node_modules/graphql/language/source.js.flow

// @flow strict

import { SYMBOL_TO_STRING_TAG } from '../polyfills/symbols';

import devAssert from '../jsutils/devAssert';

type Location = {|
  line: number,
  column: number,
|};

/**
 * A representation of source input to GraphQL.
 * `name` and `locationOffset` are optional. 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: 0 }`.
 * line and column in locationOffset are 1-indexed
 */
export class Source {
  body: string;
  name: string;
  locationOffset: Location;

  constructor(
    body: string,
    name: string = 'GraphQL request',
    locationOffset: Location = { line: 1, column: 1 },
  ): void {
    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.',
    );
  }

  // $FlowFixMe Flow doesn't support computed properties yet
  get [SYMBOL_TO_STRING_TAG]() {
    return 'Source';
  }
}