Initial commit

.gitignore

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+/@types/
+/lib/
+/node_modules/

package-lock.json

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+{
+  "name": "simple-spawn",
+  "version": "0.1.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@types/node": {
+      "version": "14.14.19",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.19.tgz",
+      "integrity": "sha512-4nhBPStMK04rruRVtVc6cDqhu7S9GZai0fpXgPXrFpcPX6Xul8xnrjSdGB4KPBVYG/R5+fXWdCM8qBoiULWGPQ=="
+    },
+    "emittery": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/emittery/-/emittery-0.8.0.tgz",
+      "integrity": "sha512-XMGToId3CejfmZg/0qOzdTT3WFuAN8fQYtcKXccabRfCzGiWMSTydMshHGLyx9C/ejMl4nw9tvqrn12QVFPIUg=="
+    },
+    "typescript": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.1.3.tgz",
+      "integrity": "sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==",
+      "dev": true
+    }
+  }
+}

package.json

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+{
+  "name": "simple-spawn",
+  "version": "0.1.0",
+  "description": "Simple process spawning utility for node.js",
+  "main": "dist/index.js",
+  "types": "./@types/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "watch": "npm run build -- --watch"
+  },
+  "repository": "https://git.kuba-orlik.name/kuba/node-simple-spawn",
+  "author": "Kuba Orlik",
+  "license": "ISC",
+  "dependencies": {
+    "@types/node": "^14.14.19",
+    "emittery": "^0.8.0"
+  },
+  "devDependencies": {
+    "typescript": "^4.1.3"
+  }
+}

src/index.ts

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+import { ChildProcessWithoutNullStreams, spawn } from "child_process";
+import Emittery from "emittery";
+
+export default function simpleSpawn(
+  cmd: string,
+  arg: string[]
+): Promise<string> {
+  const process = spawn(cmd, arg);
+  let output = "";
+  let err = "";
+  return new Promise((resolve, reject) => {
+    process.on("close", (code) => {
+      code === 0 ? resolve(output) : reject(err);
+    });
+    process.stdout.on("data", (data) => (output += data.toString("utf-8")));
+    process.stderr.on("data", (data) => (err += data.toString("utf-8")));
+  });
+}
+
+class DeferedSpawn extends Emittery {
+  constructor(private process: ChildProcessWithoutNullStreams) {
+    super();
+  }
+
+  async waitForAnswer() {
+    return new Promise((resolve, reject) => {
+      this.on("success", resolve);
+      this.on("error", reject);
+    });
+  }
+
+  async waitForNextData(): Promise<string | null> {
+    return new Promise((resolve, reject) => {
+      this.on("data", (data) => resolve(data.toString("utf-8")));
+      this.on("error", reject);
+      this.on("end", () => resolve(null));
+    });
+  }
+
+  kill() {
+    process.kill(-this.process.pid); // https://stackoverflow.com/a/49842576
+    debugger;
+    console.log("killed map!");
+  }
+}
+
+export function deferedSpawn(
+  cmd: string,
+  arg: string[]
+): Promise<DeferedSpawn> {
+  const process = spawn(cmd, arg, { detached: true });
+  let spawned = false;
+  let output = "";
+  let err = "";
+  const emitter = new DeferedSpawn(process);
+  return new Promise((resolve, reject) => {
+    process.stdout.on("data", (data) => {
+      output += data.toString("utf-8");
+      emitter.emit("data", data);
+    });
+    process.stderr.on("data", (data) => {
+      err += data.toString("utf-8");
+    });
+    process.on("spawn", () => {
+      resolve(emitter);
+    });
+    process.on("close", (code) => {
+      if (!spawned) {
+        reject(err);
+      } else {
+        if (code === 0) {
+          emitter.emit("success", output);
+        } else {
+          emitter.emit("error", err);
+        }
+        emitter.emit("end", { err, output });
+      }
+    });
+  });
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "esnext",
+    "moduleResolution": "node",
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictNullChecks": true,
+    "target": "ES2020",
+    "declaration": true,
+    "esModuleInterop": true,
+    "lib": ["es6", "esnext"],
+    "outDir": "lib",
+    "checkJs": true,
+    "allowJs": true,
+    "declarationDir": "@types",
+    "sourceMap": true
+  },
+  "include": ["src/**/*"]
+}