added more specific types

lib/ical/component.js

@@ -8,6 +8,24 @@ import Timezone from "./timezone.js";
 import ICALParse from "./parse.js";
 import stringify from "./stringify.js";
 import design from "./design.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Duration from "./duration.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import UtcOffset from "./utc_offset.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Binary from "./binary.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Period from "./period.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Recur from "./recur.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Time from "./time.js";
 
 /**
  * This lets typescript resolve our custom types in the
@@ -277,8 +295,9 @@ class Component {
   /**
    * Returns first property's value, if available.
    *
-   * @param {String=} name    Lowercase property name
-   * @return {?Object}        The found property value.
+   * @param {String=} name                    Lowercase property name
+   * @return {Binary | Duration | Period |
+   * Recur | Time | UtcOffset | null}         The found property value.
    */
   getFirstPropertyValue(name) {
     let prop = this.getFirstProperty(name);

lib/ical/property.js

@@ -9,11 +9,30 @@ const TYPE_INDEX = 2;
 const VALUE_INDEX = 3;
 
 import design from "./design.js";
+import ICALStringify from "./stringify.js";
+import ICALParse from "./parse.js";
+
 // needed for typescript type resolution
 // eslint-disable-next-line no-unused-vars
 import Component from "./component.js";
-import ICALStringify from "./stringify.js";
-import ICALParse from "./parse.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Duration from "./duration.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import UtcOffset from "./utc_offset.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Binary from "./binary.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Period from "./period.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Recur from "./recur.js";
+// needed for typescript type resolution
+// eslint-disable-next-line no-unused-vars
+import Time from "./time.js";
 
 /**
  * This lets typescript resolve our custom types in the
@@ -300,7 +319,8 @@ class Property {
   /**
    * Finds the first property value.
    *
-   * @return {Object}         First property value
+   * @return {Binary | Duration | Period |
+   * Recur | Time | UtcOffset | null}         First property value
    */
   getFirstValue() {
     return this._hydrateValue(0);