const ts = require('typescript');

const content = '0 as const';

const host = ts.createCompilerHost({})
const originalReadFile = host.readFile;
host.readFile = (fileName) => fileName === 'main.ts' ? content : originalReadFile(fileName);

const program = ts.createProgram({ host, rootNames: ['main.ts'], options: { types: [] } });
const typeChecker = program.getDiagnosticsProducingTypeChecker();
const sourceFile = program.getSourceFile('main.ts');

typeChecker.getTypeAtLocation(sourceFile.statements[0].expression.type)

console.log(program.getSemanticDiagnostics());