Just use Buffer#includes(). It has been available since Node.js 6.

Node.js buffer.includes() ponyfill

$ npm install --save buffer-includes

const bufferIncludes = require('buffer-includes');

bufferIncludes(new Buffer('unicorn'), 'corn');
//=> true

See the buffer.includes() docs for more details.

• buf-indexof - Node.js buffer.indexOf() ponyfill
• buffer-equals - Node.js buffer.equals() ponyfill
• buf-compare - Node.js Buffer.compare() ponyfill

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