This is a simple module for applying lean text diff delta patches created by textdiff-create.

See below.

Assuming you've correctly installed the npm module with npm i textdiff-patch [--save|--save-dev]:

const applyPatch = require('textdiff-patch');

const v1 = 'The sleepy brown fox';
const delta = [
      [0, 4],
      [-1, 6],
      [1, 'quick'],
      [0, 10],
      [1, ' jumps over the lazy dog']
    ];

const v2 = applyPatch(v1, delta);

console.log(v2);

The script will produce the following output:

The quick brown fox jumps over the lazy dog

Have a look at textdiff-create for more info.

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