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|
// @flow strict
import { SYMBOL_TO_STRING_TAG } from '../polyfills/symbols';
import inspect from '../jsutils/inspect';
import devAssert from '../jsutils/devAssert';
import instanceOf from '../jsutils/instanceOf';
type 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: string,
name: string = 'GraphQL request',
locationOffset: Location = { 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.',
);
}
// $FlowFixMe[unsupported-syntax] Flow doesn't support computed properties yet
get [SYMBOL_TO_STRING_TAG]() {
return 'Source';
}
}
/**
* Test if the given value is a Source object.
*
* @internal
*/
declare function isSource(source: mixed): boolean %checks(source instanceof
Source);
// eslint-disable-next-line no-redeclare
export function isSource(source) {
return instanceOf(source, Source);
}
|
