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Telescope 🔭


Telescope serves as the TypeScript Companion for CosmJS, used to generate developer-friendly TypeScript libraries for Cosmos blockchains. As a TypeScript transpiler for Cosmos Protobufs, akin to a "babel for the Cosmos", simply point to your protobuffer files and create full-typed libraries for teams to build dApps on your blockchain.

The following blockchain libraries (generated by Telescope) are available via npm

🎥 Checkout our video course to learn how to use telescope!

Table of contents

Quickstart

Follow the instructions below to generate a new Typescript package that you can publish to npm.

First, install telescope and create-cosmos-app

npm install -g @cosmology/telescope create-cosmos-app

Generate

Use the create-cosmos-app command to create a new package from the telescope boilerplate.

cca --boilerplate telescope

Then, you'll navigate into ./your-project/packages/telescope package for the next steps.

Add Protobufs

If you have .proto files, simply add them to a ./proto folder.

However, if you want to get started quickly using existing protos from our registry, simply use the install command.

telescope install

It's not necessary, but you may also specify specific packages, e.g.

telescope install @protobufs/osmosis

Transpile

To create the Typescript files for your chain, run the yarn codegen command inside of the package.

yarn codegen

Transpile with CLI

Less recommended, but you can also use our CLI for transpilation. To create the Typescript files with the cli, run the transpile command.

telescope transpile

You should now see some .ts files generated in ./src. These are the real source files used in your application.

Examples:

# Telescope takes chain1 folder as input,
# and generate files in 'gen/src' folder.
telescope transpile --protoDirs ../../__fixtures__/chain1 --outPath gen/src
# Telescope takes chain1 folder as input,
# and generate files in 'gen/src' folder using default telescope options.
telescope transpile --protoDirs ../../__fixtures__/chain1 --outPath gen/src --useDefaults
# Telescope takes chain1 folder(from args) and chain2 folder(from config) as input,
# and generate files in 'gen/src'(defined in the config file, will override outPath in args) folder using a config file.
# Note: --config will override --useDefaults.
telescope transpile --protoDirs ../../__fixtures__/chain1 --config .telescope.json
# Telescope takes more than one config. The config afterward will override those in front. In this case values in .telescope-ext.json will override those in .telescope.json.
telescope transpile --config .telescope.json --config .telescope-ext.json
//.telescope.json
{
  "protoDirs": [
    "../../fixtures/chain2"
  ],
  "outPath": "gen/src",
  "options": {
    // telescope options
    ...
  }
}

Build

Finally, run install and build to generate the JS and types for publishing your module to npm.

yarn build

Publishing

Now you should have code inside of your ./src folder, ready for publshing. If you used the create-cosmos-app boilerplate, use lerna to publish (and/or read the README in the boilerplate for instructions), or run npm publish from your repository.

Usage

Programatic Usage

First add telescope to your devDependencies:

yarn add --dev @cosmology/telescope

Install helpers and cosmjs dependencies listed here

import { join } from 'path';
import telescope from '@cosmology/telescope';
import { sync as rimraf } from 'rimraf';

const protoDirs = [join(__dirname, '/../proto')];
const outPath = join(__dirname, '../src');
rimraf(outPath);

telescope({
  protoDirs,
  outPath,

  // all options are totally optional ;)
  options: {
    aminoEncoding: {
        enabled: true
    },
    lcdClients: {
        enabled: false
    },
    rpcClients: {
        enabled: false,
        camelCase: true
    },

    // you can scope options to certain packages:
    packages: {
      nebula: {
        prototypes: {
          typingsFormat: {
            useExact: false
          }
        }
      },
      akash: {
        stargateClients: {
            enabled: true,
            includeCosmosDefaultTypes: false
        },
        prototypes: {
          typingsFormat: {
              useExact: false
          }
        }
      }
    }
  }
}).then(() => {
  console.log('✨ all done!');
}).catch(e => {
  console.error(e);
  process.exit(1);
})

Options

Amino Encoding

option description defaults
aminoEncoding.enabled generate amino types and amino converters true
aminoEncoding.omitEmptyTags An array of strings that determines whether a field should be omitted when serialized to JSON. If the array includes "omitempty", any field with the "omitempty" option in either gogoproto.jsontag or cosmos_proto.json_tag will be omitted. If the array includes "dont_omitempty", the field will be omitted or not based on the value of "(amino.dont_omitempty)": if it's null or false, the field will be omitted; if it's true, the field will not be omitted. ["omitempty", "dont_omitempty"]
aminoEncoding.disableMsgTypes disable generating AminoMsg types false
aminoEncoding.casingFn set the amino-casing function for a project snake()
aminoEncoding.exceptions set specific aminoType name exceptions see code
aminoEncoding.typeUrlToAmino create functions for aminoType name exceptions undefined
aminoEncoding.useLegacyInlineEncoding @deprecated. To use legacy inline encoding instead of using v2 recursive encoding false
aminoEncoding.useRecursiveV2encoding this's been removed. See useLegacyInlineEncoding instead.
aminoEncoding.legacy.useNullHandling handle null case when generating legacy amino converters(those in tx.amino.ts)
aminoEncoding.legacy.useOmitEmpty handle omit empty or not when generating legacy amino converters(those in tx.amino.ts)

Implemented Interface Options

option description defaults
interfaces.enabled enables converters convert between Any type and specific implemented interfaces. true
interfaces.useGlobalDecoderRegistry enables GlobalDecoderRegistry and related functions. Highly recommended to enable when dealing with fields with 'accepted_interface' option. Please see 'packages/telescope/tests/impl-interfaces.test.ts' for usage. false
interfaces.useUseInterfacesParams decides if add useInterfaces argument to decode and toAmino functions. false
interfaces.useByDefault decides if interface decoders are used by default (default for useInterfaces argument to decode and toAmino functions). true
interfaces.useByDefaultRpc decides if interface decoders are used by default by the RPC clients. true
interfaces.useUnionTypes Generate Any type as union types(TextProposal | RegisterIncentiveProposal) instead of intersection types(TextProposal & RegisterIncentiveProposal). false

Prototypes Options

option description defaults
prototypes.enabled enables the generation of proto encoding methods true
prototypes.includePackageVar export a protoPackage variable to indicate package name false
prototypes.includes.packages include a set of packages when transpilation. (if a package both meet include and exclude, it'll be excluded) undefined
prototypes.includes.protos include a set of proto files when transpilation. (if a proto both meet include and exclude, it'll be excluded) undefined
prototypes.excluded.packages exclude a set of packages from transpilation undefined
prototypes.excluded.protos try to exclude a set of proto files from transpilation. if files inside the list are dependencies to other files, they'll be still transpiled. undefined
prototypes.excluded.hardProtos exclude a set of proto files from transpilation. Files in this list will be excluded no matter it is a dependency to other files or not. undefined
prototypes.fieldDefaultIsOptional boolean value representing default optionality of field false
prototypes.useOptionalNullable use (gogoproto.nullable) values in determining optionality true
prototypes.allowUndefinedTypes boolean value allowing Types to be undefined false
prototypes.allowEncodeDefaultScalars boolean value allowing encoders encoding default values of scalar types. e.g. empty string, 0 or false false
prototypes.isScalarDefaultToNullable Determines whether scalar types are nullable by default when gogoproto.nullable is not specified. If set to true, scalar types will be nullable; if false, they will be required false
prototypes.enforceNullCheck Determines whether to enforce checking required scalar fields not null or undefined during encoding false
prototypes.optionalQueryParams boolean value setting queryParams to be optional false
prototypes.optionalPageRequests boolean value setting PageRequest fields to optional false
prototypes.addTypeUrlToDecoders add $typeUrl field to generated interfaces true
prototypes.addAminoTypeToObjects add aminoType field to generated Decoders false
prototypes.addTypeUrlToObjects add typeUrl field to generated Decoders true
prototypes.enableRegistryLoader generate Registry loader to *.registry.ts files true
prototypes.enableMessageComposer generate MessageComposer to *.registry.ts files true
prototypes.patch An object mapping filenames to an array of Operation to be applied as patches to proto files during generation. See JSON Patch Protos undefined

Prototypes Methods

option description defaults
prototypes.methods.encode boolean to enable encode method on proto objects true
prototypes.methods.decode boolean to enable decode method on proto objects true
prototypes.methods.fromJSON boolean to enable fromJSON method on proto objects true
prototypes.methods.toJSON boolean to enable toJSON method on proto objects true
prototypes.methods.fromPartial boolean to enable fromPartial method on proto objects true
prototypes.methods.fromSDK boolean to enable fromSDK method on proto objects false
prototypes.methods.toSDK boolean to enable toSDK method on proto objects false

Enums Options

option description defaults
enums.useCustomNames Enables the usage of custom names for enums if specified through proto options or annotations, allowing for more descriptive or project-specific naming conventions. false

LCD Client Options

option description defaults
lcdClients.enabled generate LCD clients that can query proto Query messages true
lcdClients.bundle will generate factory bundle aggregate of all LCD Clients true
lcdClients.scoped will generate factory of scoped LCD Clients undefined
lcdClients.scopedIsExclusive will allow both scoped bundles and all RPC Clients true

See LCD Clients for more info.

RPC Client Options

option description defaults
rpcClients.type will generate this type of RPC client (tendermint, gRPC-web, gRPC) tendermint
rpcClients.enabled generate RPC clients that can interact with proto messages true
rpcClients.bundle will generate factory bundle aggregate of all RPC Clients true
rpcClients.camelCase use camel-case for RPC methods when generating RPC clients true
rpcClients.scoped will generate factory of scoped RPC Clients undefined
rpcClients.scopedIsExclusive will allow both scoped bundles and all RPC Clients true
rpcClients.enabledServices which services to enable [Msg,Query,Service]
rpcClients.instantOps will generate instant rpc operations in the file service-ops.ts under root folder, which contains customized classes having selected rpc methods undefined
rpcClients.serviceImplement assign implement type of rpc methods, Query or Tx, by setting patterns under service types. undefined

See RPC Clients for more info.

Helper Functions

Option Description Defaults
helperFuncCreators.enabled Enable the generation of helper function files .func.ts false
helperFuncCreators.genCustomHooks Generates React hooks alongside helper functions false
helperFuncCreators.include.serviceTypes Specifies which types of services to include (Query, Msg). undefined includes all types. undefined
helperFuncCreators.include.patterns Array of glob patterns patterns (e.g., "**", "cosmos.bank.v1beta1.bala*", etc.) to match specific proto services. undefined
helperFuncCreators.nameMappers Configuration object for customizing function names and prefixes {}
helperFuncCreators.nameMappers.All.funcBody Maps method names to a new name for all services. "unchanged"
helperFuncCreators.nameMappers.All.creatorPrefix Prefix for the function creator. "create"
helperFuncCreators.nameMappers.All.hookPrefix Prefix for the hooks. "use"
helperFuncCreators.nameMappers.Query.funcBody Maps method names to a new name for Query services. "get"
helperFuncCreators.nameMappers.Query.creatorPrefix Prefix for the function creator for Query services. "create"
helperFuncCreators.nameMappers.Query.hookPrefix Prefix for the hooks for Query services. "use"
helperFuncCreators.nameMappers.Msg.funcBody Maps method names to a new name for Msg services. "unchanged"
helperFuncCreators.nameMappers.Msg.creatorPrefix Prefix for the function creator for Msg services. "create"
helperFuncCreators.nameMappers.Msg.hookPrefix Prefix for the hooks for Msg services. "use"

See Helper Functions Configuration for more info.

Stargate Client Options

option description defaults
stargateClients.includeCosmosDefaultTypes if true, will include the cosmjs defaults with stargate clients true (except cosmos package)
stargateClients.addGetTxRpc if true, will add getSigningTxRpc to clients in namespaces false

State Management

React Query

option description defaults
reactQuery.enabled if true, will create react hooks that use @tanstack/react-query hooks false
reactQuery.needExtraQueryKey if true, users can input extra react query key to some customized hooks. e.g.['rpcEndpoint', 'yourExtraKey'] false
reactQuery.include.protos if set, will create the hooks on matched proto filenames or patterns using minimatch []
reactQuery.include.packages if set, will create the hooks on matched packages files using minimatch []
reactQuery.include.patterns if set, will create the hooks on matched patterns of files using minimatch(deprecated in favor of packages and protos have been supported minimatch) []
reactQuery.instantExport.include.patterns if set, will expose instant hooks on matched patterns of packages + method(e.g. cosmos.bank.v1beta1.useBalance) using minimatch. If there're duplicated method names in multiple packages without setting reactQuery.instantExport.nameMapping, one duplicated name will created like: useCosmosBankV1beta1Balance []
reactQuery.instantExport.nameMapping map an alias to a package + method in case of better naming of duplicated method names. (e.g. useBankBalance: cosmos.bank.v1beta1.useBalance) Customized hook name is set in front of pkg+method, by doing this we can prevent duplicate alias. {}

Mobx

option description defaults
mobx.enabled if true, will create mobx stores that use mobx false
mobx.include.protos if set, will create the mobx stores on matched proto filenames or patterns using minimatch []
mobx.include.packages if set, will create the mobx stores on matched packages files using minimatch []
mobx.include.patterns if set, will create the mobx stores on matched patterns of proto files using minimatch(deprecated in favor of packages and protos have been supported minimatch) []

Pinia

option description defaults
pinia.enabled if true, will create pinia stores that use pinia false
mobx.include.protos if set, will create the pinia stores on matched proto filenames or patterns using minimatch []
mobx.include.packages if set, will create the pinia stores on matched packages files using minimatch []
mobx.include.patterns if set, will create the pinia stores on matched patterns of proto files using minimatch(deprecated in favor of packages and protos have been supported minimatch) []

Typings and Formating

option description defaults
prototypes.typingsFormat.customTypes.useCosmosSDKDec enable handling "prototypes.typingsFormat.customTypes.useCosmosSDKDec" proto custom type. Used to show decimal fields with the custom type correctly. Highly recommend set to true. true
prototypes.typingsFormat.customTypes.useEnhancedDecimal To use patched decimal other then decimal from @cosmjs/math false
prototypes.typingsFormat.customTypes.base64Lib To use endo/base64 methods undefined
prototypes.typingsFormat.num64 'long' or 'bigint', the way of generating int64 proto types, set to 'bigint' to enable using more stable built-in type bigint
prototypes.typingsFormat.useTelescopeGeneratedType Discard GeneratedType from cosmjs, use TelescopeGeneratedType instead inside *.registry.ts files false
prototypes.typingsFormat.useDeepPartial defaults to true, but if disabled uses the Partial TS type false
prototypes.typingsFormat.useExact defaults to false, but if enabled uses the Exact TS type false
prototypes.typingsFormat.toJsonUnknown defaults to true, but if disabled uses the JsonSafe for toJSON methods true
prototypes.typingsFormat.timestamp use either date or timestamp for Timestamp proto type "date"
prototypes.typingsFormat.duration use either duration or string for Duration proto type "duration"
prototypes.typingsFormat.setDefaultEnumToUnrecognized false: enum empty value would be 0, true: -1(value for enum unrecognized) true
prototypes.typingsFormat.setDefaultCustomTypesToUndefined true: Timestamp,Duration,Any,Coin empty value would be undefined., false: using fromPartial to get an empty obj false
prototypes.typingsFormat.autoFixUndefinedEnumDefault the default value of an enum field would be: 1(proto2); 0(proto3); But in some rare cases, those default values are not existing. By enabling this, the default value will be automatically fixed with the smallest value inside the enum. false

Protobuf parser

option description defaults
prototypes.parser.keepCase passes keepCase to protobuf parse() to keep original casing true
prototypes.parser.alternateCommentMode passes alternateCommentMode to protobuf parse() method true
prototypes.parser.preferTrailingComment passes preferTrailingComment to protobuf parse() method false

Typescript Disabling

option description defaults
tsDisable.disableAll if true, will include //@ts-nocheck on every output file false
tsDisable.patterns if set, will include //@ts-nocheck on matched patterns []
tsDisable.files if set, will include //@ts-nocheck on matched files []

ESLint Disabling

option description defaults
eslintDisable.disableAll if true, will include /* eslint-disable */ on every output file false
eslintDisable.patterns if set, will include /* eslint-disable */ on matched patterns []
eslintDisable.files if set, will include /* eslint-disable */ on matched files []

Bundle

option description defaults
bundle.enabled bundle all files into a scoped index file true

Output

option description defaults
env 'default' or 'v-next', set to 'v-next' to enable yet to release features default
removeUnusedImports removes unused imports true
classesUseArrowFunctions classes use arrow functions instead of bind()ing in constructors false
includeExternalHelpers exports a few helpers functions in extern.ts false
restoreImportExtension restore extensions of imported paths. e.g: '.js'. null means no ext null

Types

Timestamp

The representation of google.protobuf.Timestamp is configurable by the prototypes.typingsFormat.timestamp option.

Protobuf type Default/date='date' date='timestamp'
google.protobuf.Timestamp Date { seconds: Long, nanos: number }

TODO

  • add date='string' option

Duration

The representation of google.protobuf.Duration is configurable by the prototypes.typingsFormat.duration option.

Protobuf type Default/duration='duration' duration='string'
google.protobuf.Duration { seconds: Long, nanos: number } string

Composing Messages

This example shows messages from the osmojs, which was built with Telescope.

Import the osmosis object from osmojs. In this case, we're show the messages available from the osmosis.gamm.v1beta1 module:

import { osmosis } from 'osmojs';

const {
    joinPool,
    exitPool,
    exitSwapExternAmountOut,
    exitSwapShareAmountIn,
    joinSwapExternAmountIn,
    joinSwapShareAmountOut,
    swapExactAmountIn,
    swapExactAmountOut
} = osmosis.gamm.v1beta1.MessageComposer.withTypeUrl;

Now you can construct messages. If you use vscode or another typescript-enabled IDE, you should also be able to use ctrl+space to see auto-completion of the fields required for the message.

import { coin } from '@cosmjs/amino';

const msg = swapExactAmountIn({
  sender,
  routes,
  tokenIn: coin(amount, denom),
  tokenOutMinAmount
});

Calculating Fees

Make sure to create a fee object in addition to your message.

import { coins } from '@cosmjs/amino';

const fee = {
    amount: coins(0, 'uosmo'),
    gas: '250000'
}

if you are broadcasting multiple messages in a batch, you should simulate your tx and estimate the fee

import { Dec, IntPretty } from '@keplr-wallet/unit';

const gasEstimated = await stargateClient.simulate(address, msgs, memo);
const fee = {
  amount: coins(0, 'uosmo'),
  gas: new IntPretty(new Dec(gasEstimated).mul(new Dec(1.3)))
    .maxDecimals(0)
    .locale(false)
    .toString()
};

Stargate Clients

Every module gets their own signing client. This example demonstrates for the osmosis module.

Use getSigningOsmosisClient to get your SigningStargateClient, with the Osmosis proto/amino messages full-loaded. No need to manually add amino types, just require and initialize the client:

import { getSigningOsmosisClient } from 'osmojs';

const client = await getSigningOsmosisClient({
  rpcEndpoint,
  signer // OfflineSigner
});

Creating Signers

To broadcast messages, you'll want to use either keplr or an OfflineSigner from cosmjs using mnemonics.

Amino Signer

Likely you'll want to use the Amino, so unless you need proto, you should use this one:

import { getOfflineSigner as getOfflineSignerAmino } from 'cosmjs-utils';

Proto Signer

import { getOfflineSigner as getOfflineSignerProto } from 'cosmjs-utils';

WARNING: NOT RECOMMENDED TO USE PLAIN-TEXT MNEMONICS. Please take care of your security and use best practices such as AES encryption and/or methods from 12factor applications.

import { chains } from 'chain-registry';

const mnemonic =
    'unfold client turtle either pilot stock floor glow toward bullet car science';
const chain = chains.find(({ chain_name }) => chain_name === 'osmosis');
const signer = await getOfflineSigner({
    mnemonic,
    chain
});

Broadcasting messages

Now that you have your client, you can broadcast messages:

import { signAndBroadcast } from '@osmosnauts/helpers';

const res = await signAndBroadcast({
  client, // SigningStargateClient
  chainId: 'osmosis-1', // use 'osmo-test-4' for testnet
  address,
  msgs: [msg],
  fee,
  memo: ''
});

LCD Clients

For querying data via REST endpoints, you can use LCD Clients. For a better developer experience, you can generate a factory of scoped bundles of all LCD Clients with the lcdClients option.

const options: TelescopeOptions = {
    lcdClients: {
        enabled: true,
    },
};

If you use the lcdClients.scoped array, you can scope to only the modules of your interest.

const options: TelescopeOptions = {
  lcdClients: {
    enabled: true,
    scoped: [
      {
        dir: 'osmosis',
        filename: 'custom-lcd-client.ts',
        packages: [
          'cosmos.bank.v1beta1',
          'cosmos.gov.v1beta1',
          'osmosis.gamm.v1beta1'
        ],
        addToBundle: true,
        methodName: 'createCustomLCDClient'
      },
      {
        dir: 'evmos',
        filename: 'custom-lcd-client.ts',
        packages: [
          'cosmos.bank.v1beta1',
          'cosmos.gov.v1beta1',
          'evmos.erc20.v1'
        ],
        addToBundle: true,
        methodName: 'createEvmosLCDClient'
      }
    ]
  }
};

This will generate a nice helper in the ClientFactory, which you can then use to query multiple modules from a single object:

import { osmosis } from './codegen';

const main = async () => {
   const client = await osmosis.ClientFactory.createLCDClient({ restEndpoint: REST_ENDPOINT });

   // now you can query the modules
   const pool = await client.osmosis.gamm.v1beta1.pool({ poolId: "1" });
   const balance = await client.cosmos.bank.v1beta1.allBalances({ address: 'osmo1addresshere' });
};

LCD Clients Classes

If you want to instantiate a single client, for any module that has a Query type, there will be a LCDQueryClient object:

import { osmosis } from "osmojs";

export const main = async () => {
    const requestClient = new LCDClient({ restEndpoint: REST_ENDPOINT });
    const client = new osmosis.gamm.v1beta1.LCDQueryClient({ requestClient });
    const pools = await client.pools();
    console.log(pools);
};

main().then(() => {
    console.log('all done')
})

RPC Clients

Tendermint Client

For querying data via RPC endpoints, you can use RPC Clients. For a better developer experience, you can generate a factory of scoped bundles of all RPC Clients with the rpcClients option.

const options: TelescopeOptions = {
  rpcClients: {
    type: 'tendermint',
    enabled: true,
    camelCase: true
  }
};

If you use the rpcClients.scoped array, you can scope to only the modules of your interest. gRPC-web and gRPC-gateway work the same way with this option.

const options: TelescopeOptions = {
  rpcClients: {
    enabled: true,
    camelCase: true,
    scoped: [
      {
        dir: 'osmosis',
        filename: 'osmosis-rpc-client.ts',
        packages: [
          'cosmos.bank.v1beta1',
          'cosmos.gov.v1beta1',
          'osmosis.gamm.v1beta1'
        ],
        addToBundle: true,
        methodNameQuery: 'createRPCQueryClient',
        methodNameTx: 'createRPCTxClient'
      }
    ]
  }
};

This will generate helpers createRPCQueryClient and createRPCTxClient in the ClientFactory, which you can then use to query multiple modules from a single object:

import { osmosis } from './codegen';

const main = async () => {
  const client = await osmosis.ClientFactory.createRPCQueryClient({ rpcEndpoint });

  // now you can query the modules
  const pool = await client.osmosis.gamm.v1beta1.pool({ poolId: "1" });
  const balance = await client.cosmos.bank.v1beta1.allBalances({ address: 'osmo1addresshere' });
};

gRPC-web Client

For querying data via gRPC-web endpoints, you can use gRPC-web Clients. For a better developer experience, you can generate a factory of scoped bundles of all gRPC-web Clients with the rpcClients option.

const options: TelescopeOptions = {
  rpcClients: {
    type: 'grpc-web',
    enabled: true,
    camelCase: true
  }
};

This will generate helpers createGrpcWebClient and createGrpcMsgClient in the ClientFactory, which you can then use to query multiple modules from a single object, if you need an example with scaffold and broadcast msg you can refer to the example below in grpc-gateway:

import { osmosis } from './codegen';

const main = async () => {
  const client = await osmosis.ClientFactory.createGrpcWebClient({ endpoint });

  // now you can query the modules
  const pool = await client.osmosis.gamm.v1beta1.pool({ poolId: "1" });
  const balance = await client.cosmos.bank.v1beta1.allBalances({ address: 'osmo1addresshere' });
};

gRPC-gateway Client

For querying data via gRPC-web endpoints, you can use gRPC-web Clients. For a better developer experience, you can generate a factory of scoped bundles of all gRPC-web Clients with the rpcClients option.

const options: TelescopeOptions = {
  rpcClients: {
    type: 'grpc-gateway',
    enabled: true,
    camelCase: true
  }
};

This will generate helpers createGrpcGateWayClient in the ClientFactory, which you can then use to query multiple modules from a single object:

import { osmosis } from './codegen';

const main = async () => {
  // endpoint here is lcd endpoint
  const client = await osmosis.ClientFactory.createGrpcGateWayClient({ endpoint });

  // now you can query the modules
  const pool = await client.osmosis.gamm.v1beta1.pool({ poolId: "1" });
  const balance = await client.cosmos.bank.v1beta1.allBalances({ address: 'osmo1addresshere' });
};

Below will be an example of scaffold a grant Proto Msg for grpc-web and grpc-gateway and then broadcast it.

const { grant } = cosmos.authz.v1beta1.MessageComposer.withTypeUrl;
const msg = grant({
    granter: 'granter_address',
    grantee: 'grantee_address',
    grant: {
        authorization: StakeAuthorization.toProtoMsg({
        maxTokens: {
            denom: 'uosmo',
            amount: '100000000'
        },
        authorizationType: AuthorizationType.AUTHORIZATION_TYPE_DELEGATE
    }),
    expiration: new Date(Date.now() + 60 * 60 * 24 * 7)
}})

const signed_tx = await signClient.sign('granter_address', [msg], fee, 'telescope: grant', signerData);
const txRawBytes = Uint8Array.from(TxRaw.encode(signed_tx).finish());

const res = await client.cosmos.tx.v1beta1.broadcastTx({
    txBytes: txRawBytes,
    mode: BroadcastMode.BROADCAST_MODE_BLOCK
})

console.log(res);

RPC Client Classes

If you want to instantiate a single client, you can generate RPC classes with the rpcClients option;

For any module that has a Msg, Query or Service type, a

import { osmosis, cosmos } from 'osmojs';

const MsgClient = osmosis.gamm.v1beta1.MsgClientImpl;
const QueryClient = osmosis.gamm.v1beta1.QueryClientImpl;
const ServiceClient = cosmos.base.tendermint.v1beta1.ServiceClientImpl;

Here is an example of making a query if you want to use the RPC client classes manually:

import { osmosis } from "osmojs";
import { createProtobufRpcClient, QueryClient } from "@cosmjs/stargate";
import { Tendermint34Client } from "@cosmjs/tendermint-rpc";

export const main = async () => {
    const tmClient = await Tendermint34Client.connect(RPC_ENDPOINT);
    const QueryClientImpl = osmosis.gamm.v1beta1.QueryClientImpl;
    const client = new QueryClient(tmClient);
    const rpc = createProtobufRpcClient(client);
    const queryService = new QueryClientImpl(rpc);
    const pools = await queryService.pools({})
    console.log(pools);
};

main().then(() => {
    console.log('all done')
})

Instant RPC Methods

Using instantOps option to expose instant RPC methods.

For example, for this config:

{
    instantOps: [
      {
        className: "OsmosisClaim",
        include: {
          patterns: ["osmosis.**.*claim*"],
        },
      },
      {
        className: "CosmosAuthAccount",
        include: {
          patterns: [
            "cosmos.auth.**.*account*",
            "cosmos.auth.**.*Account*",
            "cosmos.gov.v1beta1.**",
          ],
        },
        nameMapping: {
          // name mapping rule for both Msg and Query methods.
          // moduleAccounts will be renamed to authModuleAccounts in generated class.
          All: {
            authModuleAccounts: "cosmos.auth.v1beta1.moduleAccounts",
          },
          // name mapping rule for Msg methods.
          Msg: {
            // deposit method under Msg will be renamed to txDeposit in generated class. While deposit method under Query will remain the same.
            txDeposit: "cosmos.gov.v1beta1.deposit",
            // Same for vote method.
            txVote: "cosmos.gov.v1beta1.vote",
          },
        },
      },
    ],
}

There'll be an extra file generated in the root folder called service-ops.ts:

export interface OsmosisClaim extends _OsmosisClaimV1beta1Queryrpc.OsmosisClaim {}
export class OsmosisClaim {
  rpc: TxRpc;
  init(rpc: TxRpc) {
    this.rpc = rpc;
    this.claimRecord = _OsmosisClaimV1beta1Queryrpc.createClientImpl(rpc).claimRecord;
    this.claimableForAction = _OsmosisClaimV1beta1Queryrpc.createClientImpl(rpc).claimableForAction;
  }
}
export interface CosmosAuthAccount extends _CosmosAuthV1beta1Queryrpc.CosmosAuthAccount, _CosmosGovV1beta1Queryrpc.CosmosAuthAccount, _CosmosGovV1beta1Txrpc.CosmosAuthAccount {}
export class CosmosAuthAccount {
  rpc: TxRpc;
  init(rpc: TxRpc) {
    this.rpc = rpc;
    this.accounts = _CosmosAuthV1beta1Queryrpc.createClientImpl(rpc).accounts;
    this.account = _CosmosAuthV1beta1Queryrpc.createClientImpl(rpc).account;

    // moduleAccounts has been renamed to authModuleAccounts as the nameMapping in settings.
    this.authModuleAccounts = _CosmosAuthV1beta1Queryrpc.createClientImpl(rpc).moduleAccounts;

    this.proposal = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).proposal;
    this.proposals = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).proposals;

    // vote under Query remains the same.
    this.vote = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).vote;

    this.votes = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).votes;
    this.params = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).params;

    // deposit under Query remains the same.
    this.deposit = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).deposit;

    this.deposits = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).deposits;
    this.tallyResult = _CosmosGovV1beta1Queryrpc.createClientImpl(rpc).tallyResult;
    this.submitProposal = _CosmosGovV1beta1Txrpc.createClientImpl(rpc).submitProposal;

    //same as txDeposite for vote here.
    this.txVote = _CosmosGovV1beta1Txrpc.createClientImpl(rpc).vote;

    this.voteWeighted = _CosmosGovV1beta1Txrpc.createClientImpl(rpc).voteWeighted;

    // deposit method under Msg will be renamed to txDeposit in generated class. While deposit method under Query will remain the same.
    this.txDeposit = _CosmosGovV1beta1Txrpc.createClientImpl(rpc).deposit;
  }
}

Manually registering types

This example is with osmosis module in osmojs, but it is the same pattern for any module.

NOTE: this is using @cosmjs/stargate@0.28.4

import {
    AminoTypes,
    SigningStargateClient
} from '@cosmjs/stargate';
import { Registry } from '@cosmjs/proto-signing';
import { defaultRegistryTypes } from '@cosmjs/stargate';
import { OfflineSigner } from '@cosmjs/proto-signing'
import { osmosis } from 'osmojs';

export const getCustomSigningClient = async ({ rpcEndpoint, signer }: { rpcEndpoint: string, signer: OfflineSigner }) => {
  // registry
  const registry = new Registry(defaultRegistryTypes);

  // aminotypes
  const aminoTypes = new AminoTypes({
    ...osmosis.gamm.v1beta1.AminoConverter,
    ...osmosis.lockup.AminoConverter,
    ...osmosis.superfluid.AminoConverter
  });

  // load the
  osmosis.gamm.v1beta1.load(registry);
  osmosis.lockup.load(registry);
  osmosis.superfluid.load(registry);

  const client = await SigningStargateClient.connectWithSigner(
    rpcEndpoint,
    signer,
    { registry, aminoTypes }
  );

  return client;
};

JSON Patch Protos

The prototypes.patch configuration within the options object allows for dynamic modifications to protobuf definitions during code generation. This feature is designed to apply specific changes to proto files without altering the original source. By using JSON Patch operations such as replace and add, developers can customize the generated output to better fit project requirements when upstream SDK PRs are lagging or not in production.

Patches are specified as arrays of Operations, where each operation is defined by:

  • op: The operation type (add or replace).
  • path: The JSON path to the target field, optionally prefixed with @ to denote paths derived automatically from the package name, simplifying navigation within the proto file's structure.
  • value: The new value to be set at the target location specified by the path.

Here is how these patches can be defined within the prototypes configuration:

{
    "prototypes": {
        "patch": {
            "cosmwasm/wasm/v1/types.proto": [
                {
                    "op": "replace",
                    "path": "@/AccessType/valuesOptions/ACCESS_TYPE_UNSPECIFIED/(gogoproto.enumvalue_customname)",
                    "value": "UnspecifiedAccess"
                },
                {
                    "op": "replace",
                    "path": "@/AccessType/valuesOptions/ACCESS_TYPE_NOBODY/(gogoproto.enumvalue_customname)",
                    "value": "NobodyAccess"
                },
                {
                    "op": "add",
                    "path": "@/AccessType/values/ACCESS_TYPE_SUPER_FUN",
                    "value": 4
                },
                {
                    "op": "add",
                    "path": "@/AccessType/valuesOptions/ACCESS_TYPE_SUPER_FUN",
                    "value": {
                        "(gogoproto.enumvalue_customname)": "SuperFunAccessType"
                    }
                }
            ]
        }
    }
}

CosmWasm

Generate TypeScript SDKs for your CosmWasm smart contracts by using the cosmwasm option on TelescopeOptions. The cosmwasm option is actually a direct reference to the TSBuilderInput object, for the most up-to-date documentation, visit @cosmwasm/ts-codegen.

import { TSBuilderInput } from '@cosmwasm/ts-codegen';
const options: TelescopeOptions = {
  cosmwasm: {
    contracts: [
      {
        name: 'SG721',
        dir: './path/to/sg721/schema'
      },
      {
        name: 'Minter',
        dir: './path/to/Minter/schema'
      }
    ],
    outPath: './path/to/code/src/'
  }
};

Helper Functions Configuration

The nameMappers object supports three service types: All, Query, and Msg. Each pattern within these categories can specify:

{
  "pattern": {
    funcBody: (name: string) => string,    // Function to transform the method name
    creatorPrefix?: string,                // Prefix for the creator function (default: "create")
    hookPrefix?: string                    // Prefix for the hook function (default: "use")
  }
}
const options: TelescopeOptions = {
  helperFuncCreators: {
    enabled: true,
    genCustomHooks: true,
    include: {
      patterns: ["cosmos.gov.v1beta1.**", "cosmos.bank.v1beta1.*Send*"],
    },
    nameMappers: {
      All: {
        "cosmos.gov.v1beta1.*Vote*": {
          funcBody: (name) => `helper${name}`,
          creatorPrefix: "build",
          hookPrefix: "use",
        },
      },
      Query: {
        "cosmos.gov.v1beta1.*Deposits*": {
          funcBody: (name) => `goOver${name}`,
        },
      },
      Msg: {
        "cosmos.gov.v1beta1.*VoteWeighted*": {
          funcBody: (name) => `lets${name}`,
          creatorPrefix: "construct",
          hookPrefix: "useTx",
        },
      },
    },
  },
};

Pattern Matching Priority:

  1. Service-specific patterns (Query, Msg) take precedence over All patterns
  2. More specific patterns take precedence over general patterns
  3. Patterns are case-sensitive

Generated Output Examples:

  • For a method named VoteWeighted:
  • Default: createVoteWeighted and useVoteWeighted
  • With custom mapping: constructLetsVoteWeighted and useTxLetsVoteWeighted

Notes:

  • Patterns support glob-style matching (e.g., **, *)
  • Each service type can have its own naming conventions
  • Custom prefixes are optional; defaults will be used if not specified
  • Function body transformations can be customized using the funcBody property

Dependencies

If you don't use the boilerplate, you will need to manually install

  • @cosmjs/amino
  • @cosmjs/proto-signing
  • @cosmjs/stargate
  • @cosmjs/tendermint-rpc
yarn add @cosmjs/amino @cosmjs/proto-signing @cosmjs/stargate @cosmjs/tendermint-rpc

If you use the LCD Client generation, you'll need to add

  • @cosmology/lcd
yarn add @cosmology/lcd

Troubleshooting

Create React App

CRA requires that you update Webpack configurations:

https://github.com/cosmos/cosmjs/blob/656e02374898afe755e980e93390591b4b65fd86/README.md#webpack-configs

Here is an example of a config-overrides.js:

https://github.com/pyramation/osmosis-ui/blob/main/config-overrides.js

Babel

This should not be an issue, but if you experience problems with syntax or are not using preset-env, you may need these babel plugins:

Developing

See our documentation for how to contribute and develop Telescope.

Sponsors

Kudos to our sponsors:

  • Osmosis funded the creation of Telescope.

Related

Checkout these related projects:

  • @cosmology/telescope Your Frontend Companion for Building with TypeScript with Cosmos SDK Modules.
  • @cosmwasm/ts-codegen Convert your CosmWasm smart contracts into dev-friendly TypeScript classes.
  • chain-registry Everything from token symbols, logos, and IBC denominations for all assets you want to support in your application.
  • cosmos-kit Experience the convenience of connecting with a variety of web3 wallets through a single, streamlined interface.
  • create-cosmos-app Set up a modern Cosmos app by running one command.
  • interchain-ui The Interchain Design System, empowering developers with a flexible, easy-to-use UI kit.
  • starship Unified Testing and Development for the Interchain.

Credits

🛠 Built by Cosmology — if you like our tools, please consider delegating to our validator ⚛️

Thanks to these engineers, teams and projects for inspiring Telescope:

Disclaimer

AS DESCRIBED IN THE TELESCOPE LICENSES, THE SOFTWARE IS PROVIDED “AS IS”, AT YOUR OWN RISK, AND WITHOUT WARRANTIES OF ANY KIND.

No developer or entity involved in creating Telescope will be liable for any claims or damages whatsoever associated with your use, inability to use, or your interaction with other users of the Telescope code or Telescope CLI, including any direct, indirect, incidental, special, exemplary, punitive or consequential damages, or loss of profits, cryptocurrencies, tokens, or anything else of value.

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A TypeScript Transpiler for Cosmos Protobufs ⚛️

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