Initial implementation

.gitignore

@@ -59,3 +59,5 @@ typings/
 
 # next.js build output
 .next
+
+.DS_Store

README.md

@@ -1,2 +1,3 @@
 # narn
+
 Never have to switch between npm and yarn commands ever again

bin/narn.js

@@ -0,0 +1,20 @@
+#!/usr/bin/env node
+const { spawn } = require("child_process");
+const { detectYarn, getYarnArgs, getNpmArgs } = require("../lib/narn-lib.js");
+
+async function runPackageManager() {
+  const isYarn = await detectYarn();
+  const narnArgs = process.argv.slice(2);
+
+  const command = isYarn ? "yarn" : "npm";
+  const commandArgs = isYarn ? getYarnArgs(narnArgs) : getNpmArgs(narnArgs);
+
+  console.info(`${command} ${commandArgs.join(" ")}`);
+
+  spawn(command, commandArgs, { stdio: "inherit" });
+}
+
+runPackageManager().catch(err => {
+  console.error(err);
+  process.exit(1);
+});

lib/narn-lib.js

@@ -0,0 +1,52 @@
+const fs = require("fs");
+const path = require("path");
+const minimist = require("minimist");
+
+exports.detectYarn = function detectYarn() {
+  return new Promise((resolve, reject) => {
+    fs.access(
+      path.resolve(process.cwd(), "package-lock.json"),
+      fs.constants.F_OK,
+      noPackageLock => {
+        resolve(Boolean(noPackageLock));
+      }
+    );
+  });
+};
+
+exports.getYarnArgs = narnArgs => narnArgs;
+
+exports.getNpmArgs = narnArgs => {
+  const yarnArgs = minimist(narnArgs);
+  const yarnCommands = yarnArgs._;
+  const yarnTarget = yarnCommands.length > 0 ? yarnCommands[0] : "install";
+  const yarnSubCommands = yarnCommands.slice(1);
+  let npmTarget;
+  let npmArgs;
+
+  switch (yarnTarget) {
+    case "install":
+      npmTarget = "install";
+      npmArgs = [];
+      break;
+    case "add":
+      npmTarget = "install";
+      const packages = yarnSubCommands.map(packageToAdd =>
+        packageToAdd.lastIndexOf("@") > 0
+          ? packageToAdd
+          : `${packageToAdd}@latest`
+      );
+      npmArgs = ["--save", ...packages];
+      break;
+    case "remove":
+      npmTarget = "uninstall";
+      npmArgs = yarnSubCommands;
+      break;
+    default:
+      npmTarget = "run";
+      npmArgs = narnArgs;
+      break;
+  }
+
+  return [npmTarget, ...npmArgs];
+};

package.json

@@ -0,0 +1,31 @@
+{
+  "name": "narn",
+  "version": "1.0.0",
+  "main": "lib/narn-lib.js",
+  "bin": {
+    "narn": "bin/narn.js"
+  },
+  "repository": "[email protected]:joeldenning/narn.git",
+  "author": "Joel Denning <[email protected]>",
+  "homepage": "https://github.com/joeldenning/narn",
+  "license": "MIT",
+  "scripts": {
+    "test": "jest --env=node",
+    "prettier": "prettier 'bin/**/*' --write"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "pretty-quick --staged"
+    }
+  },
+  "devDependencies": {
+    "@types/jest": "^24.0.19",
+    "husky": "^3.0.9",
+    "jest": "^24.9.0",
+    "jest-cli": "^24.9.0",
+    "minimist": "^1.2.0",
+    "prettier": "^1.18.2",
+    "pretty-quick": "^2.0.0"
+  },
+  "dependencies": {}
+}

test/add.test.js

@@ -0,0 +1,40 @@
+const { getNpmArgs } = require("../lib/narn-lib");
+
+describe("narn add", () => {
+  it("forces packages to be saved", () => {
+    expect(getNpmArgs(["add", "lodash"]).slice(0, 2)).toEqual([
+      "install",
+      "--save"
+    ]);
+  });
+
+  it("can install multiple packages with their semantic version specified", () => {
+    expect(getNpmArgs(["add", "[email protected]", "react-dom@^16.10.0"])).toEqual([
+      "install",
+      "--save",
+      "[email protected]",
+      "react-dom@^16.10.0"
+    ]);
+  });
+
+  it("forces latest version of package when semantic version is omitted, same as yarn add", () => {
+    expect(getNpmArgs(["add", "lodash"])).toEqual([
+      "install",
+      "--save",
+      "lodash@latest"
+    ]);
+  });
+
+  it("works with scoped packages", () => {
+    expect(getNpmArgs(["add", "@openmrs/esm-api"])).toEqual([
+      "install",
+      "--save",
+      "@openmrs/esm-api@latest"
+    ]);
+    expect(getNpmArgs(["add", "@openmrs/esm-api@~1.0.0"])).toEqual([
+      "install",
+      "--save",
+      "@openmrs/esm-api@~1.0.0"
+    ]);
+  });
+});

test/install.test.js

@@ -0,0 +1,11 @@
+const { getNpmArgs } = require("../lib/narn-lib");
+
+describe("narn install", () => {
+  it("defaults to npm install if no args are provided", () => {
+    expect(getNpmArgs([])).toEqual(["install"]);
+  });
+
+  it("works when install is specified", () => {
+    expect(getNpmArgs(["install"])).toEqual(["install"]);
+  });
+});

test/remove.test.js

@@ -0,0 +1,11 @@
+const { getNpmArgs } = require("../lib/narn-lib");
+
+describe("narn remove", () => {
+  it("removes packages", () => {
+    expect(getNpmArgs(["remove", "@angular/cli", "@angular/core"])).toEqual([
+      "uninstall",
+      "@angular/cli",
+      "@angular/core"
+    ]);
+  });
+});