Function stripBlock

packages/localize/src/localize/src/localize.ts:178–182

* Strip a delimited "block" from the start of the `messagePart`, if it is found. * * If a marker character (:) actually appears in the content at the start of a tagged string or * after a substitution expression, where a block has not been provided the character must be * escaped with a backslas

(messagePart: string, rawMessagePart: string)

 * @throws an error if the block is unterminated
 */
function stripBlock(messagePart: string, rawMessagePart: string) {
  return rawMessagePart.charAt(0) === BLOCK_MARKER
    ? messagePart.substring(findEndOfBlock(messagePart, rawMessagePart) + 1)
    : messagePart;
}