mirror of
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53 lines
2.0 KiB
Plaintext
53 lines
2.0 KiB
Plaintext
// @flow strict
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import inspect from './inspect';
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/**
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* A replacement for instanceof which includes an error warning when multi-realm
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* constructors are detected.
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*/
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declare function instanceOf(
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value: mixed,
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constructor: mixed,
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): boolean %checks(value instanceof constructor);
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// See: https://expressjs.com/en/advanced/best-practice-performance.html#set-node_env-to-production
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// See: https://webpack.js.org/guides/production/
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export default process.env.NODE_ENV === 'production'
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? // istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2317')
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// eslint-disable-next-line no-shadow
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function instanceOf(value: mixed, constructor: mixed): boolean {
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return value instanceof constructor;
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}
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: // eslint-disable-next-line no-shadow
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function instanceOf(value: any, constructor: any): boolean {
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if (value instanceof constructor) {
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return true;
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}
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if (typeof value === 'object' && value !== null) {
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const className = constructor.prototype[Symbol.toStringTag];
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const valueClassName =
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// We still need to support constructor's name to detect conflicts with older versions of this library.
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Symbol.toStringTag in value
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? value[Symbol.toStringTag]
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: value.constructor?.name;
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if (className === valueClassName) {
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const stringifiedValue = inspect(value);
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throw new Error(
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`Cannot use ${className} "${stringifiedValue}" from another module or realm.
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Ensure that there is only one instance of "graphql" in the node_modules
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directory. If different versions of "graphql" are the dependencies of other
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relied on modules, use "resolutions" to ensure only one version is installed.
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https://yarnpkg.com/en/docs/selective-version-resolutions
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Duplicate "graphql" modules cannot be used at the same time since different
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versions may have different capabilities and behavior. The data from one
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version used in the function from another could produce confusing and
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spurious results.`,
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);
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}
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}
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return false;
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};
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