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- // @flow strict
- declare function instanceOf(
- value: mixed,
- constructor: mixed,
- ): boolean %checks(value instanceof constructor);
- // See: https://expressjs.com/en/advanced/best-practice-performance.html#set-node_env-to-production
- // See: https://webpack.js.org/guides/production/
- export default process.env.NODE_ENV === 'production'
- ? // eslint-disable-next-line no-shadow
- function instanceOf(value: mixed, constructor: mixed) {
- return value instanceof constructor;
- }
- : // eslint-disable-next-line no-shadow
- function instanceOf(value: any, constructor: any) {
- if (value instanceof constructor) {
- return true;
- }
- if (value) {
- const valueClass = value.constructor;
- const className = constructor.name;
- if (className && valueClass && valueClass.name === className) {
- throw new Error(
- `Cannot use ${className} "${value}" from another module or realm.
- Ensure that there is only one instance of "graphql" in the node_modules
- directory. If different versions of "graphql" are the dependencies of other
- relied on modules, use "resolutions" to ensure only one version is installed.
- https://yarnpkg.com/en/docs/selective-version-resolutions
- Duplicate "graphql" modules cannot be used at the same time since different
- versions may have different capabilities and behavior. The data from one
- version used in the function from another could produce confusing and
- spurious results.`,
- );
- }
- }
- return false;
- };
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