build(psm-tool): pasteImports reconstructs single-file script

 - ignore Google Apps Scripts config

packages/psm-tool/app/.npmignore

@@ -0,0 +1 @@
+.clasp.json

packages/psm-tool/package.json

@@ -27,7 +27,9 @@
     "./package.json": "./package.json"
   },
   "scripts": {
-    "build": "mkdir -p app/build; sed 's/^export .*//' src/psm-lib.js >app/build/psm-lib.js",
+    "build": "yarn build:script && yarn build:app",
+    "build:script": "mkdir -p dist; node scripts/pasteImports.js dist/psm-tool src/psm-lib.js scripts/psm-tool.js",
+    "build:app": "mkdir -p app/build; sed 's/^export .*//' src/psm-lib.js >app/build/psm-lib.js",
     "clasp:push": "yarn build && cd app; clasp push",
     "test": "ava",
     "lint-fix": "yarn lint:eslint --fix",
@@ -45,13 +47,17 @@
     "*.ts",
     "LICENSE*",
     "app",
+    "dist",
     "src"
   ],
   "publishConfig": {
     "access": "public"
   },
   "eslintConfig": {
-    "ignorePatterns": "build/*"
+    "ignorePatterns": [
+      "dist/*",
+      "build/*"
+    ]
   },
   "ava": {
     "files": [

packages/psm-tool/scripts/pasteImports.js

@@ -0,0 +1,33 @@
+// @ts-check
+
+const dieTrying = () => {
+  throw Error();
+};
+
+/**
+ *
+ * @param {string[]} argv
+ * @param {object} io
+ * @param {typeof import('fs').promises.readFile} io.readFile
+ * @param {typeof import('fs').promises.writeFile} io.writeFile
+ */
+const main = async (argv, { readFile, writeFile }) => {
+  const dest = argv.shift() || dieTrying();
+  const mainFn = argv.pop() || dieTrying();
+  const parts = [];
+  for await (const fn of argv) {
+    const txt = await readFile(fn, 'utf-8');
+    parts.push(txt.replace(/^export /gm, ''));
+  }
+  const txt = await readFile(mainFn, 'utf-8');
+  const script = txt.replace(/import {[^}]*} from [^;]+;/m, parts.join('\n'));
+
+  await writeFile(dest, script);
+  console.info('built', dest, 'from', mainFn, 'with', argv);
+};
+
+(async () => {
+  // eslint-disable-next-line no-undef
+  const { argv } = process;
+  import('fs').then(fs => main(argv.slice(2), fs.promises));
+})().catch(err => console.error(err));