Method appendSpannedString

src/SpannedString.ts:68–99

(other: SpannedString<T>)

    }

    appendSpannedString(other: SpannedString<T>): SpannedString<T> {
        this._string = this._string.concat(other._string);

        // The trailing span marker of this string and leading span marker of
        // the other string will overlap, so we need to merge it
        const spanMarkers = this._spanMarkers.concat(
            new Array(other._spanMarkers.length - 1)
        );
        const overlappingSpanIndex = this._spanMarkers.length - 1;
        for (
            let otherIndex = 0;
            otherIndex < other._spanMarkers.length;
            otherIndex++
        ) {
            const otherSpans = other._spanMarkers[otherIndex];
            if (otherSpans) {
                const index = otherIndex + overlappingSpanIndex;
                spanMarkers[index] = spanMarkers[index] ?? [];
                spanMarkers[index]?.push(
                    ...otherSpans.map((span) => ({
                        ...span,
                        // Remap ids to avoid collisions
                        id: span.id + this._nextId,
                    }))
                );
            }
        }
        this._spanMarkers = spanMarkers;
        this._nextId = this._nextId + other._nextId;

        return this;
    }

    slice(
        startIndex: number,