Improve use of Typescript (#474)

* Switch out needle with node-fetch

* Iterate

* Update asar package and switch to canonical name

* Use ts-node for scripts

* Iterate

* Update yarn.lock

* Use node:stream.promises

* Remove logfile

* Fix types

* Fix types

scripts/set-version.ts

@@ -0,0 +1,58 @@
+#!/usr/bin/env -S npx ts-node
+
+/*
+ * Checks for the presence of a webapp, inspects its version and sets the
+ * version metadata of the package to match.
+ */
+
+import { promises as fs } from "fs";
+import * as asar from "asar";
+import * as childProcess from "child_process";
+
+export async function versionFromAsar(): Promise<string> {
+    try {
+        await fs.stat('webapp.asar');
+    } catch (e) {
+        throw new Error("No 'webapp.asar' found. Run 'yarn run fetch'");
+    }
+
+    return asar.extractFile('webapp.asar', 'version').toString().trim();
+}
+
+export async function setPackageVersion(ver: string): Promise<void> {
+    // set version in package.json: electron-builder will use this to populate
+    // all the various version fields
+    await new Promise<void>((resolve, reject) => {
+        childProcess.execFile(process.platform === 'win32' ? 'yarn.cmd' : 'yarn', [
+            'version',
+            '-s',
+            '--no-git-tag-version', // This also means "don't commit to git" as it turns out
+            '--new-version',
+            ver,
+        ], (err) => {
+            if (err) {
+                reject(err);
+            } else {
+                resolve();
+            }
+        });
+    });
+}
+
+async function main(args: string[]): Promise<number> {
+    let version = args[0];
+
+    if (version === undefined) version = await versionFromAsar();
+
+    await setPackageVersion(version);
+    return 0;
+}
+
+if (require.main === module) {
+    main(process.argv.slice(2)).then((ret) => {
+        process.exit(ret);
+    }).catch(e => {
+        console.error(e);
+        process.exit(1);
+    });
+}