@jsdocs-io/extractor/src/api-extractor/get-start-line-number.ts

import * as tsm from 'ts-morph';

export function getStartLineNumber({
    declaration,
}: {
    declaration: tsm.Node;
}): number {
    if (tsm.Node.isSourceFile(declaration)) {
        return 1;
    }

    return declaration.getStartLineNumber();
}