Minimal compiler for typescript files

script.js

const ts = require('typescript');
const tsConfig = require('./tsconfig.json');

const config = tsConfig.compilerOptions;

function compile(fileNames, options) {
    if (fileNames.filter(Boolean).length === 0) {
        console.log('No files');
        return;
    }
    let program = ts.createProgram(fileNames, options);
    let emitResult = program.emit();

    let allDiagnostics = ts.getPreEmitDiagnostics(program).concat(emitResult.diagnostics);

    allDiagnostics.forEach(diagnostic => {
        if (diagnostic.file) {
            let { line, character } = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
            let message = ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n');
            console.log(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);
        } else {
            console.log(`${ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n')}`);
        }
    });

    let exitCode = emitResult.emitSkipped ? 1 : 0;
    console.log(`Process exiting with code '${exitCode}'.`);
    process.exit(exitCode);
}

compile(process.argv.slice(2), { ...config, noEmit: true });