@babel/helper-transform-fixture-test-runner

buildParallelProcessTests: (
    name: string,
    tests: ProcessTest[]
) => (curr: number, total: number) => void;

buildProcessTests: (
    dir: string | URL,
    beforeHook: ProcessTestBeforeHook,
    afterHook?: ProcessTestAfterHook
) => ProcessTest[];

createTestContext: () => vm.Context;

export_default: (
    fixturesLoc: string | URL,
    name: string,
    suiteOpts?: SuiteOptions,
    taskOpts?: TaskOptions,
    dynamicOpts?: (options: TaskOptions, task: Test) => void
) => void;

runCodeInTestContext: (
    code: string,
    opts: { filename: string | URL; timeout?: number },
    context?: vm.Context
) => any;

type ProcessTest = {
    suiteName: string;
    testName: string;
    skip: boolean;
    fn: Function;
    opts: ProcessTestOpts;
    binLoc?: string;
};

type ProcessTestAfterHook = (
    test: ProcessTest,
    tmpDir: string,
    stdout: string,
    stderr: string
) => {
    stdout: string;
    stderr: string;
};

type ProcessTestBeforeHook = (test: ProcessTest, tmpDir: string) => void;

type ProcessTestOpts = {
    args: string[];
    executor?: string;
    ipc?: boolean;
    ipcMessage?: string;
    stdout: string;
    stderr: string;
    stdin: string;
    stdoutPath: string;
    stderrPath: string;
    stdoutContains?: boolean;
    stderrContains?: boolean;
    testLoc: string;
    outFiles: Record<string, string>;
    inFiles: Record<string, string>;
    noBabelrc?: boolean;
    minNodeVersion?: number;
    env?: Record<string, string>;
    BABEL_8_BREAKING?: boolean;
};

type SuiteOptions = {
    ignoreSuites?: string[];
    ignoreTasks?: string[];
};