import * as tsm from 'ts-morph';

export function getProject({
    fileSystem,
    pattern = '**/*.ts',
}: {
    fileSystem: tsm.FileSystemHost;
    pattern?: string;
}): tsm.Project {
    const project = new tsm.Project({
        fileSystem,
        compilerOptions: {
            // See https://github.com/dsherret/ts-morph/issues/938
            // and https://github.com/microsoft/TypeScript/blob/master/lib/lib.esnext.full.d.ts
            lib: ['lib.esnext.full.d.ts'],
        },
    });

    project.addSourceFilesAtPaths(pattern);

    return project;
}