import { ChildProcess, fork } from "child_process";

import * as path from "path";

jest.setTimeout(20000);

export const resolveFixture = (name: string) => path.resolve(__dirname, "__fixtures__", name);

const cliPath = path.join(__dirname, "../../src/tstl.ts");

const defaultArgs = ["--skipLibCheck", "--types", "node"];

export function forkCli(args: string[]): ChildProcess {

return fork(cliPath, [...defaultArgs, ...args], {

stdio: "pipe",

execArgv: ["--require", "ts-node/register/transpile-only"],

});

}

export interface CliOutput {

exitCode: number;

output: string;

}

export async function collectCliOutput(child: ChildProcess) {

let output = "";

child.stdout!.on("data", (data: Buffer) => (output += data.toString()));

child.stderr!.on("data", (data: Buffer) => (output += data.toString()));

return new Promise<CliOutput>(resolve => {

child.on("close", exitCode => resolve({ exitCode, output }));

});

}

export async function runCli(args: string[]) {

return collectCliOutput(forkCli(args));

}