Migrate e2e tests to TypeScript

e2e/lib/clipboard.ts

@@ -0,0 +1,66 @@
+import { spawn } from 'child_process';
+
+const readLinux = (): Promise<string> => {
+  let stdout = '', stderr = '';
+  return new Promise((resolve) => {
+    let xsel = spawn('xsel', ['--clipboard', '--output']);
+    xsel.stdout.on('data', (data) => {
+      stdout += data;
+    });
+    xsel.stderr.on('data', (data) => {
+      stderr += data;
+    });
+    xsel.on('close', (code) => {
+      if (code !== 0) {
+        throw new Error(`xsel returns ${code}: ${stderr}`)
+      }
+      resolve(stdout);
+    });
+  });
+};
+
+const writeLinux = (data: string): Promise<string> => {
+  let stderr = '';
+  return new Promise((resolve) => {
+    let xsel = spawn('xsel', ['--clipboard', '--input']);
+    xsel.stderr.on('data', (data) => {
+      stderr += data;
+    });
+    xsel.on('close', (code) => {
+      if (code !== 0) {
+        throw new Error(`xsel returns ${code}: ${stderr}`)
+      }
+      resolve();
+    });
+    xsel.stdin.write(data);
+    xsel.stdin.end();
+  });
+};
+
+class UnsupportedError extends Error {
+  constructor(platform: string) {
+    super();
+    this.message = `Unsupported platform: ${platform}`;
+  }
+}
+
+const read = () => {
+  switch (process.platform) {
+  case 'linux':
+    return readLinux();
+  }
+  throw new UnsupportedError(process.platform);
+}
+
+const write = (data: string) => {
+  switch (process.platform) {
+  case 'linux':
+    return writeLinux(data);
+  }
+  throw new UnsupportedError(process.platform);
+}
+
+export {
+  read,
+  write,
+};