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TextEncoder

The TextEncoder interface takes a stream of code points as input and emits a stream of UTF-8 bytes.

Note: This feature is available in Web Workers

TextEncoder(): Returns a newly constructed TextEncoder that will generate a byte stream with UTF-8 encoding.

The TextEncoder interface doesn't inherit any properties.

The TextEncoder interface doesn't inherit any methods.

TextEncoder.encode(): Takes a string as input, and returns a Uint8Array containing UTF-8 encoded text.
TextEncoder.encodeInto(): Takes a string to encode and a destination Uint8Array to put resulting UTF-8 encoded text into, and returns an object indicating the progress of the encoding. This is potentially more performant than the older encode() method.

const encoder = new TextEncoder();
const view = encoder.encode("€");
console.log(view); // Uint8Array(3) [226, 130, 172]

Specification
Encoding Standard # interface-textencoder