import { devAssert } from '../jsutils/devAssert' ; import { inspect } from '../jsutils/inspect' ; import { instanceOf } from '../jsutils/instanceOf' ; interface Location { line : number ; column : number ; } /**
 * A representation of source input to GraphQL. The `name` and `locationOffset` parameters are
 * optional, but they are useful for clients who store GraphQL documents in source files.
 * For example, if the GraphQL input starts at line 40 in a file named `Foo.graphql`, it might
 * be useful for `name` to be `"Foo.graphql"` and location to be `{ line: 40, column: 1 }`.
 * The `line` and `column` properties in `locationOffset` are 1-indexed.
 */ export class Source { body : string ; name : string ; locationOffset : Location ; constructor ( body , name = 'GraphQL request' , locationOffset = { line : 1 , column : 1 } ) { devAssert ( typeof body === 'string' , `Body must be a string. Received: ${ inspect ( body ) }.` ) ; this . body = body ; this . name = name ; this . locationOffset = locationOffset ; devAssert ( this . locationOffset . line > 0 , 'line in locationOffset is 1-indexed and must be positive.' ) ; devAssert ( this . locationOffset . column > 0 , 'column in locationOffset is 1-indexed and must be positive.' ) ; } get [ Symbol . toStringTag ] ( ) { return 'Source' ; } } internal export function isSource ( source ) { return instanceOf ( source , Source ) ; }