patch-jest.js

#!/usr/bin/env node
"use strict";

const childProcess = require("child_process");
const jestPackageJson = require("jest/package.json");
const path = require("path");
const process = require("process");

// This small program is a proxy for the "jest" program defined by the Jest package. The proxy is
// necessary because Jest is not a dependency of the Expo package. Some package managers (e.g., npm)
// don't hoist binaries provided by nested dependencies, so to consistently define a program named
// "jest" we use this proxy script.
//
// We forward all arguments and stdio streams to the real "jest" program and exit with the same
// signal or status code.
//
// If you need to run Jest with the JS debugger enabled, run Jest directly. It is usually under
// node_modules/jest/bin/jest.js.
const jestPackagePath = path.dirname(require.resolve("jest/package.json"));
const jestProgramPath = path.resolve(
  jestPackagePath,
  jestPackageJson.bin.jest || jestPackageJson.bin
);
const jestProgramArgs = process.argv.slice(2);
const jestWithArgs = [jestProgramPath].concat(jestProgramArgs);
const result = childProcess.spawnSync("node", jestWithArgs, {
  stdio: "inherit",
});

if (result.signal) {
  process.kill(process.pid, result.signal);
} else {
  process.exit(result.status);
}