Merge pull request #20 from electron/refactor/add-ElectronVersions.fetch()

feat: add ElectronVersions.fetch()

Author: ckerr

src/versions.ts

@@ -240,18 +240,12 @@ export class ElectronVersions extends BaseVersions {
     return new ElectronVersions(versionsCache, now, versions);
   }
 
-  // upate the cache if it's too old
-  private async keepFresh(): Promise<void> {
-    const d = debug('fiddle-core:ElectronVersions:keepFresh');
-
-    // if it's still fresh, do nothing
+  // update the cache
+  public async fetch(): Promise<void> {
+    const d = debug('fiddle-core:ElectronVersions:fetch');
     const { mtimeMs, versionsCache } = this;
-    const now = Date.now();
-    if (ElectronVersions.isCacheFresh(mtimeMs, now)) return;
-
-    // update the cache
     try {
-      this.mtimeMs = now;
+      this.mtimeMs = Date.now();
       const versions = await ElectronVersions.fetchVersions(versionsCache);
       this.setVersions(versions);
       d(`saved "${versionsCache}"`);
@@ -261,6 +255,13 @@ export class ElectronVersions extends BaseVersions {
     }
   }
 
+  // upate the cache iff it's too old
+  private async keepFresh(): Promise<void> {
+    if (!ElectronVersions.isCacheFresh(this.mtimeMs, Date.now())) {
+      await this.fetch();
+    }
+  }
+
   public override get prereleaseMajors(): number[] {
     void this.keepFresh();
     return super.prereleaseMajors;