Function installPrettier

tests/config/install-prettier.js:82–160

(packageDirectory)

}

function installPrettier(packageDirectory) {
  const start = performance.now();
  const temporaryDirectory = createTemporaryDirectory();
  directoriesToClean.add(temporaryDirectory);
  const fileName = spawn("npm", ["pack"], {
    cwd: packageDirectory,
    encoding: "utf8",
  }).stdout.trim();
  const file = path.join(packageDirectory, fileName);
  const packed = path.join(temporaryDirectory, fileName);
  fs.copyFileSync(file, packed);
  fs.unlinkSync(file);

  const runNpmClient = (args) => {
    const result = spawn(client, args, {
      cwd: temporaryDirectory,
      encoding: "utf8",
    });

    if (result.status === 0) {
      return result;
    }

    const { stdout, stderr } = result;
    const output = [stdout, stderr].filter(Boolean).join("\n");

    throw new Error(outdent`
      Failed to execute ${picocolors.blue([client, ...args].join(" "))}.
      ${output}
    `);
  };

  runNpmClient(client === "pnpm" ? ["init"] : ["init", "-y"]);

  switch (client) {
    case "npm":
      // npm fails when engine requirement only with `--engine-strict`
      runNpmClient(["install", packed, "--engine-strict"]);
      break;
    case "pnpm":
      // fails engine mismatch
      runNpmClient(["add", packed, "--engine-strict"]);
      break;
    case "yarn": {
      // Yarn currently doesn't fail on engine requirement
      // https://github.com/yarnpkg/berry/issues/1177
      const { stdout } = runNpmClient(["--version"]);
      if (!/^3\./.test(stdout)) {
        runNpmClient(["config", "set", "npmMinimalAgeGate", "0"]);
      }

      runNpmClient(["config", "set", "nodeLinker", "node-modules"]);
      runNpmClient(["add", `prettier@file:${packed}`]);
      break;
    }
    // No default
  }