Function parseTemplateElement

packages/babel-parser/src/parser/expression.ts:2013–2047

(isTagged: boolean)

  // Parse template expression.

  parseTemplateElement(isTagged: boolean): N.TemplateElement {
    const { start, startLoc, end, value } = this.state;
    const elemStart = start + 1;
    const elem = this.startNodeAt<N.TemplateElement>(
      createPositionWithColumnOffset(startLoc, 1),
    );
    if (value === null) {
      if (!isTagged) {
        this.raise(
          Errors.InvalidEscapeSequenceTemplate,
          // FIXME: Adding 1 is probably wrong.
          createPositionWithColumnOffset(
            this.state.firstInvalidTemplateEscapePos!,
            1,
          ),
        );
      }
    }

    const isTail = this.match(tt.templateTail);
    const endOffset = isTail ? -1 : -2;
    const elemEnd = end + endOffset;
    elem.value = {
      raw: this.input.slice(elemStart, elemEnd).replace(/\r\n?/g, "\n"),
      cooked: value === null ? null : value.slice(1, endOffset),
    };
    elem.tail = isTail;
    this.next();
    const finishedNode = this.finishNode(elem, "TemplateElement");
    this.resetEndLocation(
      finishedNode,
      createPositionWithColumnOffset(this.state.lastTokEndLoc!, endOffset),
    );
    return finishedNode;
  }

  // https://tc39.es/ecma262/#prod-TemplateLiteral
  parseTemplate(this: Parser, isTagged: boolean): N.TemplateLiteral {