (results.length !== 1) throw new BoxError(BoxError.NOT_FOUND, 'No such task');
 
     await setCompleted(results[0].id, task);
@@ -232,17 +232,17 @@ async function stopAllTasks() {
     if (error) debug(`stopAllTasks: error stopping stasks: ${error.message}`);
 }
 
-async function listByTypePaged(type, page, perPage) {
-    assert(typeof type === 'string' || type === null);
+async function list(page, perPage, options) {
     assert.strictEqual(typeof page, 'number');
     assert.strictEqual(typeof perPage, 'number');
+    assert.strictEqual(typeof options, 'object');
 
     const data = [];
     let query = `SELECT ${TASKS_FIELDS} FROM tasks`;
 
-    if (type) {
+    if (options.type) {
         query += ' WHERE TYPE=?';
-        data.push(type);
+        data.push(options.type);
     }
 
     query += ' ORDER BY creationTime DESC, id DESC LIMIT ?,?'; // put latest task first