@apollo/client
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A fully-featured caching GraphQL client.
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forward(op) : Observable.of()) as Observable<FetchResult>;\n}\n\nfunction toLink(handler: RequestHandler | ApolloLink) {\n return typeof handler === 'function' ? new ApolloLink(handler) : handler;\n}\n\nfunction isTerminating(link: ApolloLink): boolean {\n return link.request.length <= 1;\n}\n\nclass LinkError extends Error {\n public link?: ApolloLink;\n constructor(message?: string, link?: ApolloLink) {\n super(message);\n this.link = link;\n }\n}\n\nexport class ApolloLink {\n public static empty(): ApolloLink {\n return new ApolloLink(() => Observable.of());\n }\n\n public static from(links: (ApolloLink | RequestHandler)[]): ApolloLink {\n if (links.length === 0) return ApolloLink.empty();\n return links.map(toLink).reduce((x, y) => x.concat(y)) as ApolloLink;\n }\n\n public static split(\n test: (op: Operation) => boolean,\n left: ApolloLink | RequestHandler,\n right?: ApolloLink | RequestHandler,\n ): ApolloLink {\n const leftLink = toLink(left);\n const rightLink = toLink(right || new ApolloLink(passthrough));\n\n if (isTerminating(leftLink) && isTerminating(rightLink)) {\n return new ApolloLink(operation => {\n return test(operation)\n ? leftLink.request(operation) || Observable.of()\n : rightLink.request(operation) || Observable.of();\n });\n } else {\n return new ApolloLink((operation, forward) => {\n return test(operation)\n ? leftLink.request(operation, forward) || Observable.of()\n : rightLink.request(operation, forward) || Observable.of();\n });\n }\n }\n\n public static execute(\n link: ApolloLink,\n operation: GraphQLRequest,\n ): Observable<FetchResult> {\n return (\n link.request(\n createOperation(\n operation.context,\n transformOperation(validateOperation(operation)),\n ),\n ) || Observable.of()\n );\n }\n\n public static concat(\n first: ApolloLink | RequestHandler,\n second: ApolloLink | RequestHandler,\n ) {\n const firstLink = toLink(first);\n if (isTerminating(firstLink)) {\n invariant.warn(\n new LinkError(\n `You are calling concat on a terminating link, which will have no effect`,\n firstLink,\n ),\n );\n return firstLink;\n }\n const nextLink = toLink(second);\n\n if (isTerminating(nextLink)) {\n return new ApolloLink(\n operation =>\n firstLink.request(\n operation,\n op => nextLink.request(op) || Observable.of(),\n ) || Observable.of(),\n );\n } else {\n return new ApolloLink((operation, forward) => {\n return (\n firstLink.request(operation, op => {\n return nextLink.request(op, forward) || Observable.of();\n }) || Observable.of()\n );\n });\n }\n }\n\n constructor(request?: RequestHandler) {\n if (request) this.request = request;\n }\n\n public split(\n test: (op: Operation) => boolean,\n left: ApolloLink | RequestHandler,\n right?: ApolloLink | RequestHandler,\n ): ApolloLink {\n return this.concat(\n ApolloLink.split(test, left, right || new ApolloLink(passthrough))\n );\n }\n\n public concat(next: ApolloLink | RequestHandler): ApolloLink {\n return ApolloLink.concat(this, next);\n }\n\n public request(\n operation: Operation,\n forward?: NextLink,\n ): Observable<FetchResult> | null {\n throw new InvariantError('request is not implemented');\n }\n\n protected onError(\n error: any,\n observer?: Observer<FetchResult>,\n ): false | void {\n if (observer && observer.error) {\n observer.error(error);\n // Returning false indicates that observer.error does not need to be\n // called again, since it was already called (on the previous line).\n // Calling observer.error again would not cause any real problems,\n // since only the first call matters, but custom onError functions\n // might have other reasons for wanting to prevent the default\n // behavior by returning false.\n return false;\n }\n // Throw errors will be passed to observer.error.\n throw error;\n }\n\n public setOnError(fn: ApolloLink[\"onError\"]): this {\n this.onError = fn;\n return this;\n }\n}\n"]}