Initial Sample.

graphql-subscription/node_modules/graphql/error/GraphQLError.d.ts

@@ -0,0 +1,142 @@
+import type { Maybe } from '../jsutils/Maybe';
+import type { ASTNode } from '../language/ast';
+import type { SourceLocation } from '../language/location';
+import type { Source } from '../language/source';
+/**
+ * Custom extensions
+ *
+ * @remarks
+ * Use a unique identifier name for your extension, for example the name of
+ * your library or project. Do not use a shortened identifier as this increases
+ * the risk of conflicts. We recommend you add at most one extension field,
+ * an object which can contain all the values you need.
+ */
+export interface GraphQLErrorExtensions {
+  [attributeName: string]: unknown;
+}
+export interface GraphQLErrorOptions {
+  nodes?: ReadonlyArray<ASTNode> | ASTNode | null;
+  source?: Maybe<Source>;
+  positions?: Maybe<ReadonlyArray<number>>;
+  path?: Maybe<ReadonlyArray<string | number>>;
+  originalError?: Maybe<
+    Error & {
+      readonly extensions?: unknown;
+    }
+  >;
+  extensions?: Maybe<GraphQLErrorExtensions>;
+}
+/**
+ * A GraphQLError describes an Error found during the parse, validate, or
+ * execute phases of performing a GraphQL operation. In addition to a message
+ * and stack trace, it also includes information about the locations in a
+ * GraphQL document and/or execution result that correspond to the Error.
+ */
+export declare class GraphQLError extends Error {
+  /**
+   * An array of `{ line, column }` locations within the source GraphQL document
+   * which correspond to this error.
+   *
+   * Errors during validation often contain multiple locations, for example to
+   * point out two things with the same name. Errors during execution include a
+   * single location, the field which produced the error.
+   *
+   * Enumerable, and appears in the result of JSON.stringify().
+   */
+  readonly locations: ReadonlyArray<SourceLocation> | undefined;
+  /**
+   * An array describing the JSON-path into the execution response which
+   * corresponds to this error. Only included for errors during execution.
+   *
+   * Enumerable, and appears in the result of JSON.stringify().
+   */
+  readonly path: ReadonlyArray<string | number> | undefined;
+  /**
+   * An array of GraphQL AST Nodes corresponding to this error.
+   */
+  readonly nodes: ReadonlyArray<ASTNode> | undefined;
+  /**
+   * The source GraphQL document for the first location of this error.
+   *
+   * Note that if this Error represents more than one node, the source may not
+   * represent nodes after the first node.
+   */
+  readonly source: Source | undefined;
+  /**
+   * An array of character offsets within the source GraphQL document
+   * which correspond to this error.
+   */
+  readonly positions: ReadonlyArray<number> | undefined;
+  /**
+   * The original error thrown from a field resolver during execution.
+   */
+  readonly originalError: Error | undefined;
+  /**
+   * Extension fields to add to the formatted error.
+   */
+  readonly extensions: GraphQLErrorExtensions;
+  constructor(message: string, options?: GraphQLErrorOptions);
+  /**
+   * @deprecated Please use the `GraphQLErrorOptions` constructor overload instead.
+   */
+  constructor(
+    message: string,
+    nodes?: ReadonlyArray<ASTNode> | ASTNode | null,
+    source?: Maybe<Source>,
+    positions?: Maybe<ReadonlyArray<number>>,
+    path?: Maybe<ReadonlyArray<string | number>>,
+    originalError?: Maybe<
+      Error & {
+        readonly extensions?: unknown;
+      }
+    >,
+    extensions?: Maybe<GraphQLErrorExtensions>,
+  );
+  get [Symbol.toStringTag](): string;
+  toString(): string;
+  toJSON(): GraphQLFormattedError;
+}
+/**
+ * See: https://spec.graphql.org/draft/#sec-Errors
+ */
+export interface GraphQLFormattedError {
+  /**
+   * A short, human-readable summary of the problem that **SHOULD NOT** change
+   * from occurrence to occurrence of the problem, except for purposes of
+   * localization.
+   */
+  readonly message: string;
+  /**
+   * If an error can be associated to a particular point in the requested
+   * GraphQL document, it should contain a list of locations.
+   */
+  readonly locations?: ReadonlyArray<SourceLocation>;
+  /**
+   * If an error can be associated to a particular field in the GraphQL result,
+   * it _must_ contain an entry with the key `path` that details the path of
+   * the response field which experienced the error. This allows clients to
+   * identify whether a null result is intentional or caused by a runtime error.
+   */
+  readonly path?: ReadonlyArray<string | number>;
+  /**
+   * Reserved for implementors to extend the protocol however they see fit,
+   * and hence there are no additional restrictions on its contents.
+   */
+  readonly extensions?: {
+    [key: string]: unknown;
+  };
+}
+/**
+ * Prints a GraphQLError to a string, representing useful location information
+ * about the error's position in the source.
+ *
+ * @deprecated Please use `error.toString` instead. Will be removed in v17
+ */
+export declare function printError(error: GraphQLError): string;
+/**
+ * Given a GraphQLError, format it according to the rules described by the
+ * Response Format, Errors section of the GraphQL Specification.
+ *
+ * @deprecated Please use `error.toJSON` instead. Will be removed in v17
+ */
+export declare function formatError(error: GraphQLError): GraphQLFormattedError;

graphql-subscription/node_modules/graphql/error/GraphQLError.js

@@ -0,0 +1,267 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true,
+});
+exports.GraphQLError = void 0;
+exports.formatError = formatError;
+exports.printError = printError;
+
+var _isObjectLike = require('../jsutils/isObjectLike.js');
+
+var _location = require('../language/location.js');
+
+var _printLocation = require('../language/printLocation.js');
+
+function toNormalizedOptions(args) {
+  const firstArg = args[0];
+
+  if (firstArg == null || 'kind' in firstArg || 'length' in firstArg) {
+    return {
+      nodes: firstArg,
+      source: args[1],
+      positions: args[2],
+      path: args[3],
+      originalError: args[4],
+      extensions: args[5],
+    };
+  }
+
+  return firstArg;
+}
+/**
+ * A GraphQLError describes an Error found during the parse, validate, or
+ * execute phases of performing a GraphQL operation. In addition to a message
+ * and stack trace, it also includes information about the locations in a
+ * GraphQL document and/or execution result that correspond to the Error.
+ */
+
+class GraphQLError extends Error {
+  /**
+   * An array of `{ line, column }` locations within the source GraphQL document
+   * which correspond to this error.
+   *
+   * Errors during validation often contain multiple locations, for example to
+   * point out two things with the same name. Errors during execution include a
+   * single location, the field which produced the error.
+   *
+   * Enumerable, and appears in the result of JSON.stringify().
+   */
+
+  /**
+   * An array describing the JSON-path into the execution response which
+   * corresponds to this error. Only included for errors during execution.
+   *
+   * Enumerable, and appears in the result of JSON.stringify().
+   */
+
+  /**
+   * An array of GraphQL AST Nodes corresponding to this error.
+   */
+
+  /**
+   * The source GraphQL document for the first location of this error.
+   *
+   * Note that if this Error represents more than one node, the source may not
+   * represent nodes after the first node.
+   */
+
+  /**
+   * An array of character offsets within the source GraphQL document
+   * which correspond to this error.
+   */
+
+  /**
+   * The original error thrown from a field resolver during execution.
+   */
+
+  /**
+   * Extension fields to add to the formatted error.
+   */
+
+  /**
+   * @deprecated Please use the `GraphQLErrorOptions` constructor overload instead.
+   */
+  constructor(message, ...rawArgs) {
+    var _this$nodes, _nodeLocations$, _ref;
+
+    const { nodes, source, positions, path, originalError, extensions } =
+      toNormalizedOptions(rawArgs);
+    super(message);
+    this.name = 'GraphQLError';
+    this.path = path !== null && path !== void 0 ? path : undefined;
+    this.originalError =
+      originalError !== null && originalError !== void 0
+        ? originalError
+        : undefined; // Compute list of blame nodes.
+
+    this.nodes = undefinedIfEmpty(
+      Array.isArray(nodes) ? nodes : nodes ? [nodes] : undefined,
+    );
+    const nodeLocations = undefinedIfEmpty(
+      (_this$nodes = this.nodes) === null || _this$nodes === void 0
+        ? void 0
+        : _this$nodes.map((node) => node.loc).filter((loc) => loc != null),
+    ); // Compute locations in the source for the given nodes/positions.
+
+    this.source =
+      source !== null && source !== void 0
+        ? source
+        : nodeLocations === null || nodeLocations === void 0
+        ? void 0
+        : (_nodeLocations$ = nodeLocations[0]) === null ||
+          _nodeLocations$ === void 0
+        ? void 0
+        : _nodeLocations$.source;
+    this.positions =
+      positions !== null && positions !== void 0
+        ? positions
+        : nodeLocations === null || nodeLocations === void 0
+        ? void 0
+        : nodeLocations.map((loc) => loc.start);
+    this.locations =
+      positions && source
+        ? positions.map((pos) => (0, _location.getLocation)(source, pos))
+        : nodeLocations === null || nodeLocations === void 0
+        ? void 0
+        : nodeLocations.map((loc) =>
+            (0, _location.getLocation)(loc.source, loc.start),
+          );
+    const originalExtensions = (0, _isObjectLike.isObjectLike)(
+      originalError === null || originalError === void 0
+        ? void 0
+        : originalError.extensions,
+    )
+      ? originalError === null || originalError === void 0
+        ? void 0
+        : originalError.extensions
+      : undefined;
+    this.extensions =
+      (_ref =
+        extensions !== null && extensions !== void 0
+          ? extensions
+          : originalExtensions) !== null && _ref !== void 0
+        ? _ref
+        : Object.create(null); // Only properties prescribed by the spec should be enumerable.
+    // Keep the rest as non-enumerable.
+
+    Object.defineProperties(this, {
+      message: {
+        writable: true,
+        enumerable: true,
+      },
+      name: {
+        enumerable: false,
+      },
+      nodes: {
+        enumerable: false,
+      },
+      source: {
+        enumerable: false,
+      },
+      positions: {
+        enumerable: false,
+      },
+      originalError: {
+        enumerable: false,
+      },
+    }); // Include (non-enumerable) stack trace.
+
+    /* c8 ignore start */
+    // FIXME: https://github.com/graphql/graphql-js/issues/2317
+
+    if (
+      originalError !== null &&
+      originalError !== void 0 &&
+      originalError.stack
+    ) {
+      Object.defineProperty(this, 'stack', {
+        value: originalError.stack,
+        writable: true,
+        configurable: true,
+      });
+    } else if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, GraphQLError);
+    } else {
+      Object.defineProperty(this, 'stack', {
+        value: Error().stack,
+        writable: true,
+        configurable: true,
+      });
+    }
+    /* c8 ignore stop */
+  }
+
+  get [Symbol.toStringTag]() {
+    return 'GraphQLError';
+  }
+
+  toString() {
+    let output = this.message;
+
+    if (this.nodes) {
+      for (const node of this.nodes) {
+        if (node.loc) {
+          output += '\n\n' + (0, _printLocation.printLocation)(node.loc);
+        }
+      }
+    } else if (this.source && this.locations) {
+      for (const location of this.locations) {
+        output +=
+          '\n\n' +
+          (0, _printLocation.printSourceLocation)(this.source, location);
+      }
+    }
+
+    return output;
+  }
+
+  toJSON() {
+    const formattedError = {
+      message: this.message,
+    };
+
+    if (this.locations != null) {
+      formattedError.locations = this.locations;
+    }
+
+    if (this.path != null) {
+      formattedError.path = this.path;
+    }
+
+    if (this.extensions != null && Object.keys(this.extensions).length > 0) {
+      formattedError.extensions = this.extensions;
+    }
+
+    return formattedError;
+  }
+}
+
+exports.GraphQLError = GraphQLError;
+
+function undefinedIfEmpty(array) {
+  return array === undefined || array.length === 0 ? undefined : array;
+}
+/**
+ * See: https://spec.graphql.org/draft/#sec-Errors
+ */
+
+/**
+ * Prints a GraphQLError to a string, representing useful location information
+ * about the error's position in the source.
+ *
+ * @deprecated Please use `error.toString` instead. Will be removed in v17
+ */
+function printError(error) {
+  return error.toString();
+}
+/**
+ * Given a GraphQLError, format it according to the rules described by the
+ * Response Format, Errors section of the GraphQL Specification.
+ *
+ * @deprecated Please use `error.toJSON` instead. Will be removed in v17
+ */
+
+function formatError(error) {
+  return error.toJSON();
+}

graphql-subscription/node_modules/graphql/error/GraphQLError.mjs

@@ -0,0 +1,253 @@
+import { isObjectLike } from '../jsutils/isObjectLike.mjs';
+import { getLocation } from '../language/location.mjs';
+import {
+  printLocation,
+  printSourceLocation,
+} from '../language/printLocation.mjs';
+
+function toNormalizedOptions(args) {
+  const firstArg = args[0];
+
+  if (firstArg == null || 'kind' in firstArg || 'length' in firstArg) {
+    return {
+      nodes: firstArg,
+      source: args[1],
+      positions: args[2],
+      path: args[3],
+      originalError: args[4],
+      extensions: args[5],
+    };
+  }
+
+  return firstArg;
+}
+/**
+ * A GraphQLError describes an Error found during the parse, validate, or
+ * execute phases of performing a GraphQL operation. In addition to a message
+ * and stack trace, it also includes information about the locations in a
+ * GraphQL document and/or execution result that correspond to the Error.
+ */
+
+export class GraphQLError extends Error {
+  /**
+   * An array of `{ line, column }` locations within the source GraphQL document
+   * which correspond to this error.
+   *
+   * Errors during validation often contain multiple locations, for example to
+   * point out two things with the same name. Errors during execution include a
+   * single location, the field which produced the error.
+   *
+   * Enumerable, and appears in the result of JSON.stringify().
+   */
+
+  /**
+   * An array describing the JSON-path into the execution response which
+   * corresponds to this error. Only included for errors during execution.
+   *
+   * Enumerable, and appears in the result of JSON.stringify().
+   */
+
+  /**
+   * An array of GraphQL AST Nodes corresponding to this error.
+   */
+
+  /**
+   * The source GraphQL document for the first location of this error.
+   *
+   * Note that if this Error represents more than one node, the source may not
+   * represent nodes after the first node.
+   */
+
+  /**
+   * An array of character offsets within the source GraphQL document
+   * which correspond to this error.
+   */
+
+  /**
+   * The original error thrown from a field resolver during execution.
+   */
+
+  /**
+   * Extension fields to add to the formatted error.
+   */
+
+  /**
+   * @deprecated Please use the `GraphQLErrorOptions` constructor overload instead.
+   */
+  constructor(message, ...rawArgs) {
+    var _this$nodes, _nodeLocations$, _ref;
+
+    const { nodes, source, positions, path, originalError, extensions } =
+      toNormalizedOptions(rawArgs);
+    super(message);
+    this.name = 'GraphQLError';
+    this.path = path !== null && path !== void 0 ? path : undefined;
+    this.originalError =
+      originalError !== null && originalError !== void 0
+        ? originalError
+        : undefined; // Compute list of blame nodes.
+
+    this.nodes = undefinedIfEmpty(
+      Array.isArray(nodes) ? nodes : nodes ? [nodes] : undefined,
+    );
+    const nodeLocations = undefinedIfEmpty(
+      (_this$nodes = this.nodes) === null || _this$nodes === void 0
+        ? void 0
+        : _this$nodes.map((node) => node.loc).filter((loc) => loc != null),
+    ); // Compute locations in the source for the given nodes/positions.
+
+    this.source =
+      source !== null && source !== void 0
+        ? source
+        : nodeLocations === null || nodeLocations === void 0
+        ? void 0
+        : (_nodeLocations$ = nodeLocations[0]) === null ||
+          _nodeLocations$ === void 0
+        ? void 0
+        : _nodeLocations$.source;
+    this.positions =
+      positions !== null && positions !== void 0
+        ? positions
+        : nodeLocations === null || nodeLocations === void 0
+        ? void 0
+        : nodeLocations.map((loc) => loc.start);
+    this.locations =
+      positions && source
+        ? positions.map((pos) => getLocation(source, pos))
+        : nodeLocations === null || nodeLocations === void 0
+        ? void 0
+        : nodeLocations.map((loc) => getLocation(loc.source, loc.start));
+    const originalExtensions = isObjectLike(
+      originalError === null || originalError === void 0
+        ? void 0
+        : originalError.extensions,
+    )
+      ? originalError === null || originalError === void 0
+        ? void 0
+        : originalError.extensions
+      : undefined;
+    this.extensions =
+      (_ref =
+        extensions !== null && extensions !== void 0
+          ? extensions
+          : originalExtensions) !== null && _ref !== void 0
+        ? _ref
+        : Object.create(null); // Only properties prescribed by the spec should be enumerable.
+    // Keep the rest as non-enumerable.
+
+    Object.defineProperties(this, {
+      message: {
+        writable: true,
+        enumerable: true,
+      },
+      name: {
+        enumerable: false,
+      },
+      nodes: {
+        enumerable: false,
+      },
+      source: {
+        enumerable: false,
+      },
+      positions: {
+        enumerable: false,
+      },
+      originalError: {
+        enumerable: false,
+      },
+    }); // Include (non-enumerable) stack trace.
+
+    /* c8 ignore start */
+    // FIXME: https://github.com/graphql/graphql-js/issues/2317
+
+    if (
+      originalError !== null &&
+      originalError !== void 0 &&
+      originalError.stack
+    ) {
+      Object.defineProperty(this, 'stack', {
+        value: originalError.stack,
+        writable: true,
+        configurable: true,
+      });
+    } else if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, GraphQLError);
+    } else {
+      Object.defineProperty(this, 'stack', {
+        value: Error().stack,
+        writable: true,
+        configurable: true,
+      });
+    }
+    /* c8 ignore stop */
+  }
+
+  get [Symbol.toStringTag]() {
+    return 'GraphQLError';
+  }
+
+  toString() {
+    let output = this.message;
+
+    if (this.nodes) {
+      for (const node of this.nodes) {
+        if (node.loc) {
+          output += '\n\n' + printLocation(node.loc);
+        }
+      }
+    } else if (this.source && this.locations) {
+      for (const location of this.locations) {
+        output += '\n\n' + printSourceLocation(this.source, location);
+      }
+    }
+
+    return output;
+  }
+
+  toJSON() {
+    const formattedError = {
+      message: this.message,
+    };
+
+    if (this.locations != null) {
+      formattedError.locations = this.locations;
+    }
+
+    if (this.path != null) {
+      formattedError.path = this.path;
+    }
+
+    if (this.extensions != null && Object.keys(this.extensions).length > 0) {
+      formattedError.extensions = this.extensions;
+    }
+
+    return formattedError;
+  }
+}
+
+function undefinedIfEmpty(array) {
+  return array === undefined || array.length === 0 ? undefined : array;
+}
+/**
+ * See: https://spec.graphql.org/draft/#sec-Errors
+ */
+
+/**
+ * Prints a GraphQLError to a string, representing useful location information
+ * about the error's position in the source.
+ *
+ * @deprecated Please use `error.toString` instead. Will be removed in v17
+ */
+export function printError(error) {
+  return error.toString();
+}
+/**
+ * Given a GraphQLError, format it according to the rules described by the
+ * Response Format, Errors section of the GraphQL Specification.
+ *
+ * @deprecated Please use `error.toJSON` instead. Will be removed in v17
+ */
+
+export function formatError(error) {
+  return error.toJSON();
+}

graphql-subscription/node_modules/graphql/error/index.d.ts

@@ -0,0 +1,8 @@
+export { GraphQLError, printError, formatError } from './GraphQLError';
+export type {
+  GraphQLErrorOptions,
+  GraphQLFormattedError,
+  GraphQLErrorExtensions,
+} from './GraphQLError';
+export { syntaxError } from './syntaxError';
+export { locatedError } from './locatedError';

graphql-subscription/node_modules/graphql/error/index.js

@@ -0,0 +1,41 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true,
+});
+Object.defineProperty(exports, 'GraphQLError', {
+  enumerable: true,
+  get: function () {
+    return _GraphQLError.GraphQLError;
+  },
+});
+Object.defineProperty(exports, 'formatError', {
+  enumerable: true,
+  get: function () {
+    return _GraphQLError.formatError;
+  },
+});
+Object.defineProperty(exports, 'locatedError', {
+  enumerable: true,
+  get: function () {
+    return _locatedError.locatedError;
+  },
+});
+Object.defineProperty(exports, 'printError', {
+  enumerable: true,
+  get: function () {
+    return _GraphQLError.printError;
+  },
+});
+Object.defineProperty(exports, 'syntaxError', {
+  enumerable: true,
+  get: function () {
+    return _syntaxError.syntaxError;
+  },
+});
+
+var _GraphQLError = require('./GraphQLError.js');
+
+var _syntaxError = require('./syntaxError.js');
+
+var _locatedError = require('./locatedError.js');

graphql-subscription/node_modules/graphql/error/index.mjs

@@ -0,0 +1,3 @@
+export { GraphQLError, printError, formatError } from './GraphQLError.mjs';
+export { syntaxError } from './syntaxError.mjs';
+export { locatedError } from './locatedError.mjs';

graphql-subscription/node_modules/graphql/error/locatedError.d.ts

@@ -0,0 +1,13 @@
+import type { Maybe } from '../jsutils/Maybe';
+import type { ASTNode } from '../language/ast';
+import { GraphQLError } from './GraphQLError';
+/**
+ * Given an arbitrary value, presumably thrown while attempting to execute a
+ * GraphQL operation, produce a new GraphQLError aware of the location in the
+ * document responsible for the original Error.
+ */
+export declare function locatedError(
+  rawOriginalError: unknown,
+  nodes: ASTNode | ReadonlyArray<ASTNode> | undefined | null,
+  path?: Maybe<ReadonlyArray<string | number>>,
+): GraphQLError;

graphql-subscription/node_modules/graphql/error/locatedError.js

@@ -0,0 +1,40 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true,
+});
+exports.locatedError = locatedError;
+
+var _toError = require('../jsutils/toError.js');
+
+var _GraphQLError = require('./GraphQLError.js');
+
+/**
+ * Given an arbitrary value, presumably thrown while attempting to execute a
+ * GraphQL operation, produce a new GraphQLError aware of the location in the
+ * document responsible for the original Error.
+ */
+function locatedError(rawOriginalError, nodes, path) {
+  var _nodes;
+
+  const originalError = (0, _toError.toError)(rawOriginalError); // Note: this uses a brand-check to support GraphQL errors originating from other contexts.
+
+  if (isLocatedGraphQLError(originalError)) {
+    return originalError;
+  }
+
+  return new _GraphQLError.GraphQLError(originalError.message, {
+    nodes:
+      (_nodes = originalError.nodes) !== null && _nodes !== void 0
+        ? _nodes
+        : nodes,
+    source: originalError.source,
+    positions: originalError.positions,
+    path,
+    originalError,
+  });
+}
+
+function isLocatedGraphQLError(error) {
+  return Array.isArray(error.path);
+}

graphql-subscription/node_modules/graphql/error/locatedError.mjs

@@ -0,0 +1,32 @@
+import { toError } from '../jsutils/toError.mjs';
+import { GraphQLError } from './GraphQLError.mjs';
+/**
+ * Given an arbitrary value, presumably thrown while attempting to execute a
+ * GraphQL operation, produce a new GraphQLError aware of the location in the
+ * document responsible for the original Error.
+ */
+
+export function locatedError(rawOriginalError, nodes, path) {
+  var _nodes;
+
+  const originalError = toError(rawOriginalError); // Note: this uses a brand-check to support GraphQL errors originating from other contexts.
+
+  if (isLocatedGraphQLError(originalError)) {
+    return originalError;
+  }
+
+  return new GraphQLError(originalError.message, {
+    nodes:
+      (_nodes = originalError.nodes) !== null && _nodes !== void 0
+        ? _nodes
+        : nodes,
+    source: originalError.source,
+    positions: originalError.positions,
+    path,
+    originalError,
+  });
+}
+
+function isLocatedGraphQLError(error) {
+  return Array.isArray(error.path);
+}

graphql-subscription/node_modules/graphql/error/syntaxError.d.ts

@@ -0,0 +1,11 @@
+import type { Source } from '../language/source';
+import { GraphQLError } from './GraphQLError';
+/**
+ * Produces a GraphQLError representing a syntax error, containing useful
+ * descriptive information about the syntax error's position in the source.
+ */
+export declare function syntaxError(
+  source: Source,
+  position: number,
+  description: string,
+): GraphQLError;

graphql-subscription/node_modules/graphql/error/syntaxError.js

@@ -0,0 +1,19 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true,
+});
+exports.syntaxError = syntaxError;
+
+var _GraphQLError = require('./GraphQLError.js');
+
+/**
+ * Produces a GraphQLError representing a syntax error, containing useful
+ * descriptive information about the syntax error's position in the source.
+ */
+function syntaxError(source, position, description) {
+  return new _GraphQLError.GraphQLError(`Syntax Error: ${description}`, {
+    source,
+    positions: [position],
+  });
+}

graphql-subscription/node_modules/graphql/error/syntaxError.mjs

@@ -0,0 +1,12 @@
+import { GraphQLError } from './GraphQLError.mjs';
+/**
+ * Produces a GraphQLError representing a syntax error, containing useful
+ * descriptive information about the syntax error's position in the source.
+ */
+
+export function syntaxError(source, position, description) {
+  return new GraphQLError(`Syntax Error: ${description}`, {
+    source,
+    positions: [position],
+  });
+}