highlight-error

This is a small utility that helps you format error positions in code.

Installation

npm install --save highlight-error

Usage

const highlightError = require('highlight-error');

const code = `function a() {
  return a + *;
}`;

console.log(highlightError(code, {
  line: 2,
  column: 13
}));

This will print:

If you want the output without colors just add the option:

console.log(highlightError(code, {
  line: 2,
  column: 13
}, { colors: false }));

This will print:

  1 | function a() {
> 2 |   return a + *;
                   ^
  3 | }

API

highlightError

highlightError(
  code: string,
  pos: Location | number,
  options?: Options
): string

The first argument is the code you want to highlight the error in.

The second argument is the error position. Can be a number (meaning the position from the start of the code) or a { line, column } object with 1-indexed line.

The third argument is options:

• options.neighborLinesCount (default: 2): how many lines above and below the selected line should be printed.
• options.colors (default: true): whether to use colors for the output or not.