import ts = require('typescript');

function printMessage(messageText: string | ts.DiagnosticMessageChain): string {
    if (messageText['messageText']) {
        return printMessage((<ts.DiagnosticMessageChain>messageText).messageText);
    } else {
        return messageText.toString();
    }
}


export function printDiagnostic(diagnostic: ts.Diagnostic) {
    const linePos: ts.LineAndCharacter = diagnostic.file.getLineAndCharacterOfPosition(diagnostic.start);
    const message: string = printMessage(diagnostic.messageText);
    return `${diagnostic.file.fileName} -> ${linePos.line + 1}:${linePos.character} ${message}`;
}