No-op template

.gitignore

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+node_modules
+mochawesome-report

.mocharc.json

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+{
+  "$schema": "https://json.schemastore.org/mocharc",
+  "reporter": "mochawesome",
+  "extension": [".ts"],
+  "require": ["ts-node/register"],
+  "timeout": 10000
+}

package.json

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+{
+  "name": "babel-decorators",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "scripts": {
+    "test": "mocha test/**/*.ts"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.14.8",
+    "@babel/types": "^7.14.8",
+    "@types/babel__core": "^7.1.15",
+    "@types/chai": "^4.2.21",
+    "@types/mocha": "github:whitecolor/mocha-types#da22474cf43f48a56c86f8c23a5a0ea36e295768",
+    "@types/node": "^16.4.0",
+    "@types/prettier": "^2.3.2",
+    "chai": "^4.3.4",
+    "mocha": "^9.0.2",
+    "mochawesome": "^6.2.2",
+    "prettier": "^2.3.2",
+    "ts-node": "^10.1.0",
+    "typescript": "^4.3.5"
+  }
+}

src/index.ts

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+import type * as babel from "@babel/core";
+
+export default ({ types: t }: typeof babel): babel.PluginObj => ({
+  name: "tsc-dedent",
+  visitor: {},
+});

test/index.ts

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+import { describe, it } from "mocha";
+import { expect } from "chai";
+import { transform } from "@babel/core";
+import { format } from "prettier";
+import plugin from "../src/index";
+
+const javascript = (code: TemplateStringsArray) =>
+  transform(code[0], {
+    parserOpts: {
+      plugins: ["decorators-legacy", "typescript"],
+    },
+    plugins: [plugin],
+  })!.code!;
+
+const canonize = (code: string) => format(code, { parser: "babel" }).trim();
+
+const equal = (actual: string, expected: string) => {
+  actual = canonize(actual);
+  expected = canonize(expected);
+  expect(actual).to.deep.equal(expected);
+};
+
+describe("", () => {
+  it("should do nothing", () => {
+    equal(
+      javascript`
+      class A {}
+    `,
+      /* javascript */ `
+      class A {}
+      `
+    );
+  });
+});

tsconfig.json

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+{
+  "compilerOptions": {
+    "strict": true,
+    "noEmit": true
+  }
+}