overleaf/services/web/frontend/js/features/source-editor/utils/position.ts

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import { Text } from '@codemirror/state'
export const findValidPosition = (
doc: Text,
lineNumber: number, // 1-indexed
columnNumber: number // 0-indexed
): number => {
const lines = doc.lines
if (lineNumber > lines) {
// end of the doc
return doc.length
}
const line = doc.line(lineNumber)
// requested line and column, or the end of the line
return Math.min(line.from + columnNumber, line.to)
}