Convert hak to TypeScript (#289)

* Convert hak to TypeScript

* Fix linter & remove stray log line

* Fix more linting errors

In one case by switching to import() and hence esnext

* Return type for getNodeModuleBin

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

* More types

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

scripts/hak/link.ts

@@ -0,0 +1,70 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import path from 'path';
+import os from 'os';
+import fsProm from 'fs/promises';
+import childProcess from 'child_process';
+import HakEnv from './hakEnv';
+import { DependencyInfo } from './dep';
+
+export default async function link(hakEnv: HakEnv, moduleInfo: DependencyInfo): Promise<void> {
+    const yarnrc = path.join(hakEnv.projectRoot, '.yarnrc');
+    // this is fairly terrible but it's reasonably clunky to either parse a yarnrc
+    // properly or get yarn to do it, so this will probably suffice for now.
+    // We just check to see if there is a local .yarnrc at all, and assume that
+    // if you've put one there yourself, you probably know what you're doing and
+    // we won't meddle with it.
+    // Also we do this for each module which is unnecessary, but meh.
+    try {
+        await fsProm.stat(yarnrc);
+    } catch (e) {
+        await fsProm.writeFile(
+            yarnrc,
+            // XXX: 1. This must be absolute, as yarn will resolve link directories
+            // relative to the closest project root, which means when we run it
+            // in the dependency project, it will put the link directory in its
+            // own project folder rather than the main project.
+            // 2. The parser gets very confused by strings with colons in them
+            // (ie. Windows absolute paths) but strings in quotes get parsed as
+            // JSON so need to be valid JSON encoded strings (ie. have the
+            // backslashes escaped). JSON.stringify will add quotes and escape.
+            '--link-folder ' + JSON.stringify(path.join(hakEnv.dotHakDir, 'links')) + os.EOL,
+        );
+    }
+
+    const yarnCmd = 'yarn' + (hakEnv.isWin() ? '.cmd' : '');
+
+    await new Promise<void>((resolve, reject) => {
+        const proc = childProcess.spawn(yarnCmd, ['link'], {
+            cwd: moduleInfo.moduleOutDir,
+            stdio: 'inherit',
+        });
+        proc.on('exit', code => {
+            code ? reject(code) : resolve();
+        });
+    });
+
+    await new Promise<void>((resolve, reject) => {
+        const proc = childProcess.spawn(yarnCmd, ['link', moduleInfo.name], {
+            cwd: hakEnv.projectRoot,
+            stdio: 'inherit',
+        });
+        proc.on('exit', code => {
+            code ? reject(code) : resolve();
+        });
+    });
+}