Function getBase64ImageHeader

get the header of a base64 image.

Example

import { assertEquals } from "jsr:@std/assert"

const
	img_uri = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAD...",
	img_header = getBase64ImageHeader(img_uri)

assertEquals(img_header, "data:image/png;base64,")
  • getBase64ImageHeader(
        str:
            | `data:image/gif;base64,${string}`
            | `data:image/jpeg;base64,${string}`
            | `data:image/jpg;base64,${string}`
            | `data:image/png;base64,${string}`
            | `data:image/svg+xml;base64,${string}`
            | `data:image/webp;base64,${string}`,
    ): | "data:image/gif;base64,"
    | "data:image/jpeg;base64,"
    | "data:image/jpg;base64,"
    | "data:image/png;base64,"
    | "data:image/svg+xml;base64,"
    | "data:image/webp;base64,"

    Parameters

    • str:
          | `data:image/gif;base64,${string}`
          | `data:image/jpeg;base64,${string}`
          | `data:image/jpg;base64,${string}`
          | `data:image/png;base64,${string}`
          | `data:image/svg+xml;base64,${string}`
          | `data:image/webp;base64,${string}`

    Returns
        | "data:image/gif;base64,"
        | "data:image/jpeg;base64,"
        | "data:image/jpg;base64,"
        | "data:image/png;base64,"
        | "data:image/svg+xml;base64,"
        | "data:image/webp;base64,"

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