@storybook/source-loader/dist/ts3.9/types.d.ts

export interface SourceLoc {
    line: number;
    col: number;
}
export interface SourceBlock {
    startBody: SourceLoc;
    endBody: SourceLoc;
    startLoc: SourceLoc;
    endLoc: SourceLoc;
}
export interface LocationsMap {
    [key: string]: SourceBlock;
}