add getGhostSpan()

lib/index.js

@@ -76,6 +76,7 @@ function initRecord(peer, config) {
   assertDBPlugin(peer)
 
   const ghostSpan = config.record?.ghostSpan ?? 32
+  if (ghostSpan < 1) throw new Error('config.record.ghostSpan must be >= 0')
 
   //#region state
   let accountID = /** @type {string | null} */ (null)
@@ -475,6 +476,13 @@ function initRecord(peer, config) {
     return false
   }
 
+  /**
+   * @returns {number}
+   */
+  function getGhostSpan() {
+    return ghostSpan
+  }
+
   /**
    * @public
    * @param {string} subdomain
@@ -532,6 +540,7 @@ function initRecord(peer, config) {
     read,
     getFeedID,
     isGhostable,
+    getGhostSpan,
     minGhostDepth,
     minRequiredDepth,
     squeeze,

test/index.test.js

@@ -29,6 +29,8 @@ test('setup', async (t) => {
     _nonce: 'alice',
   })
   await p(peer.record.load)(aliceID)
+
+  assert.equal(peer.record.getGhostSpan(), 4, 'getGhostSpan')
 })
 
 test('Record update() and get()', async (t) => {